MOLECULAR BIOSYSTEMS INC
10-K405, 1998-06-26
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
                                   FORM 10-K
 
(Mark One)
   [X]          Annual Report Pursuant to Section 13 or 15(d) of
                      the Securities Exchange Act of 1934
 
                    FOR THE FISCAL YEAR ENDED MARCH 31, 1998
 
   [ ]         Transaction Report Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934
 
                         Commission file number 0-12648
 
                           MOLECULAR BIOSYSTEMS, INC.
 
             (Exact name of registrant as specified in its charter)
 
               DELAWARE                                 36-3078632
   (State or other jurisdiction of                   (I.R.S. Employer
    incorporation or organization)                 Identification No.)
 
             10070 Barnes Canyon Road, San Diego, California 92121
              (Address of principal executive offices) (Zip Code)
 
       Registrant's telephone number, including area code: (619) 452-0681
 
          Securities registered pursuant to Section 12(b) of the Act:
 
         Title of each class                  Name of each exchange on which
     Common Stock, $.01 par value                       registered
                                                 New York Stock Exchange
 
          Securities registered pursuant to Section 12(g) of the Act:
                                      None
 
    Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X] No [  ]
 
    Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.  [X]
 
    The aggregate market value of voting stock held by non-affiliates of the
registrant was $136,975,838 as of June 16, 1998 (computed by reference to the
last sale price of a share of the registrant's Common Stock on that date as
reported on the New York Stock Exchange).
 
    There were 18,572,995 shares outstanding of the registrant's Common Stock as
of June 16, 1998.
 
DOCUMENTS INCORPORATED BY REFERENCE
 
    Information required by Items 10, 11, 12 and 13 of this Report is
incorporated by reference to the registrant's definitive proxy statement for the
1998 Annual Meeting of Stockholders to be held August 13, 1998.
 
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                                       PART I

ITEM 1.        BUSINESS

  THE FOLLOWING DISCUSSION CONTAINS FORWARD-LOOKING STATEMENTS THAT INVOLVE
RISKS AND UNCERTAINTIES. THE COMPANY'S ACTUAL RESULTS COULD DIFFER MATERIALLY
FROM THOSE DISCUSSED HERE. FACTORS THAT COULD CAUSE OR CONTRIBUTE TO SUCH
DIFFERENCES INCLUDE, BUT ARE NOT LIMITED TO, THOSE DISCUSSED IN THIS ITEM AND IN
ITEM 7, "MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS."

GENERAL

  Molecular Biosystems, Inc. ("MBI" or the "Company") is a leader in the
development, manufacture and sale of ultrasound contrast imaging agents. These
contrast agents are used primarily to improve the real-time images ("moving
pictures") of organs and body structures, especially the heart, obtained through
ultrasound examinations. MBI's products are designed to increase the diagnostic
usefulness of ultrasound examinations through enhanced visualization of
structures and vasculature, and to reduce the need for diagnostic procedures
that may be more expensive, time-consuming, or invasive.  MBI is the first and
only company to obtain marketing approval from the United States Food and Drug
Administration ("FDA") for ultrasound contrast agents, having gained approvals
for ALBUNEX-Registered Trademark-_in 1994 and for OPTISON-TM- (the Company's
second-generation agent) in 1997.  OPTISON, a significant improvement over
ALBUNEX in terms of efficacy, is used to detect heart disease by assessing blood
flow within the heart chambers and by identifying the location of the chamber
borders and the movement of the chamber walls ("cardiac function").
 
  To increase the potential applications of OPTISON, MBI has conducted Phase 2
clinical trials to evaluate the product's efficacy in determining whether the
heart muscle is receiving an adequate blood supply ("myocardial perfusion"). 
The multiple Phase 2 trials include use of OPTISON in the emergency room for
patients presenting with chest pain, and in various forms of stress
echocardiography.  Results using OPTISON in each of these applications suggest a
close agreement with nuclear SPECT imaging for the detection of ischemia by wall
motion and perfusion.  Furthermore, the results indicate that use of OPTISON
could help to "rescue" a large proportion of uninterpretable non-contrast
studies, thereby reducing the need for additional, more expensive and time
consuming testing.  The Company believes the information regarding perfusion
will enable cardiologists to diagnose heart attacks and coronary artery disease
more accurately and safely than is currently feasible.  MBI is also conducting
Phase 2 clinical studies using OPTISON to detect abnormalities in other organs,
such as the liver.

  Ultrasound imaging is a widely-used and cost-effective technique to examine 
soft tissues, internal body organs and blood flow.  Ultrasound systems use 
low-power, high-frequency sound waves that are reflected by tissues and 
fluids to produce real-time images.  It is estimated that over 54 million 
ultrasound imaging procedures were performed in the United States in 1997, of 
which approximately 15 million procedures were used to examine the heart 
("echocardiograms"). Unlike other imaging modalities, such as magnetic 
resonance imaging, computed tomography and nuclear imaging, ultrasound 
imaging procedures could not be performed with contrast agents to enhance 
images until the approval of ALBUNEX and the subsequent approval of OPTISON.  
Non-contrast ultrasound, while very good in delineating anatomy, often 
results in poor image quality and is unable to demonstrate actual blood flow 
within organ tissue.

  MBI's ultrasound contrast agents are designed to enhance existing 
ultrasound procedures by improving their ability to image blood flow and by 
providing clearer images of body structures and organs.  OPTISON and ALBUNEX 
consist of human albumin microspheres made using MBI's patented process.  The 
microspheres are injected intravenously into the bloodstream and transported 
to the heart and other organs.  Because the microspheres are highly 
reflective to the ultrasound xbeam, organs and structures containing blood 
will appear more brightly and clearly than they would in the absence of the 
contrast agent.  Albumin is a protein naturally found in human blood and has 
been used for many years as a blood expander. Both ALBUNEX, which was first 
marketed in Japan in October 1993, and OPTISON, marketed since January 1998, 
have been given to over 30,000 patients with no clinically significant side 
effects.


                                       2

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  OPTISON permits cardiologists to see blood flow in the chambers of the 
heart and the motion of the heart muscle using ultrasound.  Cardiologists are 
particularly interested in the chamber of the heart called the left ventricle 
which pumps oxygenated blood arriving from the lungs to all other parts of 
the body.  In approximately 15-20% of patients undergoing an echocardiogram, 
the wall of the left ventricle (the "endocardial border") cannot be detected 
or its location appears ambiguous on the ultrasound image based on the 
physical and disease condition of the patient.  When OPTISON enters the left 
ventricle, however, the endocardial border can be visualized because of the 
reflectivity of the OPTISON microspheres in the blood.  When the endocardial 
border is visible, cardiologists can observe its motion and thus are able to 
interpret cardiac function, which is critical in diagnosing cardiac disease, 
including damage from a heart attack.

  In addition to other indications, OPTISON is designed to permit 
cardiologists to evaluate myocardial perfusion. Unlike ALBUNEX, which is 
air-filled, OPTISON microspheres contain an insoluble gas, fluoropropane. 
Because of their composition, OPTISON microspheres remain in the bloodstream 
for more than 5 minutes, as opposed to 35-40 seconds in the case of ALBUNEX. 
As a result, OPTISON is able to perfuse into tissues, including the heart 
muscle, highlighting areas of normal and abnormal blood flow. The Company 
believes that if its clinical trials for myocardial perfusion are successful, 
OPTISON will provide important diagnostic benefits, including detecting areas 
of the heart muscle compromised due to coronary artery stenosis as well as 
detecting the lack of blood flow in the heart muscle resulting from a 
complete occlusion of a coronary artery (heart attack). The Company believes 
that OPTISON may have much greater market potential than ALBUNEX because of 
the greater diagnostic importance of the indications for which it may be 
suitable (such as myocardial perfusion) when used in conjunction with new 
ultrasound imaging modalities.

  In June 1998, the Company announced that results from Phase 2 myocardial
perfusion clinical trials for OPTISON indicate that it may be a useful contrast
agent for the evaluation of myocardial perfusion.  The Company believes that the
use of OPTISON in routine diagnostic as well as emergency room procedures may
significantly reduce the overall cost of patient care by substituting ultrasound
for more expensive diagnostic methods such as nuclear imaging and by enabling
more accurate screening of patients to determine whether follow-up diagnostic or
surgical procedures are required.  In March 1996, the Company announced that
preliminary analysis of Phase 2 myocardial perfusion results indicated a 92%
concordance between diagnoses of patients with known or suspected heart disease
made using dipyridamole-stress nuclear imaging, the current perfusion "gold
standard" and dipyridamole-stress harmonic ultrasound imaging using OPTISON.

  The Company has additionally completed Phase 2 clinical trials for an oral
ultrasound contrast agent, known as ORALEX, which may be used to enhance the
ultrasound image of the abdominal area and improve the ability to detect stomach
lesions and pancreatic tumors.  Preliminary evaluation of data from this study
suggests that ORALEX may provide significant diagnostic utility as compared both
with non-contrast images and with water, which is sometimes used as a contrast
agent but which has a short gastric emptying time and is of limited efficacy. 
MBI has entered into a strategic alliance with Chugai Pharmaceutical Co, Ltd.
("Chugai") to develop and commercialize ORALEX in Japan, Taiwan and South Korea.
In the United States, the Company is seeking a partner for continued development
of ORALEX.  Because of the Company's primary commitment to OPTISON and related
products, it has determined that it will begin Phase 3 clinical trials for
ORALEX only when it has found a collaborative partner to fund a significant
portion of the necessary clinical and regulatory activities in the United
States.
 
  In the area of computed tomography imaging ("CT"), MBI is developing a 
novel contrast agent, MB-840, which employs iodinated triglycerides ("ITG") 
to target hepatocytes (liver cells), thereby providing a site-specific 
contrast agent for CT.  Current CT imaging is not effective in identifying 
the very early stages of liver cancer even with the use of traditional 
iodinated x-ray contrast agents. The Company believes that MB-840 may make 
possible consistent early identification of liver cancer by CT.  At present, 
the Company is preparing to initiate pre-clinical trials for MB-840.

  MBI is collaborating with Mallinckrodt, Inc. ("Mallinckrodt") to develop and
commercialize OPTISON in all territories of the world with the exception of
Japan, Taiwan and South Korea.  Mallinckrodt is one of the world leaders in the
marketing of contrast imaging agents, with 1997 imaging agent sales of
approximately $801 million.


                                       3

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MBI's relationship with Mallinckrodt began in 1988 with the execution of a 
distribution agreement for North and South America and a related investment 
agreement pursuant to which Mallinckrodt paid the Company approximately $30 
million.
 
  The Company and Mallinckrodt expanded their original agreement in September 
1995 when the parties entered into an Amended and Restated Distribution 
Agreement ("ARDA").  ARDA expanded the geographic scope and extended the 
duration of Mallinckrodt's exclusive marketing rights. Mallinckrodt at that 
time also made a $13 million equity investment in MBI and committed $20 
million to the clinical development of OPTISON and related projects. MBI may 
receive up to an additional $9.5 million upon meeting certain territorial and 
product development milestones, of which $3 million has been received to 
date.  There can be no assurances, however, that future milestones will be 
met.
 
  In December 1996, the Company and Mallinckrodt amended ARDA to further expand
the geographical scope of Mallinckrodt's exclusive marketing and distribution
rights for OPTISON, ALBUNEX and related products.  The amendment extended
Mallinckrodt's exclusive territory to include the territory that the Company had
formerly licensed to Nycomed Imaging AS, consisting of Europe, Africa, India and
parts of Asia.
 
  Under ARDA, the Company is responsible for manufacturing all licensed 
products for sale to Mallinckrodt at a price generally equal to 40% of 
Mallinckrodt's quarterly average selling price to end users.  The Company is 
responsible for conducting clinical trials and securing regulatory approvals 
of the licensed products in the United States for cardiac indications. 
Mallinckrodt is responsible for conducting clinical trials and securing 
approvals of the licensed products in the United States for non-cardiac 
indications and is responsible for conducting all clinical trials and 
securing approvals in the other countries in Mallinckrodt's territory.
 
  In April 1998, the Company and Chugai entered into a strategic alliance to
develop and commercialize OPTISON and ORALEX in Japan, Taiwan and South Korea. 
(Chugai may market OPTISON under a name other than "OPTISON."  In the Chugai
agreement, OPTISON is referred to as "FS069," MBI's developmental name for
OPTISON.)  In exchange for granting to Chugai a royalty-based license to market
these products in the named countries, MBI received an upfront license fee from
Chugai of $14 million.  In addition, Chugai made an equity investment in MBI
common stock of $8.3 million at a premium of 40% over the then-prevailing market
price.  MBI is eligible to receive milestone payments of up to $20 million based
on the achievement of certain product development goals in the Japanese
territory and will receive royalties from Chugai from the sale of commercialized
products in the territory.
 
BUSINESS STRATEGY

  The Company's objective is to remain a leader in the development and
commercialization of innovative contrast imaging agents. MBI intends to achieve
this objective by implementing the following key strategies.

  DEVELOP OPTISON FOR MULTIPLE INDICATIONS. MBI's primary clinical developmental
objective is to gain additional regulatory approvals in the United States and
abroad for OPTISON for the diagnosis of multiple cardiac indications, such as
cardiac function and myocardial perfusion. Thereafter the Company intends to
expand the application of OPTISON by seeking approval for non-cardiac
(radiology) indications. The Company believes that the extensive knowledge that
it and Mallinckrodt have gained through the marketing of ALBUNEX regarding the
requirements of the medical and third-party payor communities will assist in the
commercialization of OPTISON.

  DEMONSTRATE COST-EFFECTIVENESS. The Company and Mallinckrodt will continue to
design studies to demonstrate the overall cost-effectiveness of using the
Company's ultrasound contrast agents. The Company believes that such studies may
establish that use of OPTISON can significantly reduce the overall cost of
patient care by substituting ultrasound for more expensive diagnostic
modalities, and by enabling more accurate screening of patients to determine
whether follow-up diagnostic or therapeutic procedures are required.


                                       4

<PAGE>

  NEW PRODUCT DEVELOPMENT. The Company has established significant clinical,
regulatory and manufacturing expertise in the development of OPTISON and
ALBUNEX. The Company intends to leverage this expertise for the development of
new, proprietary imaging products such as ORALEX, MB840, and other products.

INDUSTRY BACKGROUND

NON-ULTRASOUND IMAGING TECHNIQUES

  Since the discovery of x-rays, medical imaging has been used extensively to
diagnose and guide the treatment of diseases and injuries to internal organs.
Medical imaging can be used to identify high-risk patients, to make initial
diagnoses, to confirm diagnoses based on other information, to formulate
treatment plans, and to evaluate the effectiveness of treatment and detect the
recurrence of a medical problem. Generally, imaging improves patient care and
lowers health care costs by enabling the detection of disease or abnormal
structures not apparent by routine physical examination.

  There are a variety of medical imaging methods, or "modalities," available 
to the physician. The choice of modality by the physician depends on a number 
of factors, including the part of the body to be imaged, the suspected 
condition to be investigated, the cost of the procedure, the diagnostic 
usefulness of the image and the condition of the patient. Other important 
factors in determining the selection of a modality are the availability of 
equipment and trained operators and the ability to schedule time on the 
equipment. The major non-ultrasound modalities are:

  COMPUTED TOMOGRAPHY ("CT"). CT employs x-rays aimed into the body from several
different angles to create a computerized static "snapshot" image of soft tissue
and bones. CT is used extensively to image the head and neck for injury and
disease, and is also used to detect liver cancer and other hepatobiliary
diseases. CT may employ injectable contrast agents which absorb x-rays and
thereby enhance structural imaging. In 1996, approximately 23.5 million CT
examinations were performed in the United States, approximately 44% of which
employed a contrast agent. While CT is effective in revealing anatomic detail,
it is expensive, does not generally provide real-time images ("moving pictures")
or permit the assessment of blood flow, and exposes patients to radiation. CT is
rarely used to image the heart.

  CONVENTIONAL X-RAY. Familiar procedures such as chest x-rays and mammograms
use x-rays aimed from only a single angle and do not require computer
reconstruction to create an image. In 1994, approximately 5.2 million abdominal
x-rays performed in the United States employed barium as a contrast agent to
examine the gastrointestinal system. Conventional x-ray is not used to assess
heart function.

  MAGNETIC RESONANCE IMAGING ("MRI"). MRI creates an image by exposing the body
to a radio frequency pulse to which the body's hydrogen atoms respond in a way
detectable by the MRI equipment. This information is analyzed by computer and a
cross-sectional image is produced. MRI is used primarily to image soft tissues
in order to detect tumors, lesions, and injuries. An accurate image is produced,
but as with CT, the images are not real-time. In addition, MRI does not
generally provide information on blood flow or perfusion of blood into organs
and tissues, and has not yet been accepted as a primary diagnostic for imaging
of the heart.  In 1996, approximately 8.5 million MRI procedures were performed
in the United States, approximately 29% of which used a contrast imaging agent.
In 1994, MRI equipment cost up to $2 million.

  NUCLEAR IMAGING. Nuclear imaging requires the injection of radioactive
substances into the body. It is typically preceded by a stress echo exam. The
radiation is detected by a special camera and analyzed by computer, resulting in
a static image that does not depict blood flow in real time. Great care is
required in the handling and disposal of radioactive contrast agents. It is used
primarily to detect cardiovascular disease, malignancies and soft-tissue tumors.
It is also the current "gold standard" used to detect myocardial perfusion.
Approximately 10 million nuclear imaging procedures were performed in the United
States in 1994, approximately 3.0 million of which were cardiac perfusion
studies. In 1996, the median Health Care Finance Administration ("HCFA")
reimbursement rate for a nuclear cardiac exam was $850, excluding the cost of
any preceding echocardiogram.


                                      5

<PAGE>

  X-RAY ANGIOGRAPHY. Angiography is used to visualize real-time blood flow in 
the body's vasculature in order to determine the presence of blockages or 
occlusions in the vessels leading to the heart prior to performing bypass 
surgery or balloon angioplasty. A catheter is inserted into a vessel or 
directly into the heart chamber and a contrast agent that is visible using 
special x-ray detection equipment is injected. This procedure requires a 
specially-equipped laboratory. It is effective in locating blockages and 
occlusions, but it is expensive, invasive, and exposes the patient to x-ray 
radiation. In 1996, approximately 4.5 million angiographic examinations were 
performed in the United States, with a median HCFA reimbursement rate for a 
heart angiogram and catheterization procedure of approximately $2,000, 
excluding the cost of any preceding echocardiogram.

ULTRASOUND IMAGING

Ultrasound employs low-power, high-frequency sound waves which are directed at
the organ to be imaged by placing a generating instrument called a "transducer"
on the body near the organ. The sound waves are reflected off of the organ or
tissue back to the ultrasound machine. The ultrasound machine reads the
reflected sound waves and produces a cross-sectional real-time "moving picture"
image of the targeted organ or tissue. Ultrasound is used to image the heart,
liver, kidneys, gall bladder, pancreas, other abdominal structures, blood
vessels, and the reproductive system, and is also being investigated for use
with brain and breast examinations. Cardiac ultrasound examinations are called
"echocardiograms." Non-cardiac diagnostic ultrasound examinations are referred
to as "radiology" indications or applications. The advantages of ultrasound
include:

     SAFETY. The sound waves employed by ultrasound have no noticeable medical
     effect on the body. The same organs or sections of the body may be
     imaged repeatedly for long periods of time with no adverse effects.
     Ultrasound is routinely used in fetal examinations.

     EASE OF USE.  Ultrasound exams are relatively simple to perform and require
     little patient preparation. Unlike machines used for MRI, CT, nuclear
     imaging and x-ray angiography, ultrasound machines are compact and
     portable and do not require specially-equipped facilities or housing.

     REAL-TIME IMAGES. Unlike the other imaging modalities (with the exception
     of x-ray angiography), ultrasound creates a "moving picture" of the
     targeted organ. The organ under study may be safely examined over any
     period of time selected by the physician. This feature is especially
     important in heart examinations, where the dynamics of the beating
     heart are of diagnostic importance to the cardiologist.

     LARGE INSTALLED BASE. There is a large installed base of ultrasound
     machines throughout the world. In 1997, there were approximately
     72,000 machines installed in the United States. Several large
     manufacturers such as Hewlett-Packard, ATL, Acuson and Toshiba compete
     in the ultrasound hardware market.

     PRICE. Ultrasound is a relatively inexpensive procedure. In 1994, the HCFA
     reimbursement rate for a typical echocardiogram was approximately
     $570, while that for a cardiac exam using nuclear imaging was
     approximately $850. A heart angiogram and catheterization cost
     approximately $2,000. The average cost of an ultrasound machine was
     $120,000, while the average cost of nuclear imaging equipment was
     approximately $450,000.

  Although ultrasound is a widely-used imaging modality, the visual clarity of
non-contrast-enhanced ultrasound images is generally inferior to that obtainable
using certain of the other modalities. With each of the other modalities,
contrast agents are frequently used, and in nuclear imaging and x-ray
angiography, an imaging agent is required to create the images. Until the
introduction of ALBUNEX, no imaging agents were available in the United States
for use with ultrasound.


                                       6

<PAGE>

  "Conventional" ultrasound imaging sends and receives sound waves at a 
single frequency; this is called the "fundamental" frequency. The Company's 
products are being tested with new ultrasound techniques which, although 
currently not widely available, may find acceptance in diagnostic imaging 
over the next several years. The most significant of these new techniques is 
"harmonic imaging." Researchers have discovered that if the ultrasound 
machine's transducer is modified to read the sound waves returning from the 
imaged area at a multiple ("harmonic") of the outgoing fundamental frequency, 
and if a contrast agent is used, the resulting image can provide more 
complete information on blood flow and structures in the scanned area than is 
available with a conventional ultrasound exam. This is because the 
microspheres generate a harmonic signal significantly stronger than that 
generated by the tissue, resulting in a significantly enhanced 
signal-to-noise ratio.

PRODUCTS AND MARKETS

ALBUNEX AND OPTISON MICROSPHERE TECHNOLOGY

  Both OPTISON and ALBUNEX are ultrasound contrast imaging agents consisting of
gas-filled human albumin microspheres manufactured using MBI's proprietary
process and albumin microsphere technology. They are injected into an arm vein
and pass through the bloodstream to the right atrium and ventricle of the heart,
where they are pumped through the lungs and into the left atrium and ventricle
of the heart. The left ventricle is the chamber of the heart that pumps
oxygenated blood arriving from the lungs out to the rest of the body and is the
portion of the heart that is of the greatest clinical interest in the diagnosis
of heart disease.

  ALBUNEX microspheres are air-filled, while OPTISON microspheres are filled
with an insoluble gas, octafluoropropane. The use of OPTISON and ALBUNEX as
ultrasound imaging contrast agents relies on the greater acoustic reflectivity
of the microspheres relative to blood, which does not reflect sound waves well
and is effectively invisible to ultrasound imaging, and relative to the tissues
to which the blood carries the microspheres. Areas where OPTISON and ALBUNEX are
present will appear brighter and clearer than areas where no agent is present.
The contrast effect between the blood containing the microspheres and the
surrounding tissues enhances the ability to detect blood flow using ultrasound
imaging and permits the resolution of subtle differences in the density of the
target tissue structures.

  OPTISON, which uses a 1% albumin solution, has exhibited a safety profile in
clinical studies equivalent to that of ALBUNEX.  ALBUNEX consists of a 5%
albumin solution (in saline) in which the air-filled microspheres are suspended.
Human albumin is a protein extracted from human blood that has been used as a
blood expander for many years. Both ALBUNEX, which was first marketed in Japan
in October 1993, and OPTISON, marketed since January 1998, have been given to
over 30,000 patients with no clinically significant side effects.

ALBUNEX

  ALBUNEX is the first ultrasound contrast imaging agent to be approved by the
FDA.  It was approved for marketing in the United States in August 1994 to
assess cardiac function.  It has also been approved in Japan and Europe.  The
Company believes that, with the exception of certain niche applications, such as
the evaluation of fallopian tube patency (described in the "Fallopian Tube
Patency" section below), it is likely that ALBUNEX will be replaced in the
market by OPTISON because of the latter's superior performance characteristics. 

  FALLOPIAN TUBE PATENCY.  MBI and Mallinckrodt have identified fallopian tube
patency ("FTP") as a potentially promising radiology application for ALBUNEX.
Physicians attempting to diagnose female infertility must determine whether the
fallopian tubes are patent (open) or occluded (blocked). The two primary
procedures used to assess FTP are hysterosalpingography ("HSG") and
chromolaparoscopy. HSG involves the injection of an x-ray contrast agent or dye
into the uterus to allow observation and evaluation by x-ray of the flow through
the fallopian tubes. This procedure exposes the patient to radiation, which may


                                       7

<PAGE> 

cause an adverse reaction, and also frequently requires sedation or 
anesthesia. If HSG is inconclusive, a chromolaparoscopy may be ordered. This 
procedure exposes the patient to the risk of bleeding, infection, injury to 
internal structures, and reaction to the anesthetic.

  ALBUNEX may permit the use of ultrasound imaging to assess FTP, potentially
avoiding both surgery and the introduction of radiation into the patient's
reproductive system.  In February of 1997,  Mallinckrodt received unanimous
recommendation for approval from the Radiology Device Advisory Panel of the
United States Food and Drug Administration for ALBUNEX for assessment of FTP. 
Mallinckrodt received market clearance in June 1997 from the FDA for ALBUNEX for
the assessment of FTP and Mallinckrodt is currently selling ALBUNEX for that
purpose.

OPTISON

  OPTISON is the first perfluorocarbon based agent to have been approved for
sale in the United States by the U.S. Food and Drug Administration.  In May
1998, OPTISON became the first perfluorocarbon based agent to receive final
marketing authorization by the European Agency for the Evaluation of Medicinal
Products for use in patients with suspected or known cardiovascular disease. 
OPTISON consists of octafluoropropane-filled albumin microspheres of
approximately the same size and concentration as ALBUNEX. Because
octafluoropropane is insoluble in blood, the microspheres in OPTISON have
greater durability and remain intact in the bloodstream for over 5 minutes,
versus 35 to 40 seconds for ALBUNEX. This greater durability permits more of the
microspheres to pass from the right side of the heart, through the
microvasculature of the lungs, and into the left side of the heart. As a result,
OPTISON is superior to ALBUNEX in its ability to measure endocardial border
delineation and regional wall motion using ultrasound. More importantly, the
durability of the OPTISON microspheres enable them to circulate into the heart
muscle and may permit the assessment of myocardial perfusion using ultrasound.

  CARDIAC FUNCTION.  Clinical studies have demonstrated that OPTISON is
effective in visualizing blood flow in the chambers of the heart, including the
delineation of endocardial borders and the assessment of regional wall motion. 
In 15-20% of the echocardiograms performed annually in the United States, the
location of the wall of the left ventricle, or "endocardial border," cannot be
satisfactorily visualized or its location appears ambiguous.  Clinical studies
demonstrated a high success rate for this indication in cases of suboptimal
chamber wall imaging in both stressed and non-stressed patients. When sufficient
numbers of OPTISON microspheres reach the left ventricle, the acoustical
reflectivity of OPTISON in the chamber permits the endocardial border to be seen
by defining the walls of the chamber, or "endocardial border delineation." This
delineation in turn permits visualization of the movement of the walls of the
chamber as the heart beats, or "regional wall motion." Information regarding
endocardial border delineation and regional wall motion are important for
diagnostic purposes. If the chamber walls appear thicker than normal or are not
moving normally, it is a potential indicator that the surrounding heart muscle
is not receiving sufficient blood or is abnormal in some other way, which, in
turn, may indicate an infarction (heart attack), stenosis (partial blockage of
an artery) or other abnormal condition.  OPTISON has demonstrated efficacy at a
much lower dose than is required for ALBUNEX, with an equivalent safety profile.
The Company received FDA approval for OPTISON in December 1997.

  MYOCARDIAL PERFUSION.  Clinical studies indicate that the longer circulation
time of the octafluoropropane-filled microspheres in OPTISON may allow a
physician to assess myocardial perfusion using ultrasound. The Company conducted
a Phase 1 safety study which demonstrated a safe dosing range of many times the
expected efficacious dose and also showed myocardial perfusion in healthy
patients using a dose as low as 0.5 cc.  Analysis of Phase 2 results indicated a
92% concordance between diagnoses of patients with known or suspected heart
disease made using dipyridamole-stress nuclear imaging, the current perfusion
"gold standard," and dipyridamole-stress harmonic ultrasound imaging using
OPTISON.  In June 1998, the Company announced that results from Phase 2
myocardial perfusion clinical trials for OPTISON indicate that it may be a
useful contrast agent for the evaluation of myocardial perfusion.  The Company's
future Phase 3 studies will be designed to evaluate, among other things,
myocardial perfusion in cardiac patients using ultrasound at both fundamental
and harmonic frequencies.


                                    8

<PAGE>

  Myocardial perfusion is important because it provides oxygenated blood to the
heart muscle. If OPTISON is not detected in a portion of the heart muscle, or
not detected with the expected level of intensity, it means that a portion of
the muscle is not receiving enough blood ("ischemia"). This finding may be
diagnostic of several conditions, including coronary arterial stenosis and
myocardial infarction.

  The ability to rapidly assess the condition of the heart using OPTISON may
also prove efficacious and cost-effective in the emergency room and in the
subsequent treatment of heart attacks. For example, a patient arriving at the
emergency room complaining of chest pain may be quickly assessed using
ultrasound with OPTISON. If no perfusion defect is seen in the heart, a
myocardial infarction may be ruled out. Where a perfusion defect is detected
using OPTISON, the Company believes that information regarding its severity,
size and location may assist the physician in determining the patient's
condition. A patient with an extensive infarction may be sent immediately for an
angiogram and even emergency angioplasty. A patient with a less severe
infarction may be given a thrombolytic (clot-dissolving) agent. This patient may
then undergo an additional OPTISON echocardiogram to see whether the affected
area of the heart muscle has reperfused; that is, whether the thrombolytic agent
was successful in treating the condition. If the OPTISON echocardiogram shows
that the muscle has reperfused, the physician would not have to order any
additional emergency procedures and conventional treatment might begin.
Subsequent OPTISON echocardiograms may be used to assess the effectiveness of
the post-emergency-room treatment; for example, how the heart muscle has
responded to different medications, changes in diet, exercise program, weight
loss and other therapies.

  The Company believes that the assessment of myocardial perfusion may also be
important in screening high-risk patients prior to general surgery or other
potentially stressful treatment regimens. For example, a surgeon may wish to
assess whether an elderly or weakened patient is capable of undergoing a
particular surgery or treatment without a cardiac incident. An OPTISON
echocardiogram may be safely administered to assist the physician in making this
determination.
 
  Commercialization of OPTISON for myocardial perfusion may require the
conversion of present ultrasound equipment to harmonic imaging frequencies. 
Although the Company is aware of efforts to develop commercial harmonic modules
for attachment to existing ultrasound machines as well as efforts to develop new
harmonic imaging machinery by several hardware manufacturers, there can be no
assurance that any of these current efforts will be successfully commercialized.
See "Industry Background - Ultrasound Imaging."

  RADIOLOGY INDICATIONS.  The stability of the OPTISON microspheres renders the
product potentially suitable for a much greater range of indications than
ALBUNEX. In preclinical studies, OPTISON has been shown to perfuse the liver,
which may permit the detection of tumors and lesions using ultrasound.
Preliminary animal studies have shown OPTISON is able to perfuse the kidneys,
ovaries, prostate, testes and peripheral intracranial vessels. Clinical studies
are planned to evaluate the use of OPTISON in the detection of liver pathology
relative to the current imaging "gold standard" for analyzing liver pathology.

  OPTISON enjoys several other potential advantages. In clinical studies,
OPTISON has achieved greater efficacy at a fraction of the dose of ALBUNEX
required for the assessment of cardiac function. The Company expects that this
low dosage will make OPTISON attractive to the patient as well as the doctor. In
addition, OPTISON uses a 1% albumin solution, compared to a 5% albumin solution
required for ALBUNEX. The lower dose required and the lesser amount of albumin
used may lower MBI's per-unit manufacturing cost and may allow for the
production of more doses of OPTISON than ALBUNEX using equivalent manufacturing
capacity.

ORALEX
 
  The Company is developing ORALEX, an oral ultrasound contrast agent intended
to enhance images of the abdomen, including the small bowel, stomach lining and
structures adjoining the stomach, in particular the pancreas.

  Gas in the stomach interferes with ultrasound images of the abdominal area by
reflecting nearly all of the sound waves. If the ultrasound "noise" caused by
this gas can be removed, the stomach wall can be more effectively


                                       9

<PAGE>

visualized and the stomach itself can become an "acoustic window" to organs 
next to it which are difficult to visualize, such as the pancreas. ORALEX is 
a polydextrose solution which is administered orally and which may displace 
gas in the stomach for up to 30 minutes. This period of displacement could be 
sufficient to permit effective ultrasound imaging. The Company is evaluating 
the use of ORALEX to make ultrasound imaging as useful for diagnostic 
purposes as costlier and more complex procedures such as CT and more invasive 
procedures such as endoscopy.

  The ability to view the pancreas is of particular interest to physicians
because pancreatic cancer is very difficult to detect at an early stage, and
current imaging modalities are not effective for this purpose. By the time
pancreatic cancer tumors are sufficiently large to be detected using CT, for
example, the cancer has progressed to the point where the patient's condition is
terminal. In 1998, there will be approximately 28,900 deaths in the United
States from pancreatic cancer.
 
  In April 1998, MBI announced completion of its Phase 2 clinical trial of
ORALEX.  The preliminary evaluation of data from this study indicates that
ORALEX provides significant diagnostic utility as compared with non-contrast and
water-contrast imaging.
 
  MBI has entered into a strategic alliance with Chugai to develop and
commercialize ORALEX in Japan, Taiwan and South Korea.  See "General."  In the
United States, the Company is seeking a partner for continued development of
ORALEX. Because of the Company's primary commitment to OPTISON and related
products, it has determined that it will begin Phase 3 clinical trials for
ORALEX only when it has found a collaborative partner to fund a significant
portion of the necessary clinical and regulatory activities in the United
States.

OTHER RESEARCH AND DEVELOPMENT

  The Company's research and development activities seek improvements to
existing products and development of new contrast agents. The Company also
continues to develop process improvements to secure the efficient supply of its
products for developmental and commercial use.

  MBI is developing a novel contrast agent, MB-840, which employs iodinated
triglycerides ("ITG") to target hepatocytes (liver cells), thereby providing a
site-specific contrast agent for CT.  Current CT imaging is not effective in
identifying the very early stages of liver cancer even with the use of
traditional iodinated x-ray contrast agents. The Company believes that MB-840
may make possible consistent early identification of liver cancer by CT.  At
present, the Company is preparing to begin pre-clinical trials for MB-840.

  MBI holds an exclusive license from the University of Michigan for patents 
relating to the ITG technology which requires the Company to exercise 
diligence in the development and commercialization of ITG.  If the Company 
does not enter into a collaborative development relationship with a partner 
or determines that it will no longer invest its own resources in the 
development of ITG, the Company's license from the University of Michigan 
will terminate at the University's option.  At present, the Company continues 
to develop the product and will not actively pursue a marketing and 
development partner until a more optimal point in the development phase.

MARKETING AND LICENSE AGREEMENTS

  MALLINCKRODT, INC.  MBI's distribution agreement with Mallinckrodt forms the
basis of its product development and marketing program for products containing
albumin microspheres such as OPTISON and ALBUNEX.

  In December 1988, the Company entered into a distribution agreement with 
Mallinckrodt granting it the exclusive marketing and distribution rights for 
ALBUNEX as defined and gas-filled albumin microspheres in North and South 
America. Mallinckrodt paid the Company $6.0 million and agreed to pay the 
Company a further $21.0 million based on the successful completion of certain 
product development and regulatory milestones. Mallinckrodt also paid the 
Company $3.0 million for 181,818 unregistered shares of the Company's Common 
Stock. Under the distribution agreement, the Company is responsible for 
conducting clinical trials and securing regulatory approvals of the licensed 
products in the United States for cardiac indications, and Mallinckrodt is 
responsible for conducting 

                                      10
<PAGE>

clinical trials and securing regulatory approvals in the United States for 
non-cardiac indications and is responsible for conducting all clinical trials 
and securing approvals in the other countries in Mallinckrodt's territory.
 
  The Company manufactures all licensed products for sale to Mallinckrodt at a
price generally equal to 40% of Mallinckrodt's quarterly average selling price
to end users. If the Company declines to manufacture OPTISON or ALBUNEX for
Mallinckrodt because the quarterly average selling price falls below a level
specified in the Company's distribution agreement with Mallinckrodt or the
proposed initial price in a new market or for a new indication is below the
specified level, or if the Company is unable to manufacture OPTISON or ALBUNEX
in sufficient quantities to satisfy Mallinckrodt's orders on a timely basis,
Mallinckrodt may exercise certain contingent manufacturing rights. MBI will
receive a royalty of 5-10% on Mallinckrodt's sales of OPTISON or ALBUNEX which
Mallinckrodt has manufactured.
 
  The distribution agreement lasts for the life of the licensed patents and,
prior to amendment in September 1995, granted Mallinckrodt exclusive rights for
five years following the first commercial sale of ALBUNEX in the United States,
after which MBI was granted the assignable right to co-market the licensed
products. In accordance with the distribution agreement, the Company undertook
to acquire license rights from a third party to a United States patent for
certain related technology. The Company acquired these rights in February 1991,
and in connection with this acquisition the Company and Mallinckrodt agreed to
pay royalties to the licensor of 0.8% and 1.2%, respectively, on the net sales
of ALBUNEX in the United States.
 
  The Company's relationship with Mallinckrodt was strengthened and expanded in
September 1995 when the parties entered into an Amended and Restated
Distribution Agreement ("ARDA"). ARDA expands the geographic scope of
Mallinckrodt's exclusive right to market the licensed products to include all of
the countries of the world other than those covered by the Company's then
existing license agreements with Shionogi and Nycomed and extends the duration
of Mallinckrodt's exclusive rights to the later of July 1, 2003 or three years
after the date that the Company obtains approval from the FDA to market OPTISON
for an intravenous myocardial perfusion indication. Mallinckrodt agreed to pay
the Company $20.0 million over four years beginning in October 1995 to support
clinical trials of OPTISON, related regulatory submissions and associated
product development and to pay up to an additional $9.5 million upon the
satisfaction of certain territorial and product development milestones.
 
  ARDA requires the Company to spend at least $10.0 million for clinical trials
to support regulatory filings with the FDA for cardiac indications of OPTISON.
The Company's expenditures will be made in accordance with the directions of a
joint steering committee which the Company and Mallinckrodt have established in
order to coordinate the development and regulatory approval of OPTISON.

  Under a related investment agreement, Mallinckrodt purchased 1,118,761 shares
of the Company's Common Stock for $13.0 million at a premium of 40% above the
then-prevailing market price. In addition, ARDA grants the Company the option to
repurchase all of the shares of the Company's Common Stock that Mallinckrodt
purchased under the related investment agreement for $45.0 million, subject to
various price adjustments. This option is exercisable from the later of July 1,
2000, or the date that the FDA approves OPTISON for a myocardial perfusion
indication, through the later of the third anniversary of such approval or June
30, 2003. If the Company exercises this option, the Company or its assignee may
co-market licensed products in all of the countries covered by ARDA.
 
  In December 1996, the Company and Mallinckrodt amended ARDA to expand the
geographical scope of Mallinckrodt's exclusive marketing and distribution rights
for OPTISON, ALBUNEX and related products.  The amendment extended
Mallinckrodt's exclusive territory to include the territory that the Company had
formerly licensed to Nycomed consisting of Europe, Africa, India and parts of
Asia.  Under the amendment to ARDA, Mallinckrodt agreed to pay fees of up to
$12.9 million plus 40 percent of product sales to cover royalties and
manufacturing.  Mallinckrodt made an initial payment of $7.1 million, consisting
of reimbursement to the Company of $2.7 million that the Company paid to Nycomed
to reacquire the exclusive product rights in Nycomed's territory, payment of $3
million to the Company under the terms of ARDA upon the extension of
Mallinckrodt's exclusive rights to Nycomed's former territory, and payment of
$1.4 million to Nycomed in satisfaction of the Company's obligation to pay 45%
of any amounts that the Company receives in excess of $2.7 million upon the
licensing of the former Nycomed territory to a third party.  Of the remaining
$5.8 million that may be paid, Mallinckrodt will pay $4 


                                      11

<PAGE>

million to the Company (upon the achievement of the specified product 
development milestone) and $1.8 million to Nycomed (representing 45% of the 
$4 million payment to the Company). There can be no assurance, however, that 
this milestone will be satisfied.

  SHIONOGI & CO., LTD.  In March 1989, the Company entered into a license and
cooperative development agreement with Shionogi, of Osaka, Japan. Under this
agreement, the Company granted Shionogi exclusive marketing and distribution
rights for ALBUNEX and other gas-filled albumin microsphere products in Japan,
Taiwan and South Korea.  In September 1996, the Company and Shionogi entered
into an agreement pursuant to which the Company reacquired all product rights
from Shionogi.  See "Item 3 -- Legal Proceedings."
 
  CHUGAI PHARMACEUTICAL CO., LTD.  In an agreement dated March 31, 1998, the
Company entered into a cooperative development and marketing agreement with
Chugai Pharmaceutical Co., Ltd. ("Chugai") of Japan.  The parties entered into
this strategic alliance which covers Japan, Taiwan and South Korea, to develop
OPTISON (which may be marketed under a different name) and ORALEX, as well as
related products.  The Company granted Chugai an exclusive license to develop,
manufacture, and market these products in the subject territory, for which the
Company received an upfront license fee of $14 million.  With respect to
licensed products manufactured by Chugai, Chugai will pay the Company a royalty
on net sales.  For licensed products manufactured by the Company, the Company
will receive royalties on net sales, depending upon the sales volume, in
addition to a transfer price based on average net sales per unit from the
previous quarter. Additionally, Chugai purchased 691,883 shares of the Company's
common stock at a premium of 40% over the then-prevailing market price.  The
equity investment was valued at $8.3 million.  The Company is also eligible to
receive milestone payments of up to $20 million based on Chugai's achievement of
certain Japanese product development and regulatory goals. 
 
  NYCOMED IMAGING AS.  In December 1987, the Company entered into a license 
agreement with Nycomed's predecessor, Nycomed AS, of Oslo, Norway. Under this 
agreement, the Company granted Nycomed exclusive developmental, 
manufacturing, and marketing rights for ALBUNEX and other gas-filled albumin 
microsphere ultrasound imaging agents in the territory comprising Europe, the 
former Soviet Union, Africa and the Middle East. India was later added to 
this territory. While Nycomed performed manufacturing and clinical 
development work on ALBUNEX (called "Infoson" by Nycomed), the Company and 
Nycomed concluded that their respective strategic interests were best served 
by the Company's reacquisition of Nycomed's product rights, and in October 
1995 the parties entered into an amendment of their agreement that 
effectively returned these rights to the Company. The Company agreed to pay 
Nycomed $2.7 million plus 45% of any amounts in excess of $2.7 million that 
the Company receives in payment for the transfer of marketing rights in the 
former Nycomed territory to a third party. The Company also agreed to pay 
Nycomed a royalty of 2-1/2% on the first $30.0 million of annual sales of 
licensed products and 3-1/2% on any annual sales in excess of $30.0 million.

  FEINSTEIN LICENSE. In November 1986, the Company entered into a license 
agreement under which it acquired the exclusive right to develop, use and 
sell any products derived from patents and applications owned by Stephen B. 
Feinstein, M.D. covering sonicated gas-filled albumin microspheres used for 
imaging and any future related patents and applications. In June 1989, this 
agreement was restructured. The Company paid the licensor $4.5 million as an 
additional license fee and $2.0 million as a prepayment of royalties to be 
earned on the first $66.7 million of sales of the licensed products in the 
United States, and the royalty rate on sales of licensed products was reduced 
from 6% to 3% on worldwide net sales by the Company (and United States sales 
by a sublicensee) and from 2-1/2% to 1-1/4% on net sales by sublicensees 
outside of the United States. Under the restructured agreement, the Company 
is required to pay minimum royalties each year, increasing from $100,000 in 
1994 to $600,000 in 1999 and subsequent years.

  ITG AGENT. In November 1991, the Company entered into an exclusive license 
agreement with the University of Michigan for certain patents relating to the 
Company's ITG CT agent, MB-840, under development. The Company paid a license 
fee of $20,000 and pays an annual license maintenance fee of $15,000. The 
Company agreed to pay a royalty of from 2-1/2% to 6% on net sales of licensed 
products, depending upon the jurisdiction and status of the particular 
product, and also agreed to make annual minimum royalty payments increasing 
from $25,000 to $150,000.

PATENTS AND TRADEMARKS


                                      12

<PAGE>

  The Company considers the protection of its proprietary technologies to be 
material to its business prospects. The Company pursues a comprehensive 
program of patent and trademark prosecution for its products both in the 
United States and in other countries where the Company believes that 
significant market opportunities exist.

  The Company has an exclusive license to certain United States and foreign 
patents relating to gas-filled sonicated albumin microspheres from Steven B. 
Feinstein, M.D.  See "Marketing and Licensing Agreements - Feinstein 
License." The Company itself owns additional United States and foreign 
patents covering ALBUNEX that broaden the product coverage of its license. 
Certain of these additional patents cover the Company's continuous flow 
sonication manufacturing process. The European equivalents of these 
manufacturing patents were challenged in an opposition proceeding brought by 
Andaris Ltd. which was decided in the Company's favor in January 1996. 
Andaris has appealed the decision.  Andaris has also filed an opposition 
against the Company's ALBUNEX composition patent in Europe, and Andaris and 
two other parties have filed a similar opposition in Japan.  No hearing date 
has been set in these latter two oppositions.

  The Company has received a patent covering its method of manufacturing 
gas-filled albumin microspheres using a milling process under development. 
The Company believes that this process may be more efficient than the 
sonication process that the Company currently uses. The Company has also 
received patents on other perfluorocarbon-based technology relating to 
ultrasound contrast agents.
 
  The Company owns a United States patent covering ORALEX and has several 
foreign applications pending. The Company has also filed patent applications 
relating to several early-stage development products. The Company is 
uncertain whether these applications will result in issued patents or whether 
the covered products can or will be commercialized.

  The last-to-expire of the Company's key United States patents covering 
OPTISON and ALBUNEX expires in 2008, and subject to the outcome of the 
oppositions previously described, the last-to-expire of the Company's key 
European patents covering OPTISON and ALBUNEX expires in 2009.
 
  The patent position of medical and pharmaceutical companies is highly 
uncertain and involves complex legal and factual questions.  There can be no 
assurance that the Company will receive patents for all or any of the claims 
included in its pending or future patent applications, that any issued 
patents will provide the Company with competitive advantages or will not be 
challenged by third parties, or that existing or future patents of third 
parties will not have an adverse effect on the Company's ability to 
commercialize its products. Moreover, there can be no assurance that third 
parties will not independently develop similar products, duplicate one or 
more of the Company's products or design around the Company's patents.

  The Company's commercial success also will depend in part upon the Company 
not infringing patents issued to third parties.  There can be no assurance 
that patents issued to third parties will not require the Company to alter 
its products or manufacturing processes, pay licensing fees, or cease 
development of its current or future products. 

     Litigation or administrative proceedings may be necessary to enforce the 
Company's patents, to defend the Company against infringement claims or to 
determine the priority, scope and validity of the proprietary rights of third 
parties.  See "Legal Proceedings."  Any such litigation or administrative 
proceedings could result in substantial costs to the Company, and an 
unfavorable outcome could have a material adverse effect on the Company's 
business, financial condition and results of operation. Moreover, there can 
be no assurance that, in the event of an unfavorable outcome in any 
litigation or administrative proceedings involving infringement claims 
against the Company, the Company would be able to license any proprietary 
rights that it requires on acceptable terms or at all.  The Company's failure 
to obtain a license that it requires to commercialize one of its products 
could have a material adverse effect on the Company's business, financial 
condition and results of operations.

     The Company has become aware of several United States patents issued to 
other companies purportedly covering various attributes of 
perfluorocarbon-containing imaging agents such as OPTISON.  Certain of these 
companies also are pursuing foreign patent protection.  Some of these 
companies are developing or may be

                                       13

<PAGE>

developing ultrasound contrast imaging agents that would compete with 
OPTISON.  The patents and patent applications of these other companies 
involve a number of complex legal and factual issues that are currently 
unresolved.  The Company believes that there may be a substantial overlap 
among many of the claims in their patents and is currently involved in 
various administrative proceedings and litigation in the United States and 
Europe to adjudicate their conflicting rights.

  The Company believes that, for a variety of reasons, its commercialization 
of OPTISON will not infringe any valid patent held by any of these other 
companies.  Depending upon the particular patent claim, these reasons 
include, but are not limited to (i) differences between OPTISON and the 
subject of the claim, (ii) the invalidity of the claim due to the existence 
of prior art, (iii) the inadequacy of the claim's specifications, (iv) lack 
of enablement, (v) inequitable conduct by patentee, and (vi) various other 
defenses as allowed by law.  The Company intends to challenge the validity of 
any such patent granted to one of the other companies if the patent is 
asserted against the Company, and the Company will enforce its own patents if 
any product of one of the other companies infringes the Company's patent 
claims.  See "Legal Proceedings."

  The Company has obtained registered trademarks for "ORALEX" and "ALBUNEX" 
in the United States and in selected foreign countries.  Additionally 
Mallinckrodt has filed for the trademark for "OPTISON" in various countries 
throughout the world.  There can be no assurance that the Company's 
registered or unregistered trademarks and trade names will not infringe on 
the proprietary rights of third parties.
 
  The Company also relies on unpatented trade secrets, proprietary know-how 
and continuing technological innovation which it seeks to protect by, in 
part, confidentiality agreements with its employees, consultants, 
investigators and others. There can be no assurance that these agreements 
will not be breached, that the Company would have an adequate remedy for any 
breach or that the Company's trade secrets or know-how will not otherwise 
become known or independently discovered by third parties.

MANUFACTURING

  The Company manufactures OPTISON and ALBUNEX for commercial sale in the 
United States in its aseptic plant at its principal San Diego facility. The 
plant employs the Company's patented continuous-flow sonication process in 
which a mixture of sterile albumin solution and gas is subjected to 
ultrasonic energy. This treatment denatures the albumin protein and 
facilitates a process known as "cavitation" in which the stable gas-filled 
microspheres are created. The Company believes that its current facilities 
will provide sufficient production capacity for the foreseeable future.
 
  The Company has been able to meet all orders for OPTISON and ALBUNEX 
received to date from Mallinckrodt. The Company believes that its 
manufacturing reliability will continue to improve and that it will not 
experience any significant difficulty in manufacturing products in compliance 
with the FDA's Good Manufacturing Practices.

  The Company is also developing a method of manufacturing gas-filled albumin 
microspheres using a milling process. The Company believes that this patented 
process may be more efficient than the sonication process that it presently 
uses. The milling process is in the last stages of development.  There can be 
no assurance that the process will be successfully developed, that it can be 
successfully integrated with the Company's operations, or that the FDA will 
approve the process.

COMPETITION

  In general, competition in the field of contrast agents is based on such 
factors as product performance and safety, product acceptance by physicians, 
patent protection, manner of delivery, ease of use, price, distribution and 
marketing. The Company's products compete or may compete with new or improved 
contrast agents.

  The Company anticipates that it will face increased competition in the 
future as new products enter the market and advanced technologies become 
available. The Company expects to compete against a number of companies,

                                       14

<PAGE>

many of which have substantially greater financial, technical and human 
resources than the Company and may be better able to develop, manufacture and 
market products. In addition, many of the Company's existing or potential 
competitors have extensive experience in research, preclinical testing and 
human clinical trials, obtaining FDA and other regulatory approvals, and 
manufacturing and marketing their products, or are allied with major 
pharmaceutical companies that can afford them these advantages. As a result, 
competitors may develop and introduce competitive or superior products more 
rapidly than the Company. While the Company was the first to obtain FDA 
approval of ultrasound contrast agents, OPTISON and ALBUNEX, the Company 
expects that one or more of these competitors will develop products that will 
be approved for an indication or indications covered by OPTISON or ALBUNEX, 
including the assessment of cardiac function and myocardial perfusion. There 
can be no assurance that existing products or new products developed by the 
Company's competitors will not be more effective than any products that may 
be developed by the Company. Competitive products may render the Company's 
technology and products obsolete or noncompetitive.

  Any product developed by the Company that gains regulatory approval will 
have to compete for market acceptance and market share. An important factor 
in such competition may be the timing of market introduction of competitive 
products. Accordingly, the relative speed with which the Company can develop 
products, complete clinical testing and the regulatory approval process, gain 
reimbursement acceptance and supply commercial quantities of the product for 
distribution to the market are expected to be important competitive factors. 
In addition, the Company believes that the primary competitive factors in the 
market for ultrasound imaging agents are safety, efficacy, ease of delivery, 
reliability, innovation and price. The Company also believes that physician 
relationships and customer support are important competitive factors.

GOVERNMENT REGULATION

  The Company's diagnostic products are subject to substantial regulation by 
the FDA and comparable agencies in foreign countries. Pursuant to the federal 
Food, Drug and Cosmetic Act, as amended, and the regulations promulgated 
thereunder, the FDA regulates the research, development, clinical testing, 
manufacture, labeling, distribution and promotion of medical products. 
Noncompliance with applicable requirements can result in, among other things, 
fines, injunctions, civil penalties, recall or seizure of products, total or 
partial suspension of production, refusal by the FDA to review New Drug 
Applications ("NDA"), withdrawal of marketing approvals, a recommendation by 
the FDA that the Company not be permitted to enter into government contracts, 
and criminal prosecution.

  The process of obtaining FDA approval of new products like OPTISON, ORALEX 
and MB840 involves many steps.  Results of laboratory and animal tests to 
determine efficacy and safety, including potential toxicity, are submitted to 
the FDA as part of an application for an Investigational New Drug ("IND") 
before clinical trials on humans can begin. After completion of clinical 
trials, an NDA, in the case of drugs, must be submitted to the FDA for review 
and approval before commercial marketing and sale may begin for a new 
indication.

  Classified as drugs by the FDA, OPTISON and ALBUNEX are required to undergo 
the NDA process. An NDA must be supported by valid scientific evidence that 
typically includes extensive data, including preclinical and human clinical 
trial data to demonstrate the safety and efficacy of the drug. If human 
clinical trials of a drug are required, the sponsor of the trial is required 
to file an Investigational New Drug ("IND") Application with the FDA prior to 
beginning human clinical trials. The IND application must be supported by 
data, typically including the results of animal and laboratory testing. If 
the IND application is approved by the FDA and the appropriate institutional 
review boards, human clinical trials may begin at a specific site with a 
specific number of patients, as specified in the approved protocol.  An IND 
supplement must be submitted to and approved by the FDA before a sponsor or 
an investigator may make any change to the investigational plan that may 
affect its scientific soundness or the rights, safety or welfare of human 
subjects.

  In addition to the results of clinical trials, the NDA must also contain 
the results of all relevant bench tests, laboratory and animal studies, a 
complete description of the drug and its components, and a detailed 
description of the methods, facilities and controls used to manufacture the 
drug. In addition, the submission must include the proposed labeling, 
advertising literature and any relevant training methods. Upon receipt of an 
NDA application, the

                                       15

<PAGE>

FDA makes a threshold determination whether the application is sufficiently 
complete to permit a substantive review. If the FDA determines that the NDA 
is sufficiently complete to permit a substantive review, the FDA will accept 
the application for filing. Once the submission is accepted for filing, the 
FDA begins an in-depth review of the NDA. An FDA review of an NDA application 
generally takes one to two years from the date that the NDA application is 
accepted for filing, but may take significantly longer. The review time is 
often significantly extended as a result of the FDA asking for more 
information or for clarification of information already provided in the 
submission. During the review period, an advisory committee, typically a 
panel of clinicians, will likely be convened to review and evaluate the 
application and provide recommendations to the FDA as to whether the drug 
should be approved. The FDA is not bound by the recommendations of the 
advisory panel. Toward the end of the review process, the FDA generally will 
conduct an inspection of the manufacturer's facilities to ensure that the 
facilities are in compliance with the applicable Good Manufacturing Practices 
("GMP") requirements.

  If the FDA's evaluations of both the NDA application and the manufacturing 
facilities are favorable, the FDA will either issue an approval letter or, in 
some cases, an "approvable letter" containing a number of conditions which 
must be met in order to obtain final approval of the NDA. When and if those 
conditions have been fulfilled to the satisfaction of the FDA, the agency 
will issue an NDA approval letter authorizing commercial marketing of the 
drug for the specified indications. If the FDA's evaluation of the NDA 
applications or manufacturing facilities is not favorable, the FDA will deny 
approval of the NDA application or issue a "not approvable" letter. The FDA 
may also determine that additional clinical trials are necessary, in which 
case NDA approval could be delayed for several years while additional 
clinical trials are conducted and submitted in an amendment to the NDA. The 
NDA process can be expensive, uncertain and lengthy, and a number of drugs 
for which approval has been sought by other companies have never been 
approved for marketing.

  Any drugs manufactured or distributed by the Company pursuant to FDA 
approvals are subject to pervasive and continuing regulations by the FDA and 
certain state agencies. The FDA often requires drug manufacturers to conduct 
post marketing surveillance studies following approval to further evaluate 
the safety and effectiveness of the drug. Foreign and domestic regulatory 
approvals, if granted, may include significant limitations on the indicated 
use for which the product may be marketed. In addition, the FDA and certain 
foreign regulatory authorities impose numerous other requirements with which 
medical drug manufacturers must comply. Product approvals could be withdrawn 
for failure to comply with regulatory standards or as a result of the 
occurrence of unforeseen safety or effectiveness problems following initial 
marketing. The Company will also be required to adhere to applicable FDA 
regulations setting forth current GMP requirements, which include testing, 
control and documentation requirements. The Company is also required to 
register with the FDA and with state agencies such as the California 
Department of Health Services as a drug manufacturer and to list its products 
with the FDA. Ongoing compliance with GMP and other applicable regulatory 
requirements is monitored through periodic inspections by state and federal 
agencies, including the FDA, and by comparable agencies in other countries. 
Changes in existing regulations or adoption of new regulations could prevent 
the Company from obtaining, or affect the timing of, future approvals or 
clearances.

  The FDA and equivalent foreign agencies have significant discretion in 
their conduct of each stage of the regulatory process. Adverse decisions are 
effectively unappealable, and agency delays are an unfortunate fact of life 
for the companies they regulate.

  The Company also intends to sell OPTISON and ALBUNEX in foreign countries. 
The time required to obtain approval for sale in foreign countries may be 
longer or shorter than that required for FDA approval, and the requirements 
may differ.

  Labeling, advertising and other promotional activities are subject to 
scrutiny by the FDA and in certain instances by the Federal Trade Commission. 
The FDA actively enforces regulations prohibiting marketing of products for 
unapproved uses, sometimes called "off-label" uses. The Company and its 
products are also subject to a variety of state laws and regulations in those 
states or localities where its products are or will be marketed. Any 
applicable state or local regulations may hinder the Company's ability to 
market its products in those states or localities.

  The Company is also subject to numerous federal, state and local laws 
relating to such matters as safe working conditions, manufacturing practices, 
environmental protection, fire hazard control and disposal of hazardous or 

                                       16

<PAGE>

potentially hazardous substances. There can be no assurance that the Company 
will not be required to incur significant costs to comply with such laws and 
regulations now or in the future or that such laws or regulations will not 
have a material adverse effect upon the Company's ability to do business.

  Changes in existing requirements or the adoption of new requirements or 
policies could adversely affect the ability of the Company to comply with 
regulatory requirements. Failure to comply with regulatory requirements could 
have a material adverse effect on the Company's business, financial condition 
and results of operations. There can be no assurance that the Company will 
not be required to incur significant costs to comply with laws and 
regulations in the future or that laws or regulations will not have a 
material adverse effect on the Company's business, financial condition, or 
results of operations.

THIRD PARTY REIMBURSEMENT
 
  In the United States, the Company's products will be purchased primarily by 
medical institutions that will then bill various third-party payors such as 
Medicare, Medicaid and other government programs and private insurance plans. 
In considering reimbursement for a new medical product, these payors must 
decide both whether to cover the product and how much to pay for it.

  In general, to be covered by Medicare, a health care product or service 
must be "reasonable and necessary" for the diagnosis or treatment of an 
illness or injury. This requirement has been interpreted to mean that the 
product or service must be safe and effective, not experimental or 
investigational (except under certain limited circumstances involving drugs 
furnished pursuant to a FDA-approved clinical trial), and appropriate. 
Medicaid, Blue Cross and Blue Shield plans, commercial insurers and other 
third-party payors generally have limitations on coverage which are similar 
to those of Medicare.

  Even if a drug has received approval or clearance for marketing by the FDA, 
there is no assurance that Medicare or other third-party payors will cover 
the drug or related services. The Company is aware that certain third party 
payors are providing reimbursement for OPTISON contrast echocardiography 
procedures. Plans and programs are in place to develop expanded coverage 
among third party payors.  However, the Company also acknowledges that these 
payors may place certain restrictions on the circumstances in which coverage 
will be available. In making such coverage determinations, the Health Care 
Financing Administration ("HCFA"), which administers the Medicare program, 
and HCFA's contractors consider, among other things, peer-reviewed articles 
concerning the safety and effectiveness of the drug, the opinions of medical 
specialty societies, and input from the FDA, the National Institutes of 
Health, and other government agencies. There is no assurance that the 
Company's products will be covered by Medicare and other third-party payors.

  Failure by hospitals and physicians to receive what they consider to be 
adequate reimbursement for procedures in which the Company's products are 
used would have a material adverse effect on the Company's business, 
financial condition and results of operations.

EMPLOYEES

  As of March 31, 1998, the Company had 148 full-time employees, including 6 
officers.  Approximately 29 of the Company's employees were involved directly 
in scientific research and development activities.  Of these employees, 13 
held Ph.D. or M.D. degrees. The Company considers its relations with its 
employees to be good, and none of its employees is a party to a collective 
bargaining agreement.

ITEM 2.        PROPERTIES

                                       17

<PAGE>

  The Company's corporate offices and laboratory, manufacturing and warehouse 
facilities occupy a total of 74,097 square feet in San Diego, California. The 
Company owns a 44,000 square-foot building purchased in 1989 and leases an 
additional 30,097 square-foot facility under an agreement expiring in 
February 2000.  In addition, during fiscal 1998, the Company leased a 50,000 
square-foot facility under an agreement which was effectively terminated May 
31, 1998.  The Company anticipates that its current facilities will be 
sufficient to meet its needs into the foreseeable future. 

ITEM 3.        LEGAL PROCEEDINGS

  In April 1997, separate lawsuits were filed by Bracco Diagnostics, Inc. 
("Bracco"), DuPont Merck Pharmaceutical Co. ("DuPont Merck"), ImaRx 
Pharmaceutical Corp. ("ImaRx"), and Sonus Pharmaceuticals, Inc. ("Sonus") 
against the United States Food and Drug Administration (the "FDA") seeking a 
preliminary and permanent injunction to keep the FDA from approving the 
Company's pre-market approval application ("PMA") for the Company's 
second-generation ultrasound imaging agent, OPTISON, until the FDA resolved 
the merits of citizen petitions that the plaintiffs previously filed with the 
FDA.   These petitions requested the FDA to regulate all ultrasound imaging 
contrast agents either as drugs (as the plaintiffs' contrast agents under 
development are currently classified) or as medical devices (as both the 
Company's OPTISON and ALBUNEX were then classified).  The lawsuits (the "FDA 
Cases") alleged that the FDA acted in an arbitrary and capricious manner in 
its review of the parties' ultrasound contrast agents and requested the FDA 
to review all ultrasound contrast agents in a consistent manner.
 
  In response, the United States District Court entered an order enjoining 
the FDA from continuing any approval or review procedures relating the 
Company's PMA for OPTISON until ten days after the FDA ruled on the 
plaintiffs' citizen petitions.  In February 1997, the FDA's advisory 
Radiological Devices Panel had recommended approval of the Company's PMA for 
OPTISON as a device.
 
  On July 29, 1997, the FDA ruled that OPTISON could be properly classified 
as a drug under the applicable sections of the Food and Drug Act and FDA 
regulations and for administrative reasons transferred review of the 
Company's PMA for OPTISON from the Center for Devices and Radiological Health 
("CDRH") to the Center for Drug Evaluation and Research ("CDER").
 
  On December 31, 1997, the Company's new drug application for OPTISON, the 
Company's second generation contrast agent for cardiac ultrasound imaging, 
was approved by the FDA. This approval permits the marketing of OPTISON in 
the United States for use in patients with suboptimal echocardiograms to 
opacify the left ventricle and to improve the delineation of the left 
ventricular endocardial borders.
 
  On July 31, 1997 the Company and its marketing partner, Mallinckrodt, Inc. 
("Mallinckrodt") filed suit (the "MBI Case") in United States District Court 
for the District of Columbia against four potential competitors - Sonus, 
Nycomed Imaging AS ("Nycomed"), ImaRx and its marketing partner DuPont Merck 
and Bracco - seeking declarations that certain of their ultrasound contrast 
agent patents are invalid.  On the same day, the Company and Mallinckrodt 
filed counterclaims in cases filed against the FDA by Bracco, Sonus, ImaRx 
and DuPont Merck in which the Company had intervened as a defendant seeking 
the same relief as in the MBI Case.  The court subsequently dismissed these 
counterclaims following the FDA's reclassification ruling (as reported 
above), and resulting mootness of the proceedings against the FDA.
 
  The complaint filed by the Company and Mallinckrodt in the MBI Case alleges 
that each of the defendants' patents is invalid on a variety of independent 
grounds under U.S. patent law.  In addition to requesting that all of the 
patents in question be declared invalid, the complaint requests a declaration 
that, contrary to defendants' contentions, the Company and Mallinckrodt do 
not infringe the defendants' patents, and asks that defendants be enjoined 
from proceeding against the Company and Mallinckrodt for infringement until 
the status of defendants' patents has been determined by the court or the 
U.S. Patent and Trademark Office ("PTO").  The complaint alleges

                                       18

<PAGE>

that each defendant has claimed or is likely to claim that its patent or 
patents cover OPTISON, the Company's second generation ultrasound contrast 
agent, and will attempt to prevent its commercialization.
 
  All of the defendants except Nycomed filed motions to dismiss the complaint 
on juridictional grounds.  In January 1998, the court hearing the MBI Case 
dismissed each of the defendants except Nycomed, ruling that the court lacked 
jurisdiction over those defendants with respect to the Company's claims of 
patent invalidity and non infringement.  The court's ruling does not purport 
to rule on the merits of the Company's claims; the dismissal was based solely 
on jurisdictional grounds.
 
  Following Sonus's dismissal as a defendant in the MBI Case, Sonus activated 
the patent infringement lawsuit (the "Sonus Case") which it had filed in 
August 1997 against the Company and Mallinckrodt in the United States 
District Court for the Western District of Washington.  Sonus's complaint 
alleges that the manufacture and sale of OPTISON by the Company and 
Mallinckrodt infringe two patents owned by Sonus.  As in the original MBI 
case, MBI counterclaimed for a declaration of invalidity and non-infringement 
with respect to the Sonus patents.  These two patents are the same patents 
for which the Company was seeking a declaration of invalidity in the MBI 
Case.  As discussed below, in conjunction with the reexamination proceedings, 
the PTO has issued a final rejection of all claims of the patents involved in 
the Sonus case.  Although the complaint was filed in August 1997, Sonus had 
agreed not to proceed with the Sonus Case until the jurisdictional motions 
were decided in the MBI Case.

  Beginning in July 1997, the Company received the first of five notices from 
the PTO granting the Company's petitions for reexamination which it had filed 
with respect to five patents held by three potential competitors, Sonus, 
Nycomed and ImaRx.  Each of the five notices stated there was a substantial 
new question of patentability raised by the Company's petitions with respect 
to all claims of the patents.  Each of the patents in the reexamination 
process is related to the use of perfluorocarbon gases in ultrasound contrast 
agents and is included among the patents for which the Company was seeking a 
declaration of invalidity in the MBI Case (and for which the Company is 
continuing to seek a declaration of invalidity in the case of Nycomed's 
patents). 

  In late 1997 and early 1998, the PTO issued office actions in connection 
with the Company's patent reexamination petitions filed against Sonus, 
Nycomed and ImaRx. The PTO office actions rejected all relevant claims of 
these patents based on prior art not previously disclosed to the PTO by 
Sonus, Nycomed or ImaRx during prosecution of their patent applications.  In 
June 1998, the PTO issued a final rejection of all claims of the two Sonus 
patents involved in the Sonus Case.  If the PTO's rejection is maintained on 
any appeal subsequently filed by Sonus, the two Sonus patents will be 
invalid.  If the PTO rejection of the Nycomed patent is maintained through 
further proceedings before the patent examiner and on any appeal, the PTO 
rejection will invalidate the patent which Nycomed is attempting to assert 
against the Company and Mallinckrodt to block the manufacture and sale of 
OPTISON.

  Litigation or administrative proceedings relating to these matters could 
result in a substantial cost to the Company; and given the complexity of the 
legal and factual issues, the inherent vicissitudes and uncertainty of 
litigation, and other factors, there can be no assurance of a favorable 
outcome.  An unfavorable outcome could have a material adverse effect on the 
Company's business, financial condition and results of operations.  Moreover, 
there can be no assurance that, in the event of an unfavorable outcome, the 
Company would be able to obtain a license to any proprietary rights that may 
be necessary to commercialize OPTISON, either on acceptable terms or at all.  
If the Company were required to obtain a license necessary to commercialize 
OPTISON, the Company's failure or inability to do so would have a material 
adverse effect on the Company's business, financial condition and results of 
operations.

ITEM 4.        SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

  None.

EXECUTIVE OFFICERS OF THE REGISTRANT

                                       19

<PAGE>

  The following information concerning the names, ages and titles of the 
Company's executive officers as of the date of this report, is included in 
accordance with General Instruction G(3) of Form 10-K:
<TABLE>
<CAPTION>
     NAME                             AGE     POSITION
  
    <S>                               <C>    <C>
     Kenneth J. Widder, M.D. . . . .   45     Chairman of the Board
     Bobba Venkatadri. . . . . . . .   54     President and Chief Executive Officer
     Gerard A. Wills . . . . . . . .   41     Vice President, Finance and Chief 
                                              Financial Officer
     Thomas Jurgensen. . . . . . . .   41     Vice President, Legal and General Counsel
     William I. Ramage, D. Phil. . .   44     Vice President, Marketing
     Howard Dittrich, M.D. . . . . .   44     Vice President, Research/Medical &
                                              Regulatory Affairs
     Joni Harvey . . . . . . . . . .   44     Vice President, Operations
</TABLE>

     KENNETH J. WIDDER, M.D., a founder of the Company, has served as the 
Company's Chairman of the Board since July 1981. Prior to May 1997, Dr. 
Widder also served as the Company's Chief Executive Officer.  He currently 
serves as a director of Titan Pharmaceuticals, Wilshire Technologies, and 
Digivision, Inc.

     BOBBA VENKATADRI has served as the Company's President and Chief 
Executive Officer since May 1997.  He served as the Company's President and 
Chief Operating Officer from October 1995 until May 1997.  Mr. Venkatadri 
served as Executive Vice President of the Pharmaceutical Division of 
Centocor, Inc., from September 1992 until he joined the Company, and as Vice 
President - Operations of Centocor's Pharmaceutical Division from March 1992 
to September 1992.  He was employed by Warner-Lambert Company from 1967 until 
February 1992, most recently serving as Senior Director, Pharmaceutical 
Operations, at its manufacturing facility in Vegabaja, Puerto Rico.

     GERARD A. WILLS has served as the Company's Vice President, Finance and 
Chief Financial Officer since January 1995.  He served as the Company's Chief 
Financial Officer from August 1994 to January 1995 and as its Controller from 
February 1993 to August 1994.  From 1990 until joining the Company in 
February 1993, Mr. Wills served as the Corporate Manager of Finance for 
Maxwell Laboratories, Inc.  From 1986 through 1990, Mr. Wills was employed by 
Intermark, Inc. where he last served as the Corporate Controller.

     THOMAS E. JURGENSEN, ESQ. has served as the Company's Vice President of 
Legal and General Counsel since December of 1997.  From 1993 to 1997, he was 
employed by Ligand Pharmaceuticals, initially as the Assistant General 
Counsel, then as the Associate General Counsel.  He served as an Intellectual 
Property Counsel at the 3M Company from 1991 to 1993, and was an associate at 
the firm of Merchant and Gould from 1989 to 1991.

     WILLIAM I. RAMAGE, D. PHIL., has served as the Company's Vice President 
- - Marketing since September 1996.  From 1979 to 1996, he was employed by 
DuPont Merck Pharmaceutical Company where he served as Vice President of 
Business Development and Customer Services of the Radiopharmaceutical 
Division from 1995 to 1996 and Director of Business Segments from 1994 to 
1995.  From 1979 to 1994, he served in other management positions with DuPont 
Merck in Billerica, MA, Houston, TX and Wilmington, DE.

     HOWARD DITTRICH, M.D., has served as the Company's Vice President 
- - Research/Medical & Regulatory Affairs since November 1996.  He served as the 
Company's Executive Director of Medical Affairs from May 1996 to November 
1996. He served as a Consultant to the Company from 1989 to 1996.  Dr. 
Dittrich was a full-time faculty member of the University of California, San 
Diego, Department of Medicine from 1984 to May 1996.  Currently, Dr. Dittrich 
practices part-time with the University of California, San Diego where he 
holds an appointment as Clinical Professor of Medicine.

     JONI HARVEY has served as Vice President of Operations since April 1998. 
She served as the Company's Executive Director of Operations from November 
1996 to April 1998. From September 1995 to November 1996, she served as 
Director of Manufacturing.  Ms. Harvey served with Genzyme from February 1995 
until rejoining the

                                       20

<PAGE>

Company in September 1995.  From March 1994 to January 1995, Ms. Harvey was 
Associate Director of Manufacturing for the Company.  She originally joined 
the Company in October 1988 as Manager of Manufacturing. From 1980 until 
October 1988, Ms. Harvey held various supervisory positions in Quality and 
Manufacturing with Baxter Healthcare.


                                       21

<PAGE>
                                          
                                      PART II

ITEM 5.   MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS
     
     The Company's Common Stock is traded on the New York Stock Exchange under
the symbol "MB."  As of June 16, 1998, there were approximately 1,719 holders of
record of the Company's Common Stock, representing approximately 10,679
beneficial owners.  The Company has not paid dividends on its Common Stock.  The
following table sets forth the quarterly high and low last sale price for a
share of the Company's Common Stock for the three fiscal years ended March 31,
1998, 1997, and 1996, respectively, as reported by the New York Stock Exchange.

<TABLE>
<CAPTION>
<S>                                                <C>               <C>

FISCAL 1998                                             HIGH            LOW
                                                    --------        -------

First Quarter (4/1 to 6/30)                               10          6-5/8
Second Quarter (7/1 to 9/30)                        11-15/16         8-5/16
Third Quarter (10/1 to 12/31)                         12-3/8          7-7/8
Fourth Quarter (1/1 to 3/31)                          10-3/4          7-1/8


FISCAL 1997                                             HIGH            LOW
                                                    --------        -------

First Quarter (4/1 to 6/30)                           11-7/8          8-1/2
Second Quarter (7/1 to 9/30)                           9-1/8          7-1/2
Third Quarter (10/1 to 12/31)                          8-3/4          6-1/2
Fourth Quarter (1/1 to 3/31)                          14-1/2              7


FISCAL 1996                                             HIGH            LOW
                                                    --------        -------

First Quarter (4/1 to 6/30)                                8          6-1/4
Second Quarter (7/1 to 9/30)                              10          6-1/4
Third Quarter (10/1 to 12/31)                          9-1/2              6
Fourth Quarter (1/1 to 3/31)                              10          6-3/8
</TABLE>

                                      22

<PAGE>

ITEM 6.   SELECTED FINANCIAL DATA

<TABLE>
<CAPTION>
<S>                                            <C>           <C>            <C>           <C>              <C>   

Selected Financial Data
FISCAL YEARS ENDED MARCH 31,                      1994           1995           1996           1997           1998
- ----------------------------                  ---------------------------------------------------------------------
(In thousands, except per share data)

Consolidated Statement of Operations Data:
Revenues:
   Revenues under collaborative
      Agreements                               $  5,713      $  15,132       $  2,412       $  4,500       $  5,095
   Product and royalty revenues                   1,056          1,769            647            626          1,151
   License Fees                                   2,015             40             25          5,725              -
                                              ---------------------------------------------------------------------
      Total Revenues                              8,784         16,941          3,084         10,851          6,246
Operating expenses:
   Research and development costs                18,110         18,743         13,588          9,902         11,078
   Costs of products sold                           580          1,608          1,553          4,748          5,791
   Selling, general and
      administrative expenses                     5,743          5,864          5,862          8,052         11,912
   Other nonrecurring charges                     4,726          3,403          3,110          3,000              -
                                              ---------------------------------------------------------------------
      Total Expenses                             29,159         29,618         24,113         25,702         28,781
Loss from operations                            (20,375)       (12,677)       (21,029)       (14,851)       (22,535)
Interest expense                                   (327)          (694)          (786)          (810)          (721)
Interest income                                   1,902          1,189          1,102          2,377          1,996
(Provision) credit for income taxes                   -              -              -              -              -
                                              ---------------------------------------------------------------------
Net loss                                     $  (18,800)    $  (12,182)    $  (20,713)    $  (13,284)    $  (21,260)
                                              ---------------------------------------------------------------------
                                              ---------------------------------------------------------------------
Loss per common share - Basic and diluted      $  (1.58)      $  (1.02)      $  (1.62)      $  (0.78)      $  (1.19)
                                              ---------------------------------------------------------------------
                                              ---------------------------------------------------------------------
Weighted average common
   Shares outstanding                            11,905         11,999         12,758         16,926         17,793

AS OF MARCH 31,                                    1994           1995           1996           1997           1998
- --------------                                ---------------------------------------------------------------------

Consolidated Balance Sheet Data:
Cash, cash equivalents and
   marketable securities                      $  29,500      $  19,718      $  20,570      $  41,414      $  21,338
Working capital                                  28,117         20,927         18,601         43,843         21,066
Total assets                                     56,051         50,639         43,829         70,159         51,318
Long-term debt                                    3,917          8,408          8,610          7,349          6,082
Total stockholders' equity                       48,076         36,424         28,962         51,746         31,164

</TABLE>


ITEM 7.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
          RESULTS OF OPERATIONS
                                          
      (REFERENCES TO YEARS ARE TO THE COMPANY'S FISCAL YEARS ENDED MARCH 31.)

OVERVIEW
                                      23
<PAGE>
  Molecular Biosystems, Inc. (the "Company") is a leader in the development,
manufacture and sale of ultrasound contrast imaging agents. These contrast
agents are used primarily to improve the real-time images ("moving pictures") of
organs and body structures, especially the heart, obtained through ultrasound
examinations.  The Company's products are designed to increase the diagnostic
usefulness of ultrasound examinations through enhanced visualization of
structures and vasculature, and to reduce the need for diagnostic procedures
that may be more expensive, time-consuming, or invasive.

  The Company is the first and only company to obtain marketing approval from
the United States Food and Drug Administration ("FDA") for ultrasound contrast
agents, having gained approvals for ALBUNEX-Registered Trademark- in 1994 and
OPTISON-TM-_ (the Company's second-generation agent) in 1997.  In May 1998,
OPTISON received final marketing authorization by the European Agency for the
Evaluation of Medicinal Products ("EMEA") for use in patients with suspected or
known cardiovascular disease.  The authorization covers all 15 member states of
the European Union. 
 
  OPTISON, a significant improvement over ALBUNEX in terms of efficacy, is 
used to detect heart disease by assessing blood flow within the heart 
chambers and by identifying the location of the chamber borders and the 
movement of the chamber walls ("cardiac function"). To increase the potential 
applications of OPTISON, MBI is conducting Phase 2 clinical trials to 
evaluate the product's efficacy in determining whether the heart muscle is 
receiving an adequate blood supply ("myocardial perfusion").  The multiple 
Phase 2 trials include use of OPTISON in the emergency room for patients 
presenting with chest pain, and in various forms of stress echocardiography.  
Results using OPTISON in each of these applications suggest a close agreement 
with nuclear SPECT imaging for the detection of ischemia by wall motion and 
perfusion.  Furthermore, the results indicate that use of OPTISON could help 
to "rescue" a large proportion of uninterpretable non-contrast studies, 
thereby reducing the need for additional, more expensive and time consuming 
testing.  The Company believes the information regarding perfusion will 
enable cardiologists to diagnose heart attacks and coronary artery disease 
more accurately and safely than is currently feasible. MBI is also conducting 
Phase 2 clinical studies using OPTISON to detect abnormalities in other 
organs, such as the liver.

  Operating losses may occur for at least the next several years due to
continued requirements for research and development including preclinical
testing and clinical trials, regulatory activities and the costs of
commercializing new products. The magnitude of the losses and the time required
by the Company to achieve profitability are highly dependent on the market
acceptance of OPTISON and are therefore uncertain. There can be no assurance
that the Company will be able to achieve profitability on a sustained basis or
at all. Results of operations may vary significantly from quarter to quarter
depending on, among other things, the progress, if any, of the Company's
research and development efforts, the timing of milestone payments, the timing
of certain expenses and the establishment of collaborative research agreements.

REVENUE RECOGNITION

  Historically the Company has earned revenues from three primary sources:
revenues under collaborative agreements, product revenues and license fee
revenues.

  REVENUES UNDER COLLABORATIVE AGREEMENTS.  Revenues under collaborative
agreements have been the primary source of revenues for the Company in the past.
They consist of two types of revenues: (i) milestone payments which are earned
on the achievement of certain product development and territorial milestones,
(ii) payments received from Mallinckrodt, Inc. ("Mallinckrodt") under the
Company's Amended and Restated Distribution Agreement ("ARDA") to support
clinical trials, regulatory submissions and product development.

  PRODUCT AND ROYALTY REVENUES.  Product revenues are based upon the Company's
sales to Mallinckrodt and are recognized upon shipment of the product.  Product
revenues in 1996 and 1997 also included sales to Shionogi & Co., Ltd.
("Shionogi"). The transfer prices for the Company's sales of ALBUNEX to
Mallinckrodt and Shionogi were determined under the respective agreements and
were approximately equal to 40% of Mallinckrodt's average net sales price to its
end users of the product and 30% of Shionogi's net sales to its end users.
 
  The transfer price for the Company's sales of OPTISON to Mallinckrodt is
approximately equal to 40% of Mallinckrodt's average net sales price to its end
users of the product for the immediately preceding quarter.  Pursuant to ARDA,
the average net sales price to end users is calculated by dividing the net sales
for the preceding quarter by the total number of units shipped to end users
whether paid for or shipped as samples.  Consistent with industry practice, the
Company considers samples a marketing expense and as such the cost of samples is
recorded as selling, general and administrative expense.

                                      24
<PAGE>
  Royalty revenues are pursuant to a licensing agreement between the Company and
Abbott Laboratories.
 
LICENSE FEES.  License fees are recognized at the time of receipt and are 
generally received in conjunction with the grant of product development, 
marketing, manufacturing and/or distribution rights to one of the Company's 
technologies.
 
IMPACT OF THE YEAR 2000 ISSUE

   The Company has conducted a comprehensive review of its computer systems 
to identify the systems that could be affected by the "Year 2000" issue and 
has implemented a plan to resolve the issue at a cost which is not expected 
to be material.  The Company is also in the process of doing a comprehensive 
review of its vendors, service providers, and collaborative partners and will 
address any issues that arise during this review.  The Year 2000 problem is 
the result of computer programs being written using two digits rather than 
four digits to define the applicable year.  Any of the Company's programs 
that have time-sensitive software may recognize a date using "00" as the year 
1900 rather than the year 2000.  This could result in a major system failure 
or miscalculations. The Company presently believes that the Year 2000 problem 
will not pose significant operational problems for the Company's computer 
systems.

RESULTS OF OPERATIONS

    FISCAL YEAR 1998 COMPARED TO FISCAL YEAR 1997.  Revenues under collaborative
agreements were $5.1 million for the fiscal year ended March 31, 1998, compared
to $4.5 million for the fiscal year ended March 31, 1997. This increase is
primarily due to an increase in the quarterly payments from Mallinckrodt to
$1.25 million over $1.0 million in the prior year's first two quarters.  These
revenues in both years consist of quarterly payments to support clinical trials,
regulatory submissions and product development received from Mallinckrodt under
ARDA. 
 
  Product and royalty revenues were $1.2 million for fiscal year 1998, compared
to $626,000 for the prior year.  Product revenues in the current year are based
on the Company's sales to Mallinckrodt and are recognized upon shipment of the
product.  Product revenues in 1997 also included sales to Shionogi, also
recognized upon shipment of the product.  The increase in product revenues for
fiscal year 1998 as compared to fiscal year 1997 results primarily from the
market introduction of OPTISON in the fourth quarter which added revenues of
approximately $700,000.  Royalty revenues are pursuant to a license agreement
between the Company and Abbott Laboratories.
 
  There were no license fees in fiscal year 1998 compared to $5.7 million in
fiscal year 1997.  The revenues in the prior year consist of payments from
Mallinckrodt pursuant to an amendment to ARDA that the Company entered into with
Mallinckrodt in December 1996.  The amendment extended Mallinckrodt's exclusive
territory to include the territory that the Company had formerly licensed to
Nycomed Imaging AS ("Nycomed") consisting of Europe, Africa, India and parts of
Asia.
 
  Costs of products sold totaled $5.8 million for fiscal year 1998, resulting in
a negative gross profit margin.  This negative gross profit margin was due to
the fact that the current low levels of production are insufficient to cover the
Company's fixed manufacturing overhead expenses. For fiscal year 1997, costs of
products sold totaled $4.7 million.  The Company anticipates an increase in
gross profit margins if and when OPTISON sales volumes increase as OPTISON
obtains market acceptance.   The increase in sales volume would permit the fixed
costs included in manufacturing overhead to be allocated over a larger number of
vials produced.  Manufacturing fixed costs are currently running at an annual
rate of approximately $5.5 million.  The amount of any increase in the Company's
margins and the time required by the Company to achieve higher margins are
highly dependent on the regulatory approval and market acceptance of current and
future products and are therefore uncertain.
 
  The Company's research and development costs totaled $11.1 million for fiscal
year 1998 as compared to $9.9 million for fiscal year 1997.  The increase of 12%
is due to additional research and development costs associated with the
Company's product development efforts.

  Selling, general and administrative expenses totaled $11.9 million in fiscal
year 1998 as compared to $8.1 million in fiscal year 1997.  This increase of 47%
is primarily due to increased legal expenses.
 
  During fiscal year 1998, the Company did not incur other nonrecurring charges
compared to $3 million for the prior year related to the reacquisition of
license rights from Nycomed.
                                        25
<PAGE>
  Interest expense for fiscal years 1998 and 1997 amounted to $721,000 and
$810,000, respectively. Interest expense consists of mortgage interest on the
Company's manufacturing building and interest related to a note payable, secured
by the tangible assets of the Company, which bears interest at the prime rate
plus 1% and is payable in monthly installments of principal plus interest over
five years. The interest rate on the note was 9.5% in March 1998.
 
  Interest income for fiscal year 1998 was $2.0 million compared to $2.4 million
in fiscal year 1997. This decrease is due to lower average cash balances and
marketable securities balances.
 
  No tax benefit has been recognized for fiscal years 1998 or 1997 as the
Company had fully utilized its operating loss carryback ability in 1993. As of
March 31, 1998, the Company had federal and state operating loss carryforwards
of approximately $90.5 million and $27.2 million, respectively.  Realization of
future tax benefits from utilization of net operating loss carryforwards is
uncertain.

  FISCAL YEAR 1997 COMPARED TO FISCAL YEAR 1996.  Revenues under collaborative
agreements were $4.5 million for the fiscal year ended March 31, 1997, compared
to $2.4 million for the fiscal year ended March 31, 1996. This increase was due
to the receipt in 1997 of 4 quarterly payments from Mallinckrodt to support
clinical trials versus 2 quarterly payments in 1996. The revenues in 1997
consisted solely of quarterly payments to support clinical trials, regulatory
submissions and product development received from Mallinckrodt under ARDA.
 
  Product and royalty revenues were $626,000 for fiscal year 1997, compared to
$647,000 for 1996.  Product revenues were based on the Company's sales to
Mallinckrodt and Shionogi and were recognized upon shipment of the product. 
Royalty revenues were pursuant to a license agreement between the Company and
Abbott Laboratories.
 
  License fees were $5.7 million and $25,000 in fiscal year 1997 and 1996,
respectively.  License fee revenues in fiscal year 1997 consisted of payments
from Mallinckrodt pursuant to the amendment to ARDA that the Company entered
into with Mallinckrodt in December 1996.
 
  Costs of products sold totaled $4.7 million for fiscal year 1997, resulting in
a negative gross profit margin.  This negative gross profit margin was due to
the fact that the low levels of production were insufficient to cover the
Company's fixed manufacturing overhead expenses.  For the fiscal year ended
March 31, 1996, costs of products sold totaled $1.6 million. In fiscal year
1996, certain expenses related to the development of the manufacturing process
were recorded as research and development costs. Because the Company had left
the pilot manufacturing phase, these costs were classified as costs of goods
sold in fiscal 1997.
 
  The Company's research and development costs totaled $9.9 million for the year
ended March 31, 1997 as compared to $13.6 million for the year ended March 31,
1996.  The decrease of 27% was due to the classification in fiscal year 1996 of
certain expenses associated with the manufacturing of the product as research
and development costs as they represented the cost of developing the Company's
manufacturing process.

  Selling, general and administrative expenses totaled $8.1 million in fiscal
year 1997 as compared to $5.9 million in fiscal year 1996.  This increase was
due in part to increased litigation expenses in addition to increased
compensation costs.
 
  During fiscal year 1997, the Company's other nonrecurring charges totaled 
$3 million as compared to $3.1 million for the prior year.  In December 1996, 
the Company and Mallinckrodt amended ARDA to expand the geographical scope of 
Mallinckrodt's exclusive marketing and distribution rights for ALBUNEX, 
OPTISON and related products to include the territory the Company had 
previously licensed to Nycomed.  As a result of the amendment, the Company 
recorded a one-time charge of $3 million related to the reacquisition of its 
license rights from Nycomed.  In fiscal year 1996, the Company recorded 
one-time charges related to the conclusion of arbitration with Bracco S.p.A., 
the write off of license fees associated with discontinued products and a 
write down to the sale price of two buildings that were subsequently sold in 
March 1996.
 
  Interest expense for fiscal years 1997 and 1996 amounted to $810,000 and
$786,000, respectively. Interest expense consisted of mortgage interest on the
Company's manufacturing building and interest related to a note payable which
bears interest at prime plus 1% and is payable in monthly installments of
principal plus interest over five years. The interest rate on the note was 9.50%
in March 1997.
                                      26
<PAGE>

  Interest income for fiscal year 1997 was $2.4 million compared to $1.1 million
in fiscal year 1996. This significant increase was due to the interest earned
related to higher average cash balances and marketable securities balances as a
result of the Company's public offering in May 1996.
 
  No tax benefit was recognized for fiscal 1997 or 1996 as the Company had fully
utilized its operating loss carryback ability in 1993. As of March 31, 1997, the
Company had federal and state operating loss carryforwards of approximately
$84.4 million and $26.6 million, respectively.
 
LIQUIDITY AND CAPITAL RESOURCES

  At March 31, 1998, the Company had net working capital of $21.1 million
compared to $43.8 million at March 31, 1997.  Cash, cash equivalents and
marketable securities were $21.3 million at March 31, 1998 compared to $41.4
million at March 31, 1997.

  In an agreement dated March 31, 1998, the Company entered into a 
cooperative development and marketing agreement with Chugai Pharmaceutical 
Co., Ltd. ("Chugai") of Japan.  The parties entered into this strategic 
alliance which covers Japan, Taiwan and South Korea, to develop OPTISON 
(which may be marketed under a different name) and ORALEX, as well as related 
products.  The Company granted Chugai an exclusive license to develop, 
manufacture, and market these products in the subject territory, for which 
the Company received an upfront license fee of $14 million.  With respect to 
licensed products manufactured by Chugai, Chugai will pay the Company a 
royalty on net sales.  For licensed products manufactured by the Company, the 
Company will receive royalties on net sales, the amount of which will depend 
upon the sales volume, in addition to a transfer price based on average net 
sales per unit from the previous quarter. Additionally, Chugai purchased 
691,883 shares of the Company's common stock at a premium of 40% over the 
then-prevailing market price.  The equity investment was valued at $8.3 
million.  The Company is also eligible to receive milestone payments of up to 
$20 million based on Chugai's achievement of certain Japanese product 
development and regulatory goals. 

  During fiscal year 1998, the Company used $17.5 million cash for operating
requirements, which was funded primarily by $20.6 million of marketable
securities that matured during fiscal 1998.  Significant cash uses included an
increase in inventories of $1.6 million principally related to the commercial
launch of OPTISON in the U.S. and Europe, purchases of property and equipment of
$1.4 million, and $2.0 million for the reacquisition of license rights from
Shionogi.  Cash was provided primarily by $1.3 million in proceeds from a
sale/leaseback transaction related to equipment financing, receipt of $1.6
million in contract revenue from Chugai, an increase of $2.8 million in accounts
payable and accrued liabilities related to research and development activity for
future products and an increase in legal activity.
 
  On September 7, 1995, the Company entered into an Amended and Restated
Distribution Agreement ("ARDA") and a related investment agreement with
Mallinckrodt which will provide the Company with between $33.0 million and $42.5
million. Under the terms of the agreement, Mallinckrodt is obligated to make
payments to the Company totaling $20.0 million over four years to support
clinical trials, related regulatory submissions and associated product
development of the licensed products, which include, but are not limited to,
ALBUNEX and OPTISON. These payments will be made in 16 quarterly installments of
$1.0 million for the first four quarters, $1.25 million for the following eight
quarters and $1.5 million for the final four quarters. The payments may be
accelerated in the event that the Company's cumulative outlays for clinical
trials are in excess of the amounts received at any point in time. However, the
quarterly payments may not be postponed. The first 11 quarterly payments have
been received by the Company.

  In September 1996, the Company entered into an agreement with Shionogi
pursuant to which the Company reacquired all rights to manufacture, market and
sell its ALBUNEX family of products in the territory, consisting of Japan,
Taiwan and South Korea, formerly exclusively licensed to Shionogi.  Under the
agreement, the company paid $3 million to Shionogi and agreed to pay an
additional $5.5 million over the next three years, of which $2 million had been
paid at March 31, 1998.

  Capital expenditures for facilities, laboratory equipment, furniture and
fixtures were $1.4 million, $726,000, and $2.4 million for fiscal years 1998,
1997 and 1996, respectively.  Expenditures in all three fiscal years consisted
primarily of building improvements and equipment for aseptic manufacturing
facilities being constructed for the manufacture of OPTISON and other products. 
In June 1997, the Company entered into an equipment leasing agreement with
Mellon US Leasing ("Mellon") for a lease line of $1.6 million with a term of 48
months.  The outstanding balance on this line of credit at March 31, 1998 was
$1.3 million.
                                      27
<PAGE>
  The Company currently leases one of its operating facilities in San Diego. The
lease requires aggregate payments of approximately $648,000 through fiscal year
2000.

  For the next several years, the Company expects to incur substantial
additional expenditures associated with product development.  The Company
anticipates that its existing resources, plus payments under its collaborative
agreements, will enable the Company to fund its operations for at least the next
18 months. The Company continually reviews its product development activities in
an effort to allocate its resources to those products that the Company believes
have the greatest commercial potential. Factors considered by the Company in
determining the products to pursue may include, but are not limited to, the
projected markets, potential for regulatory approval, technical feasibility,
intellectual property rights and estimated costs to bring the product to the
market. Based upon these factors, the Company may from time to time reallocate
its resources among its product development activities. The Company may pursue a
number of options to raise additional funds, including borrowings; lease
arrangements; collaborative research and development arrangements; the licensing
of product rights to third parties; or additional public and private financing,
as capital requirements change as a result of strategic, competitive,
technological and regulatory factors. There can be no assurance that funds from
these sources will be available on favorable terms, if at all.

  The Company believes that inflation and changing prices have not had a
material effect on operations for fiscal years 1998, 1997 and 1996 and that the
impact of government regulation on the Company is not materially different from
the impact on other similar enterprises.
                                      28

<PAGE>

ITEM 8.   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

                                          
                     INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>

                                                                             PAGE
                                                                             ----
<S>                                                                          <S>

     Report of Independent Public Accountants                                  30
     Consolidated Balance Sheets as of March 31, 1997 and 1998                 31
     Consolidated Statements of Operations for the Fiscal Years Ended 
     March 31, 1996, 1997 and 1998                                             32
     Consolidated Statements of Stockholders' Equity for the Fiscal Years 
     Ended March 31, 1996, 1997 and 1998                                       33
     Consolidated Statements of Cash Flows for the Fiscal Years Ended 
     March 31, 1996, 1997 and 1998                                             34
     Notes to Consolidated Financial Statements                                35
               
</TABLE>

                                          

ITEM 9.   CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
          FINANCIAL DISCLOSURE

     None.


                                       29
<PAGE>



                                       
                   REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To Molecular Biosystems, Inc.:

     We have audited the accompanying consolidated balance sheets of 
Molecular Biosystems, Inc. (a Delaware corporation) and subsidiaries as of 
March 31, 1997 and 1998, and the related consolidated statements of 
operations, stockholders' equity and cash flows for each of the three years 
in the period ended March 31, 1998. These financial statements are the 
responsibility of the Company's management. Our responsibility is to express 
an opinion on these financial statements based on our audits.

     We conducted our audits in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement. An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements. 
An audit also includes assessing the accounting principles used and 
significant estimates made by management, as well as evaluating the overall 
financial statement presentation. We believe that our audits provide a 
reasonable basis for our opinion.

     In our opinion, the financial statements referred to above present 
fairly, in all material respects, the financial position of Molecular 
Biosystems, Inc. and subsidiaries as of March 31, 1997 and 1998, and the 
results of their operations and their cash flows for each of the three years 
in the period ended March 31, 1998, in conformity with generally accepted 
accounting principles.

                                          
                                             ARTHUR ANDERSEN LLP




San Diego, California
May 18, 1998



                                       30
<PAGE>

                                       
                 MOLECULAR BIOSYSTEMS, INC. AND SUBSIDIARIES
                         CONSOLIDATED BALANCE SHEETS
                            (DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                            MARCH 31,     MARCH 31,
                                                               1997         1998
<S>                                                         <C>           <C>
                                     ASSETS
Current assets:

     Cash and cash equivalents                               $  587        $  1,064
     Marketable securities, available-for-sale (Note 2)      40,827          20,274
     Accounts and notes receivable                              902           1,498
     License rights (Note 7)                                  8,500           8,500
     Inventories                                                342           1,902
     Prepaid expenses and other assets                          249             400
                                                          ---------       ---------
        Total current assets                                 51,407          33,638
                                                          ---------       ---------

Property and equipment, at cost:

     Building and improvements                               14,544          14,412
     Equipment, furniture and fixtures                        4,567           4,364
     Construction in progress                                   511             471
                                                          ---------       ---------
                                                             19,622          19,247
     Less:  Accumulated depreciation and amortization         6,434           7,073
                                                          ---------       ---------
         Total property and equipment                        13,188          12,174
                                                          ---------       ---------

Other assets:

     Patents and license rights, net of amortization 
       $1,114 and $87, respectively (Notes 5 and 8)             341             320
     Certificate of deposit, pledged (Notes 2 and 4)          3,000           3,000
     Other assets, net                                        2,223           2,186
                                                          ---------       ---------
         Total other assets                                   5,564           5,506
                                                          ---------       ---------
                                                          $  70,159       $  51,318
                                                          ---------       ---------
                                                          ---------       ---------

     LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
     Current portion of long-term debt                     $  1,267        $  1,272
     Accounts payable and accrued liabilities (Notes 1 
     and 5)                                                   4,684           7,498
     Compensation accruals                                    1,613           2,227
     Deferred Contract Revenue                                    -           1,575
                                                          ---------       ---------
         Total current liabilities                            7,564          12,572
                                                          ---------       ---------
     Long-term debt, net of current portion (Note 4)          7,349           6,082
                                                          ---------       ---------
     Other noncurrent liabilities                             3,500           1,500
                                                          ---------       ---------
     Commitments and contingencies (Note 5)
     Stockholders' equity (Note 6):
       Common Stock, $.01 par value, 40,000,000 shares
        Authorized, 17,745,897 and 17,846,237 shares
        Issued and outstanding, respectively                    177             178
       Additional paid-in capital                           127,483         128,145
       Accumulated deficit                                  (75,469)        (96,729)
       Unrealized loss on available-for-sale securities         (82)            (67)
       Less 40,470 shares of treasury stock, at cost           (363)           (363)
                                                          ---------       ---------
         Total stockholders' equity                          51,746          31,164
                                                          ---------       ---------
                                                          $  70,159       $  51,318
                                                          ---------       ---------
                                                          ---------       ---------

</TABLE>

  The accompanying notes are an integral part of these consolidated statements.

                                       31
<PAGE>

                                        
                   MOLECULAR BIOSYSTEMS, INC. AND SUBSIDIARIES
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)


<TABLE>
<CAPTION>

                                                               FISCAL YEARS ENDED MARCH 31,
                                                        ----------------------------------------
                                                             1996           1997           1998
<S>                                                      <C>            <C>            <C>
Revenues (Note 7):
     Revenues under collaborative agreements             $  2,412       $  4,500       $  5,095
     Product and royalty revenues                             647            626          1,151
     License fees                                              25          5,725              -
                                                         --------       --------       --------
                                                            3,084         10,851          6,246
                                                         --------       --------       --------
Operating expenses:
     Research and development costs (Note 7)               13,588          9,902         11,078
     Costs of products sold                                 1,553          4,748          5,791
     Selling, general and administrative expenses           5,862          8,052         11,912
     Other nonrecurring charges (Note 8)                    3,110          3,000              -
                                                         --------       --------       --------
                                                           24,113         25,702         28,781
                                                         --------       --------       --------

     Loss from operations                                 (21,029)       (14,851)       (22,535)
Interest expense                                             (786)          (810)          (721)
Interest income                                             1,102          2,377          1,996
                                                         --------       --------       --------
Net loss                                                 $(20,713)      $(13,284)      $(21,260)
                                                         --------       --------       --------
                                                         --------       --------       --------
Loss per common share - Basic and diluted                $  (1.62)      $  (0.78)      $  (1.19)
                                                         --------       --------       --------
                                                         --------       --------       --------
Weighted average common shares
     Outstanding                                           12,758         16,926         17,793
                                                         --------       --------       --------
                                                         --------       --------       --------
</TABLE>

   The accompanying notes are an integral part of these consolidated statements.

                                       32
<PAGE>


                                       
                  MOLECULAR BIOSYSTEMS, INC. AND SUBSIDIARIES
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                            (DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                   COMMON STOCK       ADDITIONAL
                                              COMPREHENSIVE   ----------------------    PAID-IN     ACCUMULATED    TREASURY
                                                  LOSS          SHARE      AMOUNT       CAPITAL       DEFICIT        STOCK
                                             ---------------  ---------  -----------  -----------  -------------  -----------
<S>                                          <C>              <C>        <C>          <C>          <C>            <C>
Balance at March 31, 1995                                     11,999,561  $     120    $  78,422     $ (41,472)    $     (59)
  Comprehensive Loss
    Net loss                                    $ (20,713)           --          --           --       (20,713)           --
    Unrealized gain on available-for-sale
      securities (Note 2)                             112            --          --           --            --            --
                                             ---------------  
  Comprehensive Loss                              (20,601)
                                             ---------------  
  Purchase of treasury stock (Note 6)                                --          --          (79)           --          (108)
  Issuance of shares in settlement of
    stockholder suit                                            172,414           2        1,498            --            --
  Proceeds from sale of Common Stock 
    (Note 7)                                                  1,118,761          11       11,591            --            --
  Exercise of stock options                                       5,450          --           36            --            --
                                                              ---------       -----   -----------  -------------       -----
Balance at March 31, 1996                                    13,296,186   $     133    $  91,468     $ (62,185)    $    (167)
  Comprehensive Loss
    Net loss                                      (13,284)           --          --           --       (13,284)           --
    Unrealized loss on available-for-sale
      securities (Note 2)                             (76)           --          --           --            --            --
                                             ---------------  
  Comprehensive Loss                              (13,360)
                                             ---------------  
  Proceeds from Public Offering                               4,140,000          41       34,045            --            --
  Purchase of treasury stock (Note 6)                                --          --          (85)           --          (196)
  Exercise of stock options                                     295,500           3        1,928            --            --
  Issuance of stock grants                                       14,211          --          127            --            --
                                                              ---------       -----   -----------  -------------       -----
Balance at March 31, 1997                                    17,745,897   $     177    $ 127,483     $ (75,469)    $    (363)
  Comprehensive Loss
    Net loss                                      (21,260)           --          --           --       (21,260)           --
    Unrealized gain on available-for-sale
      securities (Note 2)                              15            --          --           --            --            --
                                             ---------------  
  Comprehensive Loss                              (21,245)
                                             ---------------  
  Exercise of stock options                                     100,340           1          662            --            --
                                             ---------------  ---------       -----   -----------  -------------       -----
Balance at March 31, 1998                                    17,846,237   $     178    $ 128,145     $ (96,729)    $    (363)
                                                              ---------       -----   -----------  -------------       -----
                                                              ---------       -----   -----------  -------------       -----
 
<CAPTION>
                                                                     NOTES
                                             ACCUMULATED OTHER  RECEIVABLE FROM
                                               COMPREHENSIVE    SALE OF COMMON
                                               INCOME (LOSS)         STOCK         TOTAL
                                             -----------------  ---------------  ---------
<S>                                          <C>                <C>              <C>
Balance at March 31, 1995                        $    (118)        $    (469)    $  36,424
  Comprehensive Loss
    Net loss                                            --                --       (20,713)
    Unrealized gain on available-for-sale
      securities (Note 2)                              112                --           112
                                                     -----             -----     ---------
  Comprehensive Loss

  Purchase of treasury stock (Note 6)                   --               188             1
  Issuance of shares in settlement of
    stockholder suit                                    --                --         1,500
  Proceeds from sale of Common Stock 
    (Note 7)                                            --                --        11,602
  Exercise of stock options                             --                --            36
                                                     -----             -----     ---------
Balance at March 31, 1996                        $      (6)        $    (281)    $  28,962
  Comprehensive Loss
    Net loss                                            --                --       (13,284)
    Unrealized loss on available-for-sale
      securities (Note 2)                              (76)               --           (76)
                                                     -----             -----     ---------
  Comprehensive Loss

  Proceeds from Public Offering (Note 6)                --                --        34,086
  Purchase of treasury stock (Note 6)                   --               281            --
  Exercise of stock options                             --                --         1,931
  Issuance of stock grants                              --                --           127
                                                     -----             -----     ---------
Balance at March 31, 1997                        $     (82)        $      --     $  51,746
  Comprehensive Loss
    Net loss                                            --                --       (21,260)
    Unrealized gain on available-for-sale
      securities (Note 2)                               15                --            15
                                                     -----             -----     ---------
  Comprehensive Loss
                                                     -----             -----     ---------
  Exercise of stock options                             --                --           663
                                                     -----             -----     ---------
Balance at March 31, 1998                        $     (67)        $      --     $  31,164
                                                     -----             -----     ---------
                                                     -----             -----     ---------
</TABLE>
 
 The accompanying notes are an integral part of these consolidated statements.


                                       33

<PAGE>

     MOLECULAR BIOSYSTEMS, INC. AND SUBSIDIARIES
       CONSOLIDATED STATEMENTS OF CASH FLOWS
              (DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                             FISCAL YEARS ENDED MARCH 31,
                                                                             ----------------------------
<S>                                                                    <C>            <C>           <C>                

                                                                           1996           1997           1998
Cash flows from operating activities:

  Net loss                                                            $ (20,713)     $ (13,284)     $ (21,260)
  Adjustments to reconcile net loss to net cash 
      used in operating activities:
    Depreciation and amortization                                         2,217          1,435          1,085
    Loss on disposals/write-downs of property and equipment                 680              1             20
    Loss on write-off of license fees related to discontinued products    1,025              -              -
    Write-off of former Nycomed territory license rights                      -          3,000              -
    Forgiveness of note receivable from sale of Common Stock                 56            109              -
    Changes in operating assets and liabilities:
      Receivables                                                         4,863             29           (702)
      Inventories                                                           773            280         (1,560)
      Prepaid expenses and other assets                                      36           (623)           (45)
      Accounts payable and accrued liabilities                           (1,626)           721          2,814
      Deferred contract revenue                                               -              -          1,575
      Compensation accruals                                                 620            582            614
                                                                      ----------      ----------      --------
      Cash used in operating activities                                 (12,069)        (7,750)       (17,459)
                                                                      ----------      ----------      --------

Cash flows from investing activities:

  Purchases of property and equipment                                    (2,397)          (726)        (1,387)
  Proceeds from sale of property and equipment                            6,484              4              -
  Write off of patents and license rights                                     -              -             17
  Additions to patents and license rights                                (1,045)          (226)           (32)
  Acquisition of license rights from Shionogi                                 -         (3,000)        (2,000)
  Acquisition of license rights from Nycomed                                  -         (2,000)             -
  (Increase) decrease in other assets                                       (28)          (269)            37
  (Increase) decrease in marketable securities                            4,920        (32,876)        20,569
                                                                      ----------      ----------      --------
      Cash provided by (used for) investing activities                    7,934        (39,093)        17,204
                                                                      ----------      ----------      --------

Cash flows from financing activities:
                     
  Proceeds from sale/leaseback transaction                                    -              -          1,331
  Net proceeds from public offering of Common Stock                           -         34,086              -
  Net proceeds from issuance of Common Stock                             11,638          2,058            663
  Long-term debt proceeds                                                 1,438              -              -
  Principal payments on long-term debt                                     (281)        (1,256)        (1,262)
                                                                      ----------      ----------      --------
      Cash provided by financing activities                              12,795         34,888            732
                                                                      ----------      ----------      --------
Increase (decrease) in cash and cash equivalents                          8,660        (11,955)           477

Cash and cash equivalents, beginning of year                              3,882         12,542            587
                                                                      ----------      ----------      --------
Cash and cash equivalents, end of year                                $  12,542         $  587       $  1,064
                                                                      ----------      ----------      --------
                                                                      ----------      ----------      --------

Supplemental cash flow disclosures:
  Interest income received                                             $  1,141       $  1,609       $  2,101
                                                                      ----------      ----------      --------
                                                                      ----------      ----------      --------
  Interest paid                                                        $    780       $    804       $    715
                                                                      ----------      ----------      --------
                                                                      ----------      ----------      --------
    The accompanying notes are an integral part of these consolidated statements.
</TABLE>
                              
                                      34
<PAGE>

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.   ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     DESCRIPTION OF BUSINESS-

     Molecular Biosystems, Inc. ("MBI" or the "Company") discovers, develops 
     and manufactures proprietary diagnostic ultrasound imaging agents.  The 
     Company's continuing operations have been unprofitable since 1992.  
     Operating losses may occur for at least the next several years due to 
     continued requirements for research and development, including 
     preclinical testing and clinical trials, regulatory activities and the 
     high costs of commercialization activities.  The magnitude of the losses 
     and the time required by the Company to achieve profitability are highly 
     dependent on the market acceptance of OPTISON-TM-_and other future 
     products and are therefore uncertain.  The Company does not foresee 
     product revenues from sales of ALBUNEX-Registered Trademark-, the 
     Company's first product and the first ultrasound imaging agent available 
     in the United States, as resulting in profitable operations for the 
     Company.  There is no assurance that the Company will be able to achieve 
     profitability on a sustained basis or at all.

     PRINCIPLES OF CONSOLIDATION-

     The Consolidated Financial Statements include the accounts of Molecular 
     Biosystems, Inc. and its wholly owned subsidiaries.  All significant 
     intercompany accounts and transactions have been eliminated. 

     Certain amounts in the prior years' financial statements and notes have 
     been reclassified to conform with the current year presentation.

     USE OF ESTIMATES-

     The preparation of financial statements in conformity with generally 
     accepted accounting principles requires management to make estimates and 
     assumptions that affect the reported amounts of assets and liabilities 
     and disclosure of contingent assets and liabilities at the date of the 
     financial statements and the reported amounts of revenues and expenses 
     during the reported period.  Actual results could differ from those 
     estimates.

     RESEARCH AND DEVELOPMENT COSTS-

     All research and development costs and related special purpose equipment 
     costs are charged to expense as incurred.

     REVENUES UNDER COLLABORATIVE AGREEMENTS-

     Revenues under collaborative agreements, which have been the primary source
     of revenues for the Company, consist of two types of revenues.  The first
     type, milestone payments, is earned in connection with research activities
     performed under the terms of research and development license agreements. 
     Revenue is recognized on the achievement of certain milestones, some of
     which relate to obtaining regulatory approvals.  Accordingly, the estimated
     dates of the milestone achievements are subject to revision based on
     periodic evaluations by the Company and its partners of the attainment of
     specified milestones, including the status of the regulatory approval
     process.  Advance payments received in excess of amounts earned are
     classified as deferred contract revenues and the resulting revenues are
     recognized based on work performed at a predetermined rate or level of
     expense reimbursement.

     Additionally, under the terms of the Amended and Restated Distribution
     Agreement ("ARDA") entered into in September 1995, Mallinckrodt, Inc.
     ("Mallinckrodt") will pay the Company $20.0 million over four years to
     further the development of OPTISON (the Company's second-generation
     product) and related products.  These payments will be made in 16 quarterly
     installments starting at $1.0 million for the first four quarters, $1.25
     million for the following eight quarters and $1.5 million for the final
     four quarters. Pursuant to the agreement, half of each payment is
     designated for clinical development expenses and will be recorded as
     deferred revenue until such expenses are incurred, and the remaining half
     of each payment will be recognized as research revenue when received. 


                                       35
<PAGE>


     REVENUE RECOGNITION FOR PRODUCT SOLD-

     The Company recognizes revenue when goods are shipped to its customer, 
     Mallinckrodt. The transfer price for the Company's sales of OPTISON to 
     Mallinckrodt is equal to 40% of Mallinckrodt's average net sales price 
     to its end users of the product for the immediately preceding quarter.  
     Pursuant to ARDA, the average net sales price to end users is calculated 
     by dividing the net sales for the preceding quarter by the total number 
     of units shipped to end users whether paid for or shipped as samples.  
     Consistent with industry practice, the Company considers samples a 
     marketing expense and as such the cost of samples is recorded as 
     selling, general and administrative expense.

     REVENUE RECOGNITION FOR LICENSE FEES-

     The Company recognizes revenue when license fees are received, provided 
     the Company has no future obligations.

     INCOME TAXES-

     The Company accounts for income taxes in accordance with Statement of 
     Financial Accounting Standards No. 109 (SFAS No. 109), "Accounting for 
     Income Taxes."  SFAS No. 109 is an asset and liability approach that 
     requires the recognition of deferred assets and liabilities for the 
     expected future tax consequences of events that have been recognized 
     differently in the Company's financial statements or tax returns.  
     Deferred tax assets are reduced by a valuation allowance when, in the 
     opinion of management, it is more likely than not that some portion or 
     all of the deferred tax assets will not be realized.

     CASH EQUIVALENTS-

     Cash equivalents include marketable securities with original maturities 
     of three months or less when acquired. The Company has not realized any 
     losses on its cash equivalents.

     MARKETABLE SECURITIES

     In accordance with Statement of Financial Accounting Standards ("SFAS") 
     No. 115, "Accounting for Certain Investments in Debt and Equity 
     Securities," the Company's management has classified its investment 
     securities as available-for-sale and records holding gains or losses as 
     a separate component of stockholders' equity. 

     CONCENTRATION OF CREDIT RISK-

     The Company invests its excess cash in debt instruments of financial 
     institutions and corporations with strong credit ratings.  The Company 
     has established guidelines relative to diversification and maturities 
     that maintain safety and liquidity.  These guidelines are periodically 
     reviewed and modified to take advantage of trends in yields and interest 
     rates.

     INVENTORIES-

     Inventories are stated at lower of cost (first-in, first-out) or market,
     and consist of the following major classes (in thousands):

<TABLE>
<CAPTION>
                                                                 MARCH 31,
                                                           --------------------
                                                             1997         1998
             <S>                                           <C>        <C>
             Raw materials and supplies                    $  253      $ 1,639
             Work in process                                   45           74
             Finished goods                                    44          189
                                                           ------      -------
                                                           $  342      $ 1,902
                                                           ------      -------
                                                           ------      -------
</TABLE>

     Work in process and finished goods include the cost of materials, direct
     labor and manufacturing overhead.

     PROPERTY AND EQUIPMENT-

     Property and equipment are stated at cost.  Depreciation and amortization
     are provided using the straight-line method over estimated useful lives of
     five years for equipment, 31 years for buildings and improvements and the
     term of the lease for leasehold improvements. 


                                       36
<PAGE>


     PATENTS AND LICENSE RIGHTS AND OTHER ASSETS-

     Patents and license rights are amortized on the straight-line method 
     over their estimated useful lives of five to ten years.

     In June 1989, the Company prepaid $2.0 million in royalties on the first 
     $66.6 million of sales of ALBUNEX and OPTISON in the United States.  
     Included in other assets at March 31, 1997 and 1998 is approximately 
     $1.9 million which is the portion of this prepayment which has not yet 
     been expensed.  Additionally, other assets at March 31, 1997 and 1998 
     include $300,000 of real estate investment related to an employment 
     agreement with one of the Company's officers.

     The Company periodically reevaluates the original assumptions and 
     rationale utilized in the assessment of the carrying value and estimated 
     lives of these and other long-lived assets.  The determinants used for 
     this evaluation include management's estimate of the asset's ability to 
     generate positive income and cash flow as well as the strategic 
     significance of the respective assets.

     IMPAIRMENT OF LONG-LIVED ASSETS-

     The Company accounts for long lived assets in accordance with Statement of
     Financial Accounting Standards No. 121, "Accounting for the Impairment of
     Long-Lived Assets and for Long-Lived Assets to be Disposed Of" (SFAS 121). 
     The statement requires that long-lived assets and certain identifiable
     intangibles to be held and used by an entity be reviewed for possible
     impairment whenever events or changes in circumstances indicate that the
     carrying amount of an asset may not be fully recoverable.

     ACCOUNTS PAYABLE AND ACCRUED LIABILITIES-

     Accounts payable and accrued liabilities consist of the following major
     classes (in thousands):

<TABLE>
<CAPTION>
                                                            MARCH 31,
                                                     ---------------------
                                                        1997         1998
     <S>                                             <S>          <C>
     Accrued legal and professional fees               1,250        1,540
     License rights payable and related fees (Note 7)  2,000        2,000
     Accounts payable - trade                          1,162        3,394
     Other miscellaneous accruals                        272          565
                                                      ------       ------
                                                     $ 4,684      $ 7,499
                                                      ------       ------
                                                      ------       ------

</TABLE>

     STOCK BASED COMPENSATION-

     The Company has elected to adopt the disclosure only provisions of 
     Statement of Financial Accounting Standards No. 123, "Accounting for 
     Stock-Based Compensation" (SFAS 123).  Accordingly the Company accounts 
     for its stock based compensation plans under the provisions of APB No. 
     25.

     LOSS PER SHARE-

     Basic and diluted loss per common share has been computed by dividing the
     loss by the weighted average number of common shares outstanding during the
     years.  Warrants and options do not impact the per share loss since they
     would be antidilutive.  In March 1997, the Financial Accounting Standards
     Board issued Statement of Financial Accounting Standards No. 128, "Earnings
     per Share" (SFAS 128), which changes the method of calculating earnings per
     share.  SFAS 128 is effective for financial statements issued after
     December 15, 1997.  The earnings per share of the Company for the years
     ended March 31, 1996, 1997 and 1998 would not be materially different under
     SFAS 128 as that presented therein.


                                       37


<PAGE>
     COMPREHENSIVE INCOME-

     In June 1997, Statement of Financial Accounting Standards No. 130, 
     "Reporting Comprehensive Income," was issued.  The Company has adopted
     this standard which requires the display of comprehensive income and its
     components in the financial statements.  The Company has chosen to disclose
     Comprehensive Loss, which encompasses net loss and unrealized gains and
     losses on available-for-sale securities, in the Consolidated Statements of 
     Stockholders' Equity.  Prior years have been restated to conform to the 
     SFAS No. 130 requirements.


2.   MARKETABLE SECURITIES

     Investments are recorded at estimated fair market value, and consist 
     primarily of treasury securities, government agency securities and 
     corporate obligations.  The Company has classified all of its investments
     as available-for-sale securities. The following table summarizes available-
     for-sale securities at March 31, 1997 (in thousands):


<TABLE>
<CAPTION>
                                                        COST NET OF
                                                         PREMIUMS/       GROSS          GROSS        ESTIMATED
                                                         DISCOUNTS     UNREALIZED     UNREALIZED       FAIR
                                                         AMORTIZED       GAINS          LOSSES        VALUE
                                                       -------------   ----------     ----------    ----------
     <S>                                                <C>               <C>            <C>         <C>
     U.S. treasury securities and obligations
       of U.S. government agencies                         $   3,503     $      -        $   (8)     $   3,495
     Corporate obligations                                    37,406            -           (74)        37,332
                                                       -------------   ----------     ----------    ----------
     Marketable securities available-for-sale              $  40,909     $      -        $  (82)     $  40,827
                                                       -------------   ----------     ----------    ----------
                                                       -------------   ----------     ----------    ----------

</TABLE>


     The following table summarizes available-for-sale securities at March 31,
     1998 (in thousands):

<TABLE>
<CAPTION>

                                                        COST NET OF
                                                         PREMIUMS/       GROSS          GROSS        ESTIMATED
                                                         DISCOUNTS     UNREALIZED     UNREALIZED       FAIR
                                                         AMORTIZED       GAINS          LOSSES        VALUE
                                                       -------------   ----------     ----------    ----------
<S>                                                     <C>               <C>            <C>         <C>
     U.S. treasury securities and obligations
       of U.S. government agencies                         $   4,501     $      -        $   (6)      $  4,495
     Corporate obligations                                    15,840            -           (61)        15,779
                                                       -------------   ----------     ----------    ----------
     Marketable securities available-for-sale              $  20,341     $  -            $  (67)      $ 20,274
                                                       -------------   ----------     ----------    ----------
                                                       -------------   ----------     ----------    ----------

</TABLE>


     There were no gross realized gains or losses on sales of available-for-sale
     securities for the year ended March 31, 1998.

     The amortized cost and estimated fair value of debt and marketable
     securities at March 31, 1998, by contractual maturity, are shown below. 
     Expected maturities may differ from contractual maturities because the 
     issuers of the securities may have the right to prepay obligations without
     prepayment penalties.


<TABLE>
<CAPTION>
                                                                     COST LESS
                                                                     PREMIUMS/        ESTIMATED
                                                                     DISCOUNTS           FAIR
                                                                     AMORTIZED          VALUE
     <S>                                                             <C>              <C>
     Due in one year or less                                         $  17,665        $  17,601
     Due after one year through three years                              2,676            2,673
                                                                     ---------        ---------
                                                                     $  20,341        $  20,274
                                                                     ---------        ---------
</TABLE>



                                       38

<PAGE>

     At March 31, 1998 a $3 million certificate of deposit was held as a
     compensating balance under the Company's debt agreement (see note 4).

3.   INCOME TAXES

     As described in Note 1, the Company uses the asset and liability method of
     computing deferred income taxes in accordance with Statement of Financial
     Accounting Standards No. 109, "Accounting for Income Taxes."

     The effective income tax rate on the loss before income taxes differs from
     the statutory U.S. federal income tax rate as follows (in thousands):

<TABLE>
<CAPTION>

                                                                        FISCAL YEARS ENDED MARCH 31,
                                                                  --------------------------------------
                                                                       1996         1997        1998
              <S>                                                  <C>          <C>           <C>
              Computed statutory tax                               $(7,036)     $(4,517)      $(7,342)
              State income taxes                                    (1,270)        (843)       (1,275)
              Tax exempt interest                                      (74)         (29)          (64)
              Losses without income tax benefit                      8,376        5,362         8,634
              Other                                                      4           27            47
                                                                   --------     --------      --------
              Provision for income taxes                           $     -      $     -       $     -
                                                                   --------     --------      --------
</TABLE>


     At March 31, 1998, the Company has deferred tax assets of approximately 
     $38.3 million relating to the following tax loss carryforwards for income
     tax purposes (in thousands):


<TABLE>
<CAPTION>
                                                                                     EXPIRATION
                                                                        AMOUNT         DATES
                                                                    -----------      ----------
     <S>                                                            <C>               <C>
     Federal ($90,480) and state ($27,170) net operating losses     $  117,650        1998-2013
     Research and development credit - federal                           2,150        1998-2013
     Research and development credit - state                               976        1998-2013
     Alternative minimum tax credit                                        300        Indefinite

</TABLE>


     For financial reporting purposes, a valuation allowance has been recognized
     to offset the deferred tax assets related to the carryforwards.  If 
     realized, approximately $1.0 million of the tax benefit for those items 
     will be applied directly to paid-in capital, related to deductible expenses
     reported as a reduction of the proceeds from issuing common stock in 
     connection with the exercise of stock options.


4.   LONG-TERM DEBT

     Long-term debt consists of the following (in thousands):

<TABLE>
<CAPTION>

                                                                 MARCH 31,
                                                         ---------------------
                                                           1997         1998
             <S>                                         <C>          <C>
             Note payable - due 2004                     $  3,816     $  3,754
             Note payable - due 2001                        4,800        3,600
                                                         --------     --------
                                                            8,616        7,354
             Less - current portion                         1,267        1,272
                                                         --------     --------
                                                         $  7,349     $  6,082
                                                         --------     --------
                                                         --------     --------
</TABLE>

                                       39

<PAGE>

     The note payable due in 2004 bears interest at a variable rate based upon
     the weighted average Eleventh District cost of funds plus 2.35 percent.  
     The interest rate on this note is adjusted semi-annually and was 8 percent
     at March 31, 1997 and 1998.  The note is secured by the Company's 
     manufacturing facility and certain of the equipment contained therein and
     is payable in monthly installments of principal and interest. As of March
     31, 1998, maturities of this note in each of the next five fiscal years 
     are:   $72,000, $79,000, $85,000, $92,000 and $100,000.

     The note payable due in 2001 bears interest at the prime rate plus one
     percent (9.50 percent at March 31, 1998) and is payable in monthly 
     installments of $100,000 plus accrued interest through April, 2001. The 
     loan contains covenants relating to cashflow coverage, minimum cash 
     balances and requires a compensating balance of $3.0 million.  The loan is
     secured by the tangible assets of the Company.


5.   COMMITMENTS AND CONTINGENCIES

     LEASES

     The Company conducts certain of its operations in leased premises and also
     leases equipment through lease financing.  Terms of the leases, including
     renewal options, vary by lease.  Future minimum rental commitments for all
     noncancelable operating leases that have initial or remaining lease terms 
     in excess of one year are as follows (in thousands):                

<TABLE>
<CAPTION>
          FISCAL YEAR ENDED MARCH 31,                      AMOUNT
          <S>                                              <C>
          1999                                           $    730
          2000                                                673
          2001                                                378
          2002                                                234
          2003                                                  2
                                                         --------
          Total minimum lease payments                   $  2,017
                                                         --------
                                                         --------
</TABLE>

     In fiscal 1998, the Company entered into a new lease for its corporate
     headquarters.  The lease expires in February 2000.  The Company is 
     obligated to pay real estate taxes, insurance and utilities on its portion
     of the leased property.  Rental expense for the years ended March 31, 1996,
     1997 and 1998 was $350,000, $194,000 and $245,000, respectively. 

     In June 1997, the Company entered into an equipment leasing agreement with
     Mellon US Leasing ("Mellon") for a lease line of $1.6 million with a term
     of 48 months.  The outstanding balance on this line of credit at March 31,
     1998 was $1.3 million.

     LICENSE AGREEMENTS

     The Company has entered into license agreements requiring future royalty
     payments ranging from 1 1/4%  to 3% of specified product sales relating to
     the licensed technologies.  Additionally, there is a minimum royalty 
     payment of $600,000 due to one licensor in each calendar year.

     In April 1998, the Company and Chugai Pharmaceutical Co., Ltd. 
     ("Chugai") entered into a strategic alliance to develop and 
     commercialize OPTISON (which may be marketed under a different name) and 
     ORALEX-Registered Trademark- in Japan, Taiwan and South Korea. In 
     exchange for granting to Chugai a royalty-based license to market these 
     products in the named countries, MBI received an upfront license fee 
     from Chugai of $14 million.  In addition, Chugai made an equity 
     investment in MBI common stock.  MBI is eligible to receive milestone 
     payments of up to $20 million based on the achievement of certain 
     product development goals and will receive royalties from Chugai from 
     the sale of commercialized products in the territory.

     PATENT MATTERS

     The Company considers the protection of its proprietary technologies to be
     material to its business prospects. The Company pursues a comprehensive
     program of patent and trademark prosecution for its products both in the 
     United States and in other countries where the Company believes that 
     significant market opportunities exist.

                                       40

<PAGE>

     The Company has an exclusive license to certain United States and foreign
     patents relating to gas-filled sonicated albumin microspheres from Steven 
     B. Feinstein, M.D. (see - Business - Marketing and Licensing Agreements - 
     Feinstein License)  The Company itself owns additional United States and 
     foreign patents covering ALBUNEX that broaden the product coverage of its
     license. Certain of these additional patents cover the Company's continuous
     flow sonication manufacturing process. The European equivalents of these
     manufacturing patents were challenged in an opposition proceeding brought 
     by Andaris Ltd. which was decided in the Company's favor in January 1996.
     Andaris has appealed the decision.  Andaris has also filed an opposition
     against the Company's ALBUNEX composition patent in Europe, and Andaris 
     and two other parties have filed a similar opposition in Japan.  No hearing
     date has been set in these latter two oppositions.

     The Company has received a patent covering its method of manufacturing
     gas-filled albumin microspheres using a milling process under development.
     The Company believes that this process may be more reliable and efficient 
     than the sonication process that the Company currently uses. The Company 
     has also received patents on other perfluorocarbon-based technology 
     relating to ultrasound contrast agents.

     The Company owns a United States patent covering ORALEX and has several
     foreign applications pending. The Company has also filed patent 
     applications relating to several early-stage development products. The
     Company is uncertain whether these applications will result in issued
     patents or whether the covered products can or will be commercialized.

     The last-to-expire of the Company's key United States patents covering
     ALBUNEX and OPTISON expires in 2008, and subject to the outcome of the
     oppositions previously described, the last-to-expire of the Company's key
     European patents covering ALBUNEX and OPTISON expires in 2009.

     The patent position of medical and pharmaceutical companies is highly
     uncertain and involves complex legal and factual questions.  There can be 
     no assurance that the Company will receive patents for all or any of the 
     claims included in its pending or future patent applications, that any 
     issued patents will provide the Company with competitive advantages or will
     not be challenged by third parties, or that existing or future patents of 
     third parties will not have an adverse effect on the Company's ability to
     commercialize its products. Moreover, there can be no assurance that third
     parties will not independently develop similar products, duplicate one or
     more of the Company's products or design around the Company's patents.

     The Company's commercial success also will depend in part upon the Company
     not infringing patents issued to third parties.  There can be no assurance
     that patents issued to third parties will not require the Company to alter
     its products or manufacturing processes, pay licensing fees, or cease 
     development of its current or future products. 

     Litigation or administrative proceedings may be necessary to enforce the
     Company's patents, to defend the Company against infringement claims or to
     determine the priority, scope and validity of the proprietary rights of 
     third parties.  See Item 3, "Legal Proceedings".  Any such litigation or
     administrative proceedings could result in substantial costs to the
     Company, and an unfavorable outcome could have a material adverse effect on
     the Company's business, financial condition and results of operation.
     Moreover, there can be no assurance that, in the event of an unfavorable
     outcome in any litigation or administrative proceedings involving
     infringement claims against the Company, the Company would be able to
     license any proprietary rights that it requires on acceptable terms or at
     all.  The Company's failure to obtain a license that it requires to
     commercialize one of its products could have a material adverse effect on
     the Company's business, financial condition and results of operations.

     The Company has become aware of several United States patents issued to 
     other companies purportedly covering various attributes of
     perfluorocarbon-containing imaging agents such as OPTISON.  Certain of 
     these companies also are pursuing foreign patent protection.  Some of 
     these companies are developing or may be developing ultrasound contrast 
     imaging agents that would compete with OPTISON.  The patents and patent
     applications of these other companies involve a number of complex legal and
     factual issues that are currently unresolved.  The Company believes that 
     there may be a substantial overlap among many of

                                       41

<PAGE>

     the claims in their patents and is currently involved in various 
     administrative proceedings and litigation in the United States and Europe
     to adjudicate their conflicting rights.

     The Company believes that, for a variety of reasons, its commercialization
     of OPTISON will not infringe any valid patent held by any of these other
     companies.  Depending upon the particular patent claim, these reasons
     include, but are not limited to, (i) differences between OPTISON and the
     subject of the claim, (ii) the invalidity of the claim due to the existence
     of prior art, (iii) the inadequacy of the claim's specifications, (iv) lack
     of enablement, (v) inequitable conduct by patentee, and (vi) various other
     defenses as allowed by law.  The Company intends to challenge the validity
     of any such patent granted to one of the other companies if the patent is
     asserted against the Company, and the Company will enforce its own patents
     if any product of one of the other companies infringes the Company's patent
     claims.

     The Company has obtained registered trademarks for "ALBUNEX" and "ORALEX" 
     in the United States and in selected foreign countries.  Additionally
     Mallinckrodt has filed for the trademark for "OPTISON" in various countries
     throughout the world.  There can be no assurance that the Company's 
     registered or unregistered trademarks and trade names will not infringe on
     the proprietary rights of third parties.

     The Company also relies on unpatented trade secrets, proprietary know-how
     and continuing technological innovation which it seeks to protect by, in
     part, confidentiality agreements with its employees, consultants, 
     investigators and others. There can be no assurance that these agreements 
     will not be breached, that the Company would have an adequate remedy for 
     any breach or that the Company's trade secrets or know-how will not
     otherwise become known or independently discovered by third parties.

     OTHER

     The Company is periodically a defendant in other legal actions incidental
     to its business activities.  While any litigation has an element of 
     uncertainty, the Company believes that the outcome of any of these actions
     or all of them combined will not have a materially adverse effect on its
     financial condition or results of operations.



                                       42

<PAGE>

6.   STOCKHOLDERS' EQUITY

     Mallinckrodt has certain registration rights with respect to the 
     Common Stock issued and issuable to them.

     In April 1998, the Company entered into a Common Stock Purchase 
     Agreement with Chugai.  Under this agreement, the Company sold to Chugai 
     691,883 shares of common stock for $12.00 per share which represented a 
     40% premium over the then-prevailing market price for a total equity 
     investment of $8.3 million. These shares are subject to certain 
     covenants and restrictions, including "standstill" rights of the 
     Company, a market stand-off provision and restrictions on 
     transferability.

     COMMON SHARES RESERVED   

     Common shares were reserved for the following purposes (in thousands):

<TABLE>
<CAPTION>

                                                                 MARCH 31,
                                                          ----------------------
                                                             1997         1998
          <S>                                               <C>          <C>
          Options granted                                   2,685        3,139
          Future grants of options                            994          488
                                                            -----        -----
                                                            3,679        3,627
                                                            -----        -----
                                                            -----        -----
</TABLE>

     STOCK OPTIONS-

     In fiscal 1998, the Board of Directors and the shareholders of the 
     Company approved the 1997 Directors' Option Plan and authorized the 
     issuance of options for 300,000 shares pursuant to the plan.  The Plan 
     provides for the grant of both qualified incentive stock options and 
     nonstatutory stock options to purchase Common Stock to non-employee 
     directors of the Company at no less than the fair value of the stock on 
     the date of grant.  Options granted under these plans are exercisable 
     per the terms specified in each individual option, but not before one 
     year (unless the option exercisability is accelerated by the Company's 
     Board of Directors), or later than ten years from the date of grant.
     

     1993 PLANS

     In 1993 both the Board of Directors and the shareholders of the Company 
     approved the 1993 Stock Option Plan and the 1993 Outside Directors Stock 
     Option Plan (together, the 1993 Plans).  The 1993 Plans were intended to 
     replace the Company's 1984 Incentive Stock Option Plan and the 1984 
     Nonstatutory Stock Option Plan (together, the 1984 Plan), under which 
     all of the options authorized to be granted have been granted.  The 1993 
     Plans provide for the grant of both qualified incentive stock options 
     and nonstatutory stock options to purchase Common Stock to employees 
     (1993 Stock Option Plan) or non-employee directors of the Company (1993 
     Outside Directors Stock Option Plan) at no less than the fair value of 
     the stock on the date of grant.  Options granted under these plans are 
     exercisable per the terms specified in each individual option, but not 
     before one year (unless the option exercisability is accelerated by the 
     Company's Board of Directors), or later than ten years from the date of 
     grant. 

     During fiscal 1997, the shareholders approved the Company's Board of 
     Directors recommendation to amend the Company's 1993 Stock Option Plan 
     to increase the maximum number of shares from 2,500,000 shares to 
     3,250,000 shares.

     1984 PLAN

     The Company had an Incentive Stock Option Plan and Nonstatutory Stock 
     Option Plan (together, the 1984 Plan) which provided for the grant of 
     options to purchase Common Stock to employees or non-employee directors 
     of the Company at no less than the fair value of the stock on the date 
     of grant.  Options granted under the 1984 Plan were exercisable per the 
     terms specified in each individual option, but not before one year 
     (unless the option exercisability was accelerated by the Company's Board 
     of Directors) or later than five years from the date of grant.  The 1984 
     Plan expired in July 1994 and there are no shares reserved for future 
     grants.


                                       43
<PAGE>


     On May 11, 1995, the Board of Directors voted to offer the Company's 
     non-executive employees the opportunity to reprice certain stock options 
     which were originally granted under the 1984 Plan to the closing price 
     on May 31, 1995. The Board approved this repricing because it believed 
     retaining key employees was in the best interests of the stockholders 
     and the Company. During the fourth quarter of fiscal 1995, following a 
     decline in the stock price and a restructuring which included a 
     twenty-five percent staff reduction, key employees were being contacted 
     by other companies and agencies about employment opportunities 
     elsewhere. The Board believed the repricing of the options was the most 
     effective employment retention tool available.

     OTHER OPTION GRANTS-

     The Company has granted to employees, consultants and scientific 
     advisors options to purchase shares of common stock.  These options are 
     exercisable per the terms specified in each individual option and lapse 
     pursuant to the terms in the applicable plan.  The options were granted 
     at amounts per share which were not less than the fair market value at 
     the date of grant. 

     Additional information with respect to the Company's option plans is as 
     follows:

<TABLE>
<CAPTION>

                                            EMPLOYEE'S OPTION PLANS                         DIRECTORS' OPTION PLANS
                                          ------------------------------------         -------------------------------------
                                                              OPTION PRICE                                  OPTION PRICE
                                             SHARES            PER SHARE                SHARES                PER SHARE
                                           ----------     --------------------         --------        ----------------------
     <S>                                   <C>            <C>         <C>              <C>             <C>           <C>
     Options Outstanding at Mar 31, 1995   2,072,479      $  7.00  -  $  31.13           40,000        $  8.13  -    $  17.00
     Granted                                 723,602         6.00  -      8.63           20,000           8.63
     Exercised                                (5,450)        6.38  -      7.38                -
     Expired or lapsed                      (622,676)        6.38  -     28.75                -
                                           ---------      -------     --------          -------        -------       --------
     Options Outstanding at Mar 31, 1996   2,167,955         6.00  -     31.13           60,000           8.13  -       17.00
     Granted                                 914,375         6.50  -     11.13           15,000           6.88
     Exercised                              (295,500)        6.00  -     10.63                -
     Expired or lapsed                      (176,760)        6.00  -     31.13                -
                                           ---------      -------     --------          -------        -------       --------
     Options Outstanding at Mar 31, 1997   2,610,070         6.00  -     22.25           75,000           6.88  -       17.00
                                           ---------      -------     --------          -------        -------       --------
     Granted                                 724,100         6.63        10.38           78,000           9.13           9.25
     Exercised                              (100,340)        6.00         8.63                -
     Expired or lapsed                      (248,250)        6.25        22.25                -
                                           ---------      -------     --------          -------        -------       --------
     Options Outstanding at Mar 31, 1998   2,985,580         6.00  -     22.25          153,000           6.88          17.00
                                           ---------      -------     --------          -------        -------       --------
     Options exercisable at Mar 31, 1998   1,542,605                                    114,000
                                           ---------                                    -------
     Reserved for future grants at 
       Mar 31, 1998                          266,280                                    222,000
                                           ---------                                    -------
</TABLE>


     The following table summarizes information about fixed stock options
     outstanding at March 31, 1998:

<TABLE>
<CAPTION>

                                  OPTIONS OUTSTANDING                    OPTIONS EXERCISABLE
                         -----------------------------------------   ---------------------------
                                         Weighted-Avg    Weighted-                     Weighted-
                           Number         Remaining       Average      Number           Average
        Range of         Outstanding     Contractual     Exercise    Exercisable       Exercise
    Exercise Prices      at 3/31/98      Life (years)      Price     at 3/31/98          Price
    ---------------      -----------     ------------   ---------    -----------      -----------
     <S>                 <C>              <C>           <C>          <C>              <C>
     6.00 - 7.4375        1,259,067           8.34         7.0954      481,192           6.8427
     7.50 - 10.625        1,000,863           8.24         8.3310      524,963           8.1261
     10.75 - 22.25          878,650           6.85        14.7428      650,450          16.0119
                          ---------        --------      --------    ---------          -------
     6.00 - 22.25         3,138,580           7.88         9.6342    1,656,605          10.8496

</TABLE>

     As permitted, the Company has adopted the disclosure only provisions of 
     SFAS 123 effective April 1, 1996.  Accordingly, no compensation expense 
     has been recognized for the stock option plans.  Had compensation cost 
     for the Company's 1998 grants for stock-based compensation plans been 
     determined consistent with SFAS 123, the Company's net loss, net loss 
     applicable to common share owners, and net 


                                       44
<PAGE>

     loss per common share for March 31, 1996, 1997 and 1998 would approximate
     the pro forma amounts below (in thousands, except per share amounts).

<TABLE>
<CAPTION>
                                                 Fiscal  Years Ended, March 31,
                                             -------------------------------------
                                                 1996         1997          1998
     <S>                                     <C>            <C>          <C>
     Net income (loss) - as reported         $(20,173)      $(13,284)    $(21,260)
     Net income (loss) - pro forma           $(21,274)      $(14,559)    $(23,877)
     Earning per share (loss) - as reported    $(1.62)        $(0.78)      $(1.19)
     Earning per share (loss) - pro forma      $(1.67)        $(0.86)      $(1.34)
        
</TABLE>

     Because the SFAS 123 method of accounting has not been applied to 
     options granted prior to April 1, 1995, the resulting pro forma 
     compensation cost may not be representative of that to be expected in 
     future years.  The fair value of each option grant was estimated on the 
     date of grant using the Black Scholes option-pricing model with the 
     following weighted average assumptions used for grants in fiscal year 
     1998: risk free rate of 5.39%, expected option life of 4 years, expected 
     volatility of 58% and a dividend rate of zero.   The weighted average 
     fair value of options granted from the Employee stock option plans 
     during fiscal 1996, 1997 and 1998 was $6.93, $9.29 and $7.85, 
     respectively.  The weighted average fair value of options granted from 
     the Outside Director stock option plan during fiscal 1996, 1997 and 1998 
     was $8.63, $6.88 and $9.19, respectively. 
          

      NOTES RECEIVABLE FROM SALE OF COMMON STOCK-

      During fiscal year 1997, the Company repurchased 21,500 shares of 
     Common Stock and forgave notes receivable from related parties of 
     approximately $390,000 relating to the exercise of options to purchase 
     common stock of the Company by officers and other employees. Of this 
     amount, approximately $109,000 was included in accounts and notes 
     receivable and represents taxes payable by the individuals at the time 
     of these option exercises plus accrued interest thereon, as well as 
     accrued interest on purchase price notes.  The amounts relating to the 
     purchase price of the common stock are recorded as a reduction to 
     stockholders' equity.

     During fiscal year 1996, the Company repurchased 15,000 shares of Common 
     Stock in a similar transaction whereby the Company forgave notes 
     receivable of $244,000.  Of this amount, approximately  $56,000 was 
     included in accounts receivable that related to taxes payable by the 
     individuals at the time of the option exercise date, accrued interest 
     thereon, and accrued interest on the notes receivable.
     

7.    SIGNIFICANT RESEARCH CONTRACTS

     The Company conducts all of its research and development activities on 
     its own behalf.  Under the terms of its collaborative research 
     agreements, the Company retains all ownership rights to its proprietary 
     technologies, subject to licensing arrangements made with its licensees.

     In December 1987, December 1988 and March 1989, the Company entered into 
     respective agreements (the Original Agreements) with Nycomed A.S. 
     (Nycomed), a Norwegian corporation, Mallinckrodt, Inc. (Mallinckrodt), 
     of St. Louis, Missouri and Shionogi & Co., Ltd. (Shionogi), a Japanese 
     corporation, under which the Company granted exclusive licenses, 
     restricted to certain geographic areas, to test, evaluate, develop and 
     sell products covered by specified patents of the Company relating 
     directly to the design, manufacture or use of microspheres for 
     ultrasound imaging in vascular applications. The Company also granted 
     rights to sublicense, use, make and sell the licensed products under 
     specified royalty arrangements.

     Under the terms of the Original Agreements, as amended, the Company 
     earned and received license fees of $6.5 million.  The Original 
     Agreements also provide for total payments to the Company aggregating up 
     to $66.5 million, to continue product development, clinical trials, 
     preproduction and premarketing activities relating to the Company's 
     ultrasound imaging contrast agents for vascular applications. These


                                       45
<PAGE>

     amounts are to be received in installments based on the 
     achievement of certain milestones by the Company. 

     In September 1995, the Company entered into an Amended and Restated 
     Distribution Agreement ("ARDA"), as well as a related investment 
     agreement, with Mallinckrodt. Under ARDA, the geographical scope of 
     Mallinckrodt's exclusive right was expanded to include all of the 
     countries of the world other than those covered by the Company's license 
     agreements with Shionogi and Nycomed. Additionally, the duration of 
     Mallinckrodt's exclusive right was also extended from October 1999 until 
     the later of July 1, 2003 or three years after the date that the Company 
     obtains approval from the United States Food and Drug Administration 
     ("FDA") to market OPTISON for an intravenous myocardial perfusion 
     indication.

     The agreement provides the Company with between $33.0 million and $42.5 
     million in financing (including the $13.0 million common stock 
     investment discussed below).  Under the terms of the agreement, 
     Mallinckrodt must make guaranteed payments to the Company totaling $20.0 
     million over four years to support clinical trials, related regulatory 
     submissions and associated product development of the licensed products, 
     which include but are not limited to ALBUNEX and OPTISON.  These 
     payments will be made in 16 quarterly installments of $1.0 million for 
     the first four quarters, $1.25 million for the following eight quarters 
     and $1.5 million for the final four quarters.  The payments may be 
     accelerated in the event that the Company's cumulative outlays for 
     clinical trials are in excess of the amounts received at any point in 
     time.  However, the quarterly payments may not be postponed.  As of 
     March 31, 1998 the first ten quarterly payments had been received by the 
     Company.

     ARDA requires the Company to spend at least $10.0 million of the $20.0 
     million it receives over four years on clinical trials to support 
     regulatory filings with the FDA for cardiac indications of the licensed 
     products.  The Company's expenditure of this $10.0 million will be made 
     in accordance with the directions of a joint steering committee which 
     the Company and Mallinckrodt established in order to expedite the 
     development and regulatory approval of OPTISON by enabling the parties 
     to share their expertise relating to clinical trials and the regulatory 
     approval process.  The Company and Mallinckrodt have each appointed 
     three of the six members of the joint steering committee.

     In connection with ARDA, the Company also entered into an investment 
     agreement whereby the Company sold 1,118,761 unregistered shares of its 
     common stock to Mallinckrodt for $13.0 million, or a price of $11.62 per 
     share before related costs.  Combined with the 181,818 shares of the 
     Company's common stock that Mallinckrodt acquired in December 1988, 
     Mallinckrodt currently owns approximately 7.3% of the Company's issued 
     and outstanding shares.

     In addition, ARDA grants the Company the option (at its own discretion) 
     to repurchase all of the shares of the Company's common stock that 
     Mallinckrodt purchased under the investment agreement for $45.0 million, 
     subject to various price adjustments.  This option is exercisable 
     beginning the later of July 1, 2000 or the date that the Company obtains 
     approval from the FDA to market OPTISON for an intravenous myocardial 
     perfusion indication and ending on the later of June 30, 2003 or three 
     years after the date that the Company obtains approval from the FDA to 
     market OPTISON for an intravenous myocardial perfusion. If the Company 
     exercises this option, the Company may co-market ALBUNEX, OPTISON and 
     related products in all of the countries covered by the amended 
     distribution agreement.

     In December 1996, the Company and Mallinckrodt amended ARDA to expand 
     the geographical scope of Mallinckrodt's exclusive marketing and 
     distribution rights for ALBUNEX, OPTISON and related products. The 
     amendment extended Mallinckrodt's exclusive territory to include the 
     territory that the Company had formerly licensed to Nycomed consisting 
     of Europe, Africa, India and parts of Asia. Under the amendment to ARDA, 
     Mallinckrodt agreed to pay fees up to $12.9 million plus 40 percent of 
     product sales to cover royalties and manufacturing. Mallinckrodt made an 
     initial payment of $7.1 million, consisting of reimbursement to the 
     Company of $2.7 million that the Company paid to Nycomed to reacquire 
     the exclusive product rights in Nycomed's territory, payment of $3 
     million to the Company under the terms of ARDA upon the extension of 
     Mallinckrodt's exclusive rights to Nycomed's former territory, and 
     payment of $1.4 million to Nycomed in satisfaction of the Company's 
     obligation to pay 45 percent of any amounts that the Company receives in 
     excess of $2.7 million upon the licensing of the former Nycomed 
     territory to a third party.  Of the remaining $5.8 million that may be 
     paid, Mallinckrodt will pay $4 million to the Company (upon the 
     achievement of the specified product development milestone) and $1.8 
     million to Nycomed (representing 45% of the $4 million payment to the 
     Company). 


                                       46
<PAGE>

     There can be no assurance, however, that this milestone will be 
     satisfied.  The Company has included all costs related to the 
     reacquisition of its license rights from Nycomed in other nonrecurring 
     charges in the financial statements.  Of these costs, approximately $1 
     million was paid in fiscal 1996 and the remainder was paid in fiscal 
     1997.

     Mallinckrodt is the Company's principal strategic marketing partner for 
     its ALBUNEX and OPTISON ultrasound contrast agents.  Under the Company's 
     arrangements with Mallinckrodt, Mallinckrodt has substantial control 
     over all aspects of marketing the Company's product in its territories.

     In October 1995, the Company entered into an agreement whereby it 
     reacquired all rights to INFOSON (the European designation for ALBUNEX), 
     OPTISON and related products from Nycomed, the Company's European 
     licensee.  The Company agreed to pay Nycomed $2.7 million and 45% of any 
     amounts in excess of $2.7 million that the Company receives in payment 
     for the transfer of marketing rights in the former Nycomed territory to 
     a third party.  The Company also agreed to pay Nycomed a royalty based 
     on future sales, as defined in the agreement.  As stated above, the 
     license rights were resold to Mallinckrodt for amounts stipulated in the 
     amendment to ARDA.

     In September 1996, the Company entered into an agreement with Shionogi 
     pursuant to which the Company reacquired all rights to manufacture, 
     market and sell its ALBUNEX family of products in the territory 
     consisting of Japan, Taiwan and South Korea, formerly exclusively 
     licensed to Shionogi.  This agreement settled an outstanding dispute 
     between the two companies concerning the license and distribution 
     agreement for ALBUNEX and resulted in the dismissal of all claims raised 
     by the companies against each other.  Under the agreement the Company 
     paid $3 million to Shionogi and will pay an additional $5.5 million over 
     the next three years.

     In April 1998, the Company and Chugai entered into a strategic alliance 
     to develop and commercialize OPTISON (which may be marketed under a 
     different name) and ORALEX in Japan, Taiwan and South Korea.  In 
     exchange for granting to Chugai a royalty-based license to market these 
     products in the named countries, MBI received an upfront license fee 
     from Chugai of $14 million.  In addition, Chugai made an equity 
     investment in the Company's common stock. The Company is eligible to 
     receive milestone payments of up to $20 million based on the achievement 
     of certain product development goals and will receive royalties from 
     Chugai from the sale of commercialized products in the territory.

     During the years ended March 31, 1996, 1997 and 1998, the Company 
     received contract research payments and earned revenue under the above 
     agreements as follows (in thousands):

     <TABLE>
     <CAPTION>

                                                FISCAL YEARS ENDED MARCH 31,
                                           -------------------------------------
                                             1996         1997        1998
     <S>                                  <C>            <C>          <C>
     Contract payments received:
          Chugai                          $     -       $       -     $  1,575
          US Government                         -               -           95
          Mallinckrodt                       6,257         10,200        5,000
                                          --------       --------     --------
          Total                           $  6,257       $ 10,200     $  6,670
                                          --------       --------     --------
                                          --------       --------     --------
     Contract payments earned:
          Chugai                          $      -       $      -     $      -
          US Government                          -              -           95
          Mallinckrodt                       2,412         10,200        5,000
                                          --------       --------     --------
          Total                           $  2,412      $  10,200     $  5,095
                                          --------       --------     --------
                                          --------       --------     --------

</TABLE>

8.  OTHER NONRECURRING CHARGES

    Other nonrecurring charges include the following for the years
    presented:

<TABLE>
<CAPTION>

                                                FISCAL YEARS ENDED MARCH 31,
                                             ----------------------------------
                                              1996           1997         1998
<S>                                          <C>           <C>           <C>


                                        47

<PAGE>

     Write-off of license rights of former 
     Nycomed territory (Note 7)                $    -       $3,000         $  -
     Write-off of license fees related to 
     discontinued products                      1,025            -            -
     Legal settlements and related costs 
     (Note 5)                                   1,418            -            -
     Loss on sale of real estate                  667            -            -
                                              -------       ------         -----
                                              $ 3,110       $3,000         $  -
                                              -------       ------         -----
                                              -------       ------         -----
</TABLE>

     In September 1996, the Company entered into an agreement with Nycomed for 
     the repurchase of the rights to manufacture, market and sell its ALBUNEX 
     family of products in the territory formerly exclusively licensed to 
     Nycomed (see note 7).  As a result, during fiscal year 1997 the Company 
     wrote off the license rights of the former Nycomed territory in the 
     amount of $3 million.

     The Company recorded one-time charges in fiscal year 1996 related to the 
     conclusion of arbitration with Bracco S.p.A., the write off of license 
     fees associated with discontinued products and a write down to the sale 
     price of two buildings that were subsequently sold in March 1996.

9.   SUMMARY OF UNAUDITED QUARTERLY FINANCIAL INFORMATION

     The following is a summary of the unaudited quarterly results of operations
     for the years ended March 31, 1998 and 1997 (in thousands, except per share
     amounts):
     
<TABLE>
<CAPTION>

     QUARTER ENDED:                         JUN 30         SEP 30       DEC 31           MAR 31
     --------------                       ---------      --------    ----------        ---------
     <S>                                  <C>            <C>          <C>              <C>
     Fiscal 1998
     Revenues                             $  1,474       $  1,426     $  1,373         $  1,973
     Research and Development Costs          2,185          2,680        2,939            3,274
     Total Operating Costs and Expenses      6,736          6,401        7,517            8,127
     Net Loss                               (4,799)        (4,621)      (5,903)          (5,937)
     Loss Per Common Share                   (0.27)         (0.26)       (0.33)           (0.33)
     Weighted Average Common Shares 
        Outstanding                         17,752         17,768       17,813           17,838
     
     QUARTER ENDED:                         JUN 30         SEP 30       DEC 31           MAR 31
                                           -------         ------       ------          -------
     Fiscal 1997
     Revenues                             $  1,178       $  1,216     $  7,007         $  1,450
     Research and Development Costs          2,636          2,328        2,354            2,584
     Total Operating Costs and Expenses      5,691          5,465        8,298            6,248
     Net Loss                               (4,384)        (3,693)        (879)          (4,328)
     Loss Per Common Share                    (.30)          (.21)        (.05)            (.24)
     Weighted Average Common Shares 
        Outstanding                         14,787         17,560       17,572           17,711

</TABLE>

10.  SUBSEQUENT EVENTS

     In April 1998, the Company and Chugai entered into a strategic alliance 
     to develop and commercialize OPTISON (which may be marketed under a 
     different name) and ORALEX in Japan, Taiwan and South Korea.  In 
     exchange for granting to Chugai a royalty-based license to market these 
     products in the named countries, MBI received an upfront license fee 
     from Chugai of $14 million. Additionally, Chugai purchased 691,883 
     shares of the Company's common stock at a premium of 40% over the 
     then-prevailing market price.  The equity investment was valued at $8.3 
     million.  The Company is eligible to receive milestone payments of up to 
     $20 million based on the achievement of certain product development 
     goals and will receive royalties from Chugai from the sale of 
     commercialized products in the territory.

                                       48

<PAGE>

      
     On May 18, 1998, OPTISON, the Company's second-generation contrast agent 
     for cardiac ultrasound imaging, received final marketing authorization 
     by the European Agency for the Evaluation of Medicinal Products for use 
     in patients with suspected or known cardiovascular disease.  The 
     authorization covers all 15 member states of the European Union.


                                       49
<PAGE>

                                      PART III

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     Information concerning directors is incorporated in this report by
reference to the information contained under the caption "Election of Directors"
in the Company's definitive proxy statement for the 1998 Annual Meeting of
Stockholders to be held on August 13, 1998 ("1998 Proxy Statement"). 
Information concerning executive officers is included in Part I of this report. 


ITEM 11.  EXECUTIVE COMPENSATION

     Information concerning executive compensation is incorporated in this
report by reference to the information contained under the caption "Executive
Compensation" in the Company's 1998 Proxy Statement.


ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     Information concerning security ownership is incorporated in this report by
reference to the information contained under the caption "Stock Ownership" in
the Company's 1998 Proxy Statement.


ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     Information concerning certain relationships and related transactions is
incorporated in this report by reference to the information contained under the
caption "Certain Relationships and Related Transactions" in the Company's 1998
Proxy Statement.

                                      50

<PAGE>

                                     PART IV

ITEM 14.    EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(a) (1)     FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULES

    (2)     The financial statements and financial statement schedules
            filed as a part of this Report are listed in the "Index to
            Consolidated Financial Statements and Schedules" on page 29.
          
    (3)     Exhibits -Exhibits marked with an asterisk are filed with
            this Report;  all other Exhibits are incorporated by
            reference.  Exhibits marked with a dagger are management
            contracts or compensatory plans or arrangements.              

     3.1    Certificate of Incorporation of the Company, as amended to
            date (by amendments filed March 4, 1981, March 30, 1982,
            March 14, 1983, April 18, 1983, and November 20, 1987). 
            (Incorporated by reference from Exhibit 3.1 to the Company's
            Annual Report on Form 10-K for the fiscal year ended March
            31, 1988.)
     
     3.2*   Certificate of Amendment to Certificate of Incorporation of
            Molecular Biosystems, Inc. dated August 20, 1996.
     
     3.3    Certificate of Incorporation of Syngene, Inc. as amended
            September 20, and December 31, 1989.  (Incorporated by
            reference from Exhibit 3.2 to the Company's Annual Report of
            Form 10-K for the fiscal year ended March 31, 1990.)
                    
     3.4    By-Laws of the Company, as amended and restated September
            18, 1990.  (Incorporated by reference from Exhibit 3.3 to
            the Company's Annual Report on Form 10-K for the fiscal year
            ended March 31, 1991).
     
     3.5    First Amendment, dated August 20, 1992 to the By-Laws of the
            Company, as amended and restated September 18, 1990.  
            (Incorporated by reference from Exhibit 3.4 to the Company's
            Annual Report on Form 10-K for the fiscal year ended March
            31, 1994.)

     3.6    By-Laws of Syngene, Inc. (Incorporated by reference from
            Exhibit 3.4 to the Company's Annual Report on form 10-K for
            the fiscal year ended March 31, 1990.)
     
    10.1    Restated License Agreement dated June 1, 1989 between the
            Company and Steven B. Feinstein, M.D., and related Research
            and Supply Agreement dated June 1, 1989.  (Incorporated by
            reference from Exhibits 10.1 and 10.2 to the Company's
            Current Report on Form 8-K filed on June 9, 1989.)

    10.2    Amendment to Research Support and Supply Agreement dated
            December 15, 1992 between the Company and Steven B.
            Feinstein, M.D. (Incorporated by reference from Exhibit 10.2
            to the Company's Annual Report on Form 10-K for the fiscal
            year ended March 31, 1993.)
          
    10.3    License and Cooperative Development Agreement dated December
            31, 1987 between the Company and Nycomed AS ("Nycomed"), and
            related Investment Agreement dated December 31, 1987,
            Registration Agreement dated December

                                      51

<PAGE>

            31, 1987 and Common Stock Purchase Warrant dated January 19, 1988.
            (Incorporated by reference from Exhibit 10.8 to the
            Company's Annual Report on Form 10-K for the fiscal year
            ended March 31, 1988.)
          
    10.4    Amendment to License and Cooperative Development Agreement
            dated June 15, 1989 between the Company and Nycomed. 
            (Incorporated by reference from Exhibit 10.8 to the
            Company's Annual Report on Form 10-K for the fiscal year
            ended March 31, 1989.)
               
    10.5    Amendment No. 3 to License and Cooperative Development Agreement
            dated October 24, 1995 between the Company and Nycomed
            Imaging AS. (Incorporated by reference from Exhibit 10.3 to
            the Company's Quarterly Report on Form 10-Q/A for the
            quarterly period ended December 31, 1995.)
     
    10.6    Amended and Restated Distribution Agreement dated September 7,
            1995 between the Company and Mallinckrodt Medical, Inc.
            (Incorporated by reference from Exhibit 10.1 to the
            Company's Quarterly Report on Form 10-Q for the quarterly
            period ended December 31, 1995.)
     
    10.7    Amendment to Amended and Restated Distribution Agreement
            dated November 4, 1996 between the Company and Mallinckrodt
            Medical, Inc. (Incorporated by reference from Exhibit 10.7
            to the Company's Annual Report on Form 10-K for the fiscal
            year ended March 31, 1997.)
     
    10.8    Investment Agreement dated December 7, 1988 between the
            Company and Mallinckrodt Medical, Inc.(Incorporated by
            reference from Exhibit 10.9 to the Company's Annual Report
            on form 10-K for the fiscal year ended March 31, 1989.)
     
    10.9    Investment Agreement dated September 7, 1995 between
            the Company and Mallinckrodt Medical, Inc. (Incorporated by
            reference from Exhibit 10.2 to the Company's Quarterly
            Report on Form 10-Q/A for the quarterly period ended
            December 31, 1995.)
     
    10.10   Cooperative Development and Marketing Agreement
            effective March 31, 1998 between the Company and Chugai
            Pharmaceutical Co., Ltd. (Incorporated by reference from
            Exhibit 2.1 to the Company's Current Report on Form 8-K
            dated April 7, 1998)
     
    10.11   Common Stock Purchase Agreement effective March 31,
            1998 between the Company and Chugai Pharmaceutical Co., Ltd.
            (Incorporated by reference from Exhibit 2.2 to the Company's
            Current Report on Form 8-K dated April 7, 1998)
     
    10.12   Letter Agreement dated February 18, 1991 between the
            Company and Schering Aktiengesellschaft.  (Incorporated by
            reference from Exhibit 10.9 to the Company's Annual Report
            of Form 10-K for the fiscal year ended March 31, 1991.)
          
    10.13   Settlement Agreement and Mutual Release dated September 10, 1996
            between the Company and Shionogi & Co., Ltd. (Incorporated by
            reference from Exhibit 10.11 to the Company's Annual Report
            of Form 10-K for the fiscal year ended March 31, 1997.)
     
    10.14   Exclusive License Agreement dated April 1, 1992 between
            the Company and The Regents of the University of California. 
            (Incorporated by reference from Exhibit

                                      52

<PAGE>

            10.30 to the Company's Annual Report on Form 10-K for the fiscal
            year ended March 31, 1992.)
     
    10.15   License Agreement dated August 23, 1991 between the Johns Hopkins
            University, Towson State University and the Company.  (Incorporated 
            by reference from Exhibit 10.31 to the Company's Annual Report on
            Form 10-K for the fiscal year ended March 31, 1992.)
     
    10.16   License Agreement dated November 11, 1991 between the Company and 
            the Regents of the University of Michigan. (Incorporated by
            reference from Exhibit 10.32 to the Company's Annual Report on Form 
            10-K for the fiscal year ended March 31, 1992.)
     
    10.17   Exclusive License Agreement dated July 31, 1990 between the Company
            and the Regents of the University of California, and Amendment 
            Agreement dated April 1, 1992.  (Incorporated  by reference from
            Exhibit 10.33 to the Company's Annual Report on Form 10-K for the 
            fiscal year ended March 31, 1992.) 

    10.18   License Option Agreement dated January 29, 1993 between the Company 
            and Abbott Laboratories. (Incorporated by reference from Exhibit
            10.1 to the Company's Current Report on Form 8-K dated January 29,
            1993.)
               
    10.19+  Molecular Biosystems, Inc. Pre-1984 Nonstatutory Stock Option Plan. 
            (Incorporated by reference from Exhibit 10.11 to the Company's 
            Annual Report on Form 10-K for the fiscal year ended March 31, 
            1989.)
     
    10.20+  Molecular Biosystems, Inc. 1984 Incentive Stock Option Plan and 1984
            Nonstatutory Stock Option Plan, as amended by First and Second
            Amendments. (Incorporated by reference from Exhibit 10.15 to the 
            Company's Annual Report on Form 10-K for the fiscal year ended 
            March 31, 1988.)
     
    10.21+  Third and Fourth Amendments to Molecular Biosystems, Inc. 1984 
            Incentive Stock Option Plan and 1984 Nonstatutory Stock Option Plan.
            (Incorporated by reference from Exhibit 10.13 to the Company's 
            Annual Report on Form 10-K for the fiscal year ended March 31, 
            1989.)
          
    10.22+  Fifth Amendment to Molecular Biosystems, Inc. 1984 Incentive Stock 
            Option Plan and 1984 Nonstatutory Stock Option Plan. (Incorporated 
            by reference from Exhibit 10.15 to the Company's Annual Report on 
            Form 10-K for the fiscal year ended March 31, 1990.)
                    
    10.23+  Sixth and Seventh Amendments to Molecular Biosystems, Inc. 1984 
            Incentive Stock Option Plan and 1984 Nonstatutory Stock Option Plan.
            (Incorporated by reference from Exhibit 10.15 to the Company's 
            Annual Report on Form 10-K for the fiscal year ended March 31, 
            1991.)
     
    10.24+  Eighth and Ninth Amendments to Molecular Biosystems, Inc. 1984
            Incentive Stock Option Plan and 1984 Nonstatutory Stock Option Plan.
            (Incorporated by reference from Exhibit 10.25 to the Company's 
            Annual Report on Form 10-K for the fiscal year ended March 31, 
            1993.)
     
    10.25+  Form of Stock Option Agreement used with the Company's 1984 
            Incentive Stock Option Plan and 1984 Nonstatutory Stock Option Plan.
            (Incorporated by reference from Exhibit 10.16 to the Company's
            Annual Report on Form 10-K for the fiscal year ended March 31, 
            1988.)
     
                                      53

<PAGE>

    10.26+  Molecular Biosystems, Inc. 1993 Stock Option Plan.  (Incorporated by
            reference from Exhibit 4.2 to the Company's Registration Statement 
            No. 33-78572 on Form S-8, dated May 3, 1994, filed on May 5, 1994.)
     
    10.27+  Form of Stock Option Agreement used with the Company's 1993 Stock 
            Option Plan. (Incorporated by reference from Exhibit 10.33 to the 
            Company's Annual Report on Form 10-K for the fiscal year ended 
            March 31, 1994.)
          
    10.28+  Molecular Biosystems, Inc. 1993 Outside Directors Stock Option Plan.
            (Incorporated by reference from Exhibit 4.2 to the Company's 
            Registration Statement No. 33-78564 on Form S-8, dated May 3, 
            1994, filed on May 5, 1994.)
     
    10.29+  Form of Stock Option Agreement used with the Company's 1993 Outside
            Directors Stock Option Plan. (Incorporated by reference from Exhibit
            10.35 to the Company's Annual Report on Form 10-K for the fiscal
            year ended March 31, 1994.)
          
    10.30   First Amendment to the Molecular Biosystems, Inc. 1993 Stock Option
            Plan (Incorporated by reference from Exhibit 4.1 to the Company's 
            Registration Statement on Form S-8 filed on September 15, 1997 
            (Registration No. 333-35633.)  

    10.31   Molecular Biosystems, Inc. 1997 Outside Directors Stock Option Plan
            (Incorporated by reference from Exhibit 4.1 to the Company's 
            Registration Statement on Form S-8 filed on September 15, 1997 
            (Registration No. 333-35631.) 
          
    10.32+* Second Amendment to 1993 Stock Option Plan
     
    10.33+* Third Amendment to 1993 Stock Option Plan
     
    10.34+  Employment Agreement dated April 25, 1995 between the Company and 
            Kenneth J. Widder, M. D. (Incorporated by reference from Exhibit
            10.30 to the Company's Annual Report on Form 10-K for the fiscal 
            year ended March 31, 1995.) 

    10.35+  Employment Agreement dated November 1, 1995 between the Company and
            Bobba Venkatadri. (Incorporated by reference from Exhibit 10.41 to 
            the Company's Annual Report on Form 10-K for the fiscal year ended 
            March 31, 1996.)
     
    10.36+  First Amendment to Employment Agreement dated April 30, 1996 
            between the Company and Bobba Venkatadri. (Incorporated by reference
            from Exhibit 10.34 to the Company's Annual Report of Form 10-K for
            the fiscal year ended March 31, 1997.)

    10.37   Partnership Agreement dated October 18, 1996 between the Company 
            and Bobba and Annapurna Venkatadri.  (Incorporated by reference 
            from Exhibit 10.36 to the Company's Annual Report on Form 10-K for
            the fiscal year ended March 31, 1997).
     
    10.38+* Employment Agreement dated as of September 1, 1997 between the 
            Company and Gerard A. Wills.
     
                                      54

<PAGE>


    10.39+* Employment Agreement dated as of September 1, 1997 between the
            Company and William I. Ramage.
     
    10.40+* Employment Agreement dated as of December 1, 1997 between the 
            Company and Thomas Jurgensen.
     
    10.41+* Employment Agreement dated as of September 1, 1997 between the
            Company and Joni Harvey. 
     
    10.42+* Employment Agreement dated as of September 1, 1997 between the 
            Company and Howard Dittrich. 
          
    10.43+* Separation Agreement effective May 30, 1997 between the Company 
            and Allan Mizoguchi, Ph.D. 

    10.44+* Separation Agreement effective May 30, 1997 between the Company and
            James Barnhart, Ph.D. 

    10.45   Triple Net Lease dated June 19, 1995 between the Company and 
            Radnor/Collins/Sorrento Partnership. (Incorporated by reference from
            Exhibit 10.43 to the Company's Annual Report on Form 10-K for the 
            fiscal year ended March 31, 1995.)
     
    10.46*  First Amendment to Sublease dated February 27, 1998 between the 
            Company and Dura Pharmaceuticals, Inc.
     
    10.47*  Sublease dated October 1, 1997 between the Company and Dura 
            Pharmaceuticals, Inc. 

    10.48*  Equipment Lease Agreement dated June 30, 1997 between the Company 
            and Mellon US Leasing.
          
    10.49*  Sublease dated February 16, 1998 between the Company and ComStream
            Corporation.
          
    10.50   Promissory note dated December 31, 1993 between the Company and 
            James L. Barnhart. (Incorporated by reference from Exhibit 10.48 to
            the Company's Annual Report on Form 10-K for the fiscal year ended 
            March 31, 1994.)
     
    10.51   Second Amendment to Promissory note dated June 24, 1996 between the
            Company and James L. Barnhart. (Incorporated by reference from 
            Exhibit 10.52 to the Company's Annual Report on Form 10-K for the 
            fiscal year ended March 31, 1996.) 
     
    10.52   Promissory note dated December 31, 1993 between the Company and 
            John W. Young. (Incorporated by reference from Exhibit 10.49 to the
            Company's Annual Report on Form 10-K for the fiscal year ended 
            March 31, 1994.)

    19      Documents not previously filed are marked with an asterisk (*).
     
    23*     Consent of Arthur Andersen LLP.

(b)    REPORTS ON FORM 8-K

                                      55

<PAGE>


     A Current Report on Form 8-K dated May 18, 1998, was filed on May 22,
     1998, reporting final marketing authorization of OPTISON by the
     European Agency for the Evaluation of Medicinal Products.

     A Current Report on Form 8-K dated April 7,1998, was filed on April
     22, 1998, reporting (1) a Cooperative Development and Marketing
     Agreement effective March 31, 1998 between the Company and Chugai
     Pharmaceutical Co., Ltd., and (2) a Common Stock Purchase Agreement
     effective March 31, 1998 between the Company and Chugai Pharmaceutical
     Co., Ltd.

                                      56

<PAGE>

SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this Report to be signed on
its behalf by the undersigned, thereunto duly authorized, on
June 25, 1998.

                              MOLECULAR BIOSYSTEMS, INC.


                                   By: /s/ Kenneth J. Widder, M.D.     
                                       -------------------------------- 
                                           Kenneth J. Widder, M.D.
                                           Chairman of the Board
     
     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Report has been signed below by the following persons on behalf of the
Registrant and in the capacities and on the dates indicated. 

<TABLE>
<CAPTION>
<S>                                     <C>                                <C>

     SIGNATURE                                TITLE                           DATE

/s/ Kenneth J. Widder, M.D.             Chairman of the Board              June 25, 1998
- ------------------------------         
    Kenneth J. Widder, M.D.         

/s/ Bobba Venkatadri                    President, Chief Executive         June 25, 1998
- ------------------------------          Officer
    Bobba Venkatadri                    

/s/ Gerard A. Wills                     Vice President - Finance           June 25, 1998
- ------------------------------          and Chief Financial Officer
    Gerard A. Wills                     (Principal Financial and
                                        Accounting Officer

/s/ Robert W. Brightfelt                Director                           June 25, 1998
- ------------------------------         
    Robert W. Brightfelt

/s/ Charles C. Edwards, M.D.            Director                           June 25, 1998
- ------------------------------         
    Charles C. Edwards, M.D.

/s/ Gordon C. Luce                      Director                           June 25, 1998
- ------------------------------         
    Gordon C. Luce

/s/ David Rubinfien                     Director                           June 25, 1998
- ------------------------------         
    David Rubinfien

/s/ David W. Barry, M.D.                Director                           June 25, 1998
- ------------------------------         
    David W. Barry, M. D.

/s/ Jerry Jackson                       Director                           June 25, 1998
- ------------------------------         
    Jerry Jackson

</TABLE>

                                      57

<PAGE>
                                                                     EXHIBIT 3.2

                            CERTIFICATE OF AMENDMENT TO 
                          CERTIFICATE OF INCORPORATION OF
                             MOLECULAR BIOSYSTEMS, INC.

     Molecular Biosystems, Inc. a corporation duly organized and existing under
the General Corporation Laws of the State of Delaware (the "Corporation"),
hereby certifies that:

     FIRST.  The Board of Directors of the Corporation, by unanimous vote of 
its members at a meeting duly convened pursuant to the General Corporation 
Law of the State of Delaware, at which a quorum of the members of the Board 
of Directors was present in person, duly adopted a resolution proposing and 
declaring advisable an amendment to the Corporation's Certificate of 
Incorporation to amend Article 4(a) of the Corporation's Certificate of 
Incorporation to read as follows:

          "Paragraph 4(a).  The Corporation shall have authority to
          issue a total of 40,000,000 shares of common stock, par
          value $.01 per share."

     SECOND.  This amendment was duly considered and approved by the majority 
of the stockholders entitled to vote and voting at an annual meeting of the 
stockholders held upon notice in accordance with Section 222 of the General 
Corporation Law of the State of Delaware.  

     THIRD.  This amendment was duly adopted in accordance with the 
provisions of Section 242 of the General Corporation Law of the State of 
Delaware.

     IN WITNESS WHEREOF, the undersigned, Molecular Biosystems, Inc., has 
caused this Certificate of Amendment to be signed by Kenneth J. Widder, M.D., 
its Chairman of the Board of Directors and Chief Executive Officer, and 
attested to by Craig P. Colmar, Secretary, on this 20th day of August, 1996.

                              MOLECULAR BIOSYSTEMS, INC.



                              By:  /s/ Kenneth J. Widder, M.D.
                                   ---------------------------------
                                   Kenneth J. Widder, M.D., CHAIRMAN
                                OF THE BOARD AND CHIEF EXECUTIVE OFFICER

ATTEST:

Craig P. Colmar, SECRETARY



<PAGE>

                                                                  EXHIBIT 10.32

                                SECOND AMENDMENT TO

                 MOLECULAR BIOSYSTEMS, INC. 1993 STOCK OPTION PLAN



The Molecular Biosystems, Inc. 1993 Stock Option Plan, as amended (the "Plan"),
is amended as follows pursuant to the authority of the Board of Directors of
Molecular Biosystems, Inc. under Paragraph 8.2 of the Plan:

1.    PARAGRAPH 2.1A.  The following provision is added as Paragraph 2.1a of 
the Plan:

2.1a  CHANGE OF CONTROL means an event or the last of a series of related 
events by which:

(1)   any Person directly or indirectly acquires or otherwise becomes 
entitled to vote 25% or more of the Company's Common Stock (or, if in the 
future the Company has more than one class of stock outstanding, any Person 
directly or indirectly acquires or otherwise becomes entitled to vote stock 
having 25% or more of the voting power in elections for Directors); or

(2)   during any 24-month period a majority of the members of the Board of 
Directors ceases to consist of Directors who were:

(a)   Directors at the beginning of the period ("Continuing Directors"); or

(b)   appointed to office after the start of the period by the Board of 
Directors with the approval of two-thirds of the incumbent Continuing 
Directors ("Appointed Directors"); or

(c)   elected to office after the start of the period by the Company's 
stockholders following nomination for election by the Board of Directors with 
the approval of two-thirds of the incumbent Continuing Directors ("Elected 
Directors"); or

(d)   appointed to office after the start of the period by the Board of 
Directors with the approval of two-thirds of the incumbent Continuing, 
Appointed and Elected Directors; or

(e)   elected to office after the start of the period by the Company's 
stockholders following nomination for election by the Board of Directors with 
the approval of two-thirds of the incumbent Continuing, Appointed and Elected 
Directors; or

(3)   the Company merges or consolidates with another corporation, and 
holders of outstanding shares of the Company's Common Stock immediately prior 
to the merger or consolidation do not own stock in the survivor of the merger 
or consolidation having more than 75% of the voting power in elections for 
directors; or

                                      -1-

<PAGE>


(4)   the Company sells all or a substantial portion of the consolidated 
assets of the Company and its Subsidiaries, and the Company does not own 
stock in the purchaser having more than 75% of the voting power in elections 
for directors.

As used in this Paragraph 2.1a, a "Person" means any "person" as that term is 
used in sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as 
amended, together with all of that person's "affiliates" and "associates" as 
those terms are defined in Rule 12b-2 of the Securities and Exchange 
Commission.

2.    PARAGRAPH 6.2.  Paragraph 6.2 of the Plan is amended to read as follows:

6.2   TERM. The Plan Committee shall determine (i) whether each Option shall 
be exercisable in full at one time or in installments at different times and 
(ii) the time or times at which the Option or Installments shall become and 
remain exercisable. No Option or Installment shall be exercisable prior to 
the first anniversary of the Grant Date (except as its exercisability is 
accelerated by reason of a Change in Control or by action of the Plan 
Committee) or have an Expiration Date later than the tenth anniversary of the 
Grant Date.

Notwithstanding any limitation on exercisability in Paragraph 6.6 or anything 
to the contrary in the underlying Option Agreement, each outstanding Option 
or Installment shall become exercisable in full upon a Change in Control. In 
addition, the Plan Committee, in its discretion, may accelerate the 
exercisability of any Option or Installment at any time under any related or 
other circumstances.

3.    EFFECTIVE DATE.  This Amendment shall become effective as of the date 
of its approval by the Board of Directors of Molecular Biosystems, Inc.

                                      -2-

<PAGE>
                                                                  EXHIBIT 10.33
                                          
                                 THIRD AMENDMENT TO

                 MOLECULAR BIOSYSTEMS, INC. 1993 STOCK OPTION PLAN


The Molecular Biosystems, Inc. 1993 Stock Option Plan, as amended (the "Plan"),
is amended as follows pursuant to the authority of the Board of Directors of
Molecular Biosystems, Inc. under Paragraph 8.2 of the Plan:

1.   PARAGRAPH 2.5.  Paragraph 2.5 of the Plan is amended to read as follows:

2.5  NON-EMPLOYEE DIRECTOR means a Director who (i) is not currently an 
Officer or Employee, (ii) does not receive direct or indirect compensation 
from the Company or any Subsidiary for services rendered as a consultant, or 
in any capacity other than as a Director, in an amount for which disclosure 
would be required under Item 404(a) of Regulation S-K of the Securities and 
Exchange Commission ("Item 404(a)"), (iii) does not possess an interest in 
any other transaction for which disclosure would be required under Item 
404(a) and (iv) is not engaged in a business relationship for which 
disclosure would be required under Item 404(a).

2.   PARAGRAPH 2.14.  Paragraph 2.14 of the Plan is amended to read as follows:

2.14 OFFICER means: (i) the Company's Chief Executive Officer; (ii) the 
Company's Chief Operating Officer; (iii) the Company's President; (iv) any 
Vice President of the Company; and (v) any other person who is considered an 
"officer" of the Company for purposes of Rule 16a-1(f) under the Securities 
Exchange Act of 1934.

3.   PARAGRAPH 5.2.  Paragraph 5.2 of the Plan is amended to read as follows:

5.2  OFFICER OPTIONS COMMITTEE.  The Plan shall be administered by a 
committee (the "Officer Options Committee") in respect of Officers. The 
Officer Options Committee shall be or consist of (i) the Compensation 
Committee of the Board, or (ii) if any member of the Compensation Committee 
is not a Non-Employee Director, the members of the Compensation Committee who 
are Non-Employee Directors, or (iii) if there are not at least two members of 
the Compensation Committee who are Non-Employee Directors, the full Board.

4.   EFFECTIVE DATE.  This Amendment shall become effective as of the date of 
its approval by the Board of Directors of Molecular Biosystems, Inc.


<PAGE>

                                                                  EXHIBIT 10.38

                                 EMPLOYMENT AGREEMENT

     EMPLOYMENT AGREEMENT dated as of September 1, 1997, between GERARD A.
WILLS, an individual ("Employee"), and MOLECULAR BIOSYSTEMS, INC., a Delaware
corporation ("the Company").

     1.   EMPLOYMENT.  The Company hereby employs the Employee as its Vice 
President, Finance and Chief Financial Officer, to provide services at such 
times as shall be mutually agreed upon between them.  The Company shall be 
entitled to all of the benefits and profits arising from or incident to the 
work, services and advice rendered by the Employee relating to the work 
performed for the Company.  The Employee shall make all information available 
to the Company that relates to the Company's business of which he has any 
knowledge and shall not use any such information or the benefits of any such 
information for his personal profit or that of any third party.  The Employee 
agrees to use his best efforts to promote the interests of the Company 
including, where appropriate, the publication of articles in medical and 
scientific journals and the participation in medical and scientific seminars 
and symposiums relating to the business and affairs of the Company and/or his 
research efforts performed for and on behalf of the Company.  The Employee 
shall perform the duties of employment in a manner satisfactory to the 
Company and shall devote his full working time to such duties.

     2.   DISCLOSURES.  I shall promptly disclose in writing to the officials 
designated by the Company to receive such disclosures, complete information 
concerning each and every invention, discovery, improvement, device, design, 
apparatus, practice, process, method or product (hereinafter referred to as 
"Inventions"), whether I consider them patentable or not, made, developed, 
perfected, devised, conceived or reduced to practice by me, either solely or 
in collaboration with others, during the period of my employment by the 
Company, and up to and including a period of twelve (12) months after 
termination of my employment, whether or not during regular working hours, 
relating either directly or indirectly to the business, products, practices 
or techniques of the Company or to the Company's actual or demonstrably 
anticipated research or development, or resulting from any work performed by 
me for the Company or with the equipment, supplies, facilities or 
confidential information of the Company.

     3.   CONFIDENTIALITY.  I recognize that my employment with the Company 
will involve contact with information of substantial value to the Company, 
which is not old and generally known in the trade and which gives the Company 
an advantage over its competitors who do not know or use it, including but 
not limited to techniques, designs, drawings, processes, inventions, 
developments, equipment, prototypes, sales and customer information, and 
business and financial information, relating to the business, products, 
practices or techniques of the Company (hereinafter referred to as 
"Confidential Information").  I shall at all times regard and preserve as 
confidential such Confidential Information obtained by me from whatever 
source and shall not, either during my employment or thereafter, publish or 
disclose any part of such Confidential Information in any

                                       1

<PAGE>


manner, or use the same except on behalf of the Company, without the prior 
written consent of the Company.  Further, I shall, during my employment and 
thereafter, refrain from any acts or omissions that would reduce the value of 
such Confidential Information to the Company.

     4.   ASSIGNMENT OF RIGHTS.  I hereby agree that any Inventions made, 
developed, perfected, devised, conceived or reduced to practice by me during 
the period of my employment by the Company, and any other Inventions made, 
developed, perfected, devised, conceived or reduced to practice by me during 
said period of twelve (12) months after termination of my employment if based 
upon the Confidential Information of the Company, relating either directly or 
indirectly to the business, products, practices or techniques of the Company 
or to the Company's actual or demonstrably anticipated research or 
development, or resulting from any work performed by me for the Company or 
with the equipment, supplies, facilities or Confidential Information of the 
Company, are the sole property of the Company, and hereby assign and agree to 
assign to the Company, its successors and assigns, all of my right, title and 
interest in and to said Inventions, and any patent applications or Letters 
Patent thereon.

                               NOTIFICATION
                               ____________

     This Agreement does  not apply to an invention for which no equipment, 
supplies, facility, or trade secret information of the Company was used and 
which was developed entirely on my own time, and (a) which does not relate 
(1) to the business of the Company or (2) to the Company's actual or 
demonstrably anticipated research or development, or (b) which does not 
result from any work performed by me for the Company, as defined and provided 
by Section 2870 of the California Labor Code.

     5.   COVENANT OF COOPERATION.  I shall, at any time during employment or 
thereafter, upon request and without further compensation therefor, but at no 
expense to me, do all lawful acts, including but not limited to the execution 
of papers and oaths, the giving of testimony, and the obtaining of evidence 
that in the opinion of the Company, its successors or assigns, may be 
necessary or desirable for obtaining, sustaining, reissuing or enforcing 
Letters Patent in the United States and throughout the world for said 
Inventions, and for perfecting, recording or maintaining the title of the 
Company, its successors and assigns, to said Inventions and to any patent 
applications made and any Letters Patent granted for said Inventions in the 
United States and throughout the world.

     6.   PATENT ENFORCEMENT.  The Company shall have the sole discretion 
whether to obtain, maintain, modify or enforce any domestic or foreign patent 
for said Inventions assigned to the Company pursuant to this Agreement.  The 
Company is free to enter into any licensing or assignment agreement with any 
third party or to use whatever means it deems best to develop, promote or 
market said Inventions assigned to the Company pursuant to this Agreement or 
any domestic or foreign patent thereof.

     7.   CLAIMS BY THIRD PARTY.  As to any Inventions which were made, 
developed, perfected, devised, conceived or reduced to practice by me during 
the period of my employment by the

                                       2

<PAGE>


Company, and up to and including a period of twelve (12) months after 
termination of my employment, but which are claimed for any reason to belong 
to an entity or person other than the Company, I will promptly disclose the 
same in writing to the Company and shall not disclose the same to others if 
the Company, within twenty (20) days thereafter, shall claim ownership of 
such Inventions under the terms of this Agreement.  If the Company makes such 
a claim, I agree that any controversy relating to such claim shall be settled 
and determined by binding arbitration conducted in San Diego, California, in 
accordance with the rules of the Judicial Arbitration and Mediation Services 
then existing.  The cost of arbitration shall be shared equally.

     8.   RECORD KEEPING.  I shall keep complete, accurate and authentic 
accounts, notes, data and records of any and all of said Inventions in the 
manner and form requested by the Company.  Such accounts, notes, data and 
records, including all copies thereof, shall be the property of the Company, 
and upon its request, I will promptly surrender the same to it, or if not 
previously surrendered, I will promptly surrender the same to the Company at 
the conclusion of my employment.

     9.   RECORDS PROPERTY OF COMPANY.  I agree that all accounts, notes, 
data sketches, drawings and other documents and records, and all material and 
physical items of any kind, including all reproductions and copies thereof, 
which relate in any way to the business, products, practices or techniques of 
the Company or contain Confidential Information, made by me or that come into 
my possession by reason of my employment are the property of the Company and 
shall be promptly surrendered to the Company at the conclusion of my 
employment.

     10.  INDUCEMENT.  I agree that I shall not disclose to the Company or 
induce the Company to use an invention or confidential information belonging 
to any third party.

     11.  NO OTHER AGREEMENTS.  I affirm that I have no agreement with any 
other party that would preclude my compliance with my obligations under this 
Agreement as set forth above.

     12.  CHANGE OF CONTROL.  

     a.  DEFINITIONS.  The following definitions shall apply with respect to 
this "Change of Control" section only:

     (1)  AGREEMENT means the agreement governing Employee's employment by MBI
          of which this Change of Control section forms a part and which may be
          referred to as an Employment Agreement or an Invention and
          Confidentiality Agreement or by some similar name.

     (2)  BASE SALARY means Employee's annual compensation, exclusive of
          bonuses, stock options and other fringe benefits.

     (3)  CHANGE OF CONTROL means an event or the last of a series of related
          events by which:

                                       3

<PAGE>

          (A)  any person or group (as defined in Section 13(d) of the Exchange
               Act) who, together with all affiliates and associates (as defined
               in Rule 12b-2 under the Exchange Act) (an "Acquiring Person)
               becomes the direct or indirect beneficial owner of 25% or more of
               MBI's outstanding stock (or of 25% or more of MBI's outstanding
               voting stock, if and when MBI has more than one class of stock
               outstanding); OR

          (B)  Continuing Directors cease to comprise a majority of the Board of
               Directors.  A Continuing Director is any director who (while a
               director) is not an Acquiring Person or an affiliate or associate
               of an Acquiring Person or a representative thereof and who (A) is
               a director as of the date that the Agreement (containing this
               Change of Control section) is executed by both parties, or (B)
               subsequently becomes a director and whose nomination for election
               by MBI's stockholders (or whose election by the Board, in case of
               a vacancy filled by the Board) was approved by a resolution of a
               majority of the Continuing Directors or who is included as a
               nominee in a proxy statement of MBI when a majority of the Board
               consists of Continuing Directors.

     (4)  CONSTRUCTIVE TERMINATION means a termination of the Agreement by
          Employee within 2 years after a Change of Control, during which 2-year
          period any of the following events take place: (i) a material
          reduction in the total annual compensation package paid to Employee
          immediately prior to the Change of Control; (ii) a relocation (or
          demand for relocation) of Employee's place of employment more than 30
          miles from his current place of employment; or (iii) a significant
          change in the nature or scope of Employee's job responsibilities or
          the imposition of significant limitations on his autonomy in his
          position as an employee of MBI, as compared to the nature, scope and
          degree of autonomy prior to the Change of Control.     

     (5)  EXCHANGE ACT means the Securities Exchange Act of 1934, as amended,
          and the rules and regulations promulgated thereunder.

     (6)  INVOLUNTARY TERMINATION shall be deemed to have taken place if
          Employee dies or if the Employee has a physical or mental condition as
          a result of injury, illness or disease which prevents Employee from
          performing substantially all of his duties or from working on a
          substantially full-time basis, for a period of 24 consecutive weeks or
          28 weeks out of any 52-week period.

     (7)  SEVERANCE PAYMENTS is defined in subsection (b) below.

     (8)  TERMINATION FOR CAUSE means a termination of the Agreement by MBI
          because of any of the following conduct engaged in by Employee: (i)
          the commission of a felony or a crime involving moral turpitude or the
          commission of an act involving dishonesty or fraud with respect to MBI
          or its affiliates, if any; (ii) conduct tending to bring MBI

                                       4

<PAGE>

          or its affiliates, if any, into substantial public disgrace or 
          disrepute; or (iii) substantial and repeated failure to perform
          duties as reasonably directed by the Board of Directors or President
          of MBI or its affiliates, if any.

     (9)  TERMINATION WITHOUT CAUSE means any termination of the Agreement by
          MBI, other than a Termination for Cause or an Involuntary Termination.

     b.  SEVERANCE PAYMENTS AND OTHER BENEFITS IN THE EVENT OF TERMINATION.  
In the event of the termination of the Agreement a result of (i) a 
Termination Without Cause within 2 years following a Change of Control or 
(ii) a Constructive Termination, MBI shall provide the payments and other 
benefits specified below to Employee, in lieu of any other payments or 
benefits which may (or may not) be provided for elsewhere in the Agreement.
  
     (1) MBI shall make the following payments to Employee (or to his estate):

          (a)  ACCRUED SALARY.  MBI shall pay Employee's Base Salary through the
          effective date of termination of the Agreement.

          (b) SEVERANCE PAYMENTS.   MBI shall pay an amount equal to 1.5 times
          (A) the Base Salary in effect immediately prior to the Change of
          Control and (B) the higher of (x) 100% of Employee's target bonus as
          determined under MBI's incentive compensation plan or (y) an average
          of the three most recent bonuses awarded to Employee (collectively,
          referred to as "Severance Payments"). 

          (c) MANNER OF PAYMENT.  Severance Payments shall be paid over an 
          18-month period in approximately equal consecutive bi-weekly
          installments, with the first payment to be made no later than 30 days
          following the effective date of termination of the Agreement.

          (d) ABSOLUTE RIGHT TO SEVERANCE PAYMENTS.  Employee's right to
          Severance Payments shall not be conditioned upon compliance with any
          non-competition  provisions which may (or may not) exist elsewhere in
          the Agreement.
   
     (2)  MBI shall provide the following benefits to Employee:

          (1) COBRA BENEFITS.   During the period of time in which Severance
          Payments are being paid to the employee, MBI shall provide COBRA
          continuation coverage to Employee and dependents of Employee who are
          insured at the time of termination under its medical, dental and
          vision insurance plans and shall assume the cost of continuation
          coverage provided to Employee and covered dependent.  

                                       5

<PAGE>

          (2) OUTPLACEMENT SERVICES.  MBI will make available to Employee, upon
          his request, outplacement services provided by a reputable
          outplacement counselor selected by MBI for a period of 6 months
          following his termination. MBI will assume the cost of all such
          outplacement services.

     c.  ACCELERATION OF STOCK OPTIONS IN THE EVENT OF A CHANGE OF CONTROL.  
In the event of a Change of Control (whether or not followed by termination 
of the Agreement), all stock options under any MBI stock option plan which 
Employee holds at the time of such Change of Control shall become fully 
"vested" (I.E., immediately exercisable). 

     d.  LIMITATIONS.  The Severance Payments shall be reduced as necessary 
so that the present value, as determined in accordance with Section 
280G(d)(4) of the Internal Revenue Code, of the sum of (i) the Severance 
Payments and (ii) all other payments, if any, that must be taken into account 
for purposes of the computation under Section 280G(b)(2)(A)(ii) of the 
Internal Revenue Code in respect of Employee does not exceed 2.99 times 
Employee's base amount, as "base amount" is defined in  Section 280G(b)(3) of 
the Internal Revenue Code.

     13.  EXCLUSIVITY.  I shall not, while employed by the Company engage in 
any other employment or business venture for my account or on behalf of 
others that relates, directly or indirectly, to the business and affairs of 
the Company without the prior written consent of the Company.

     14.  EXPENSES.  The Company shall pay or reimburse the Employee for 
expenses incurred by him on behalf of the Company with its approval.  Such 
reimbursement shall be made upon presentation by the Employee to the Company 
of itemized accounts or receipts satisfactory to the Company.  The Employee's 
obligations with respect to his performance hereunder are unconditional and 
are not dependent upon such reimbursement.  The Company reserves the right to 
charge back to the Employee any expense reimbursement found to be non-tax 
deductible by the Company or found to have been falsely or improperly claimed 
by him.

     15.  PROHIBITION AGAINST ASSIGNMENT.  I agree that this Agreement and  
the rights, interests and benefits hereunder shall not be assigned, 
transferred, pledged or hypothecated in any way by me or any executor, 
administrator, heir, legatee, distributee or any other person claiming under 
me by virtue of this Agreement and shall not be subject to execution, 
attachment or similar process. Any attempt to assign, transfer, pledge or 
hypothecate or otherwise dispose of this Agreement or of such rights, 
interests and benefits contrary to the foregoing provisions, or the levy of 
any attachment or similar process thereon shall be null and void and without 
effect and shall relieve the Company of any and all liability hereunder.

     16.  NOTICE.  Any and  all notices, designations, consents, offers,
acceptances or any other communication provided for herein shall be given in
writing by registered or certified mail, return receipt requested, which shall
be addressed, in the case of the Company, to its office in San Diego,
California, and in my case to my last known place of residence as reflected on
the Company's records.

                                       6

<PAGE>


     17.  ENTIRE AGREEMENT.  This Agreement constitutes the entire agreement 
between me and the Company and contains all of the agreements between us with 
respect to the subject matter hereof.

     18.  BINDING EFFECT.  This Agreement shall be binding upon and inure to 
the benefit of me and the Company and our respective heirs, legal 
representatives, executors, administrators, and successors.

     19.  GOVERNING LAW.  This Agreement shall be subject to and governed by 
the laws of the State of California.

     20.  AMENDMENT OF AGREEMENT.  No change or modification of this  
Agreement shall be valid unless the same be in writing and signed by me and 
the Company. No waiver of any provision of this Agreement shall be valid 
unless in writing and signed by the person or party to be charged.

     21.  SEVERABILITY.  If any portion or portions of this Agreement shall 
be, for any reason, deemed to be invalid or unenforceable, the remaining 
portion or portions shall nevertheless be valid, enforceable and carried into 
effect, unless to do so would clearly violate the present legal and valid 
intention of the parties hereto.

     22.  BREACH.  In the event I breach this Agreement and the Company 
prevails in an action to enforce the terms of this Agreement, I agree to pay 
to the Company all reasonable attorneys' fees and costs incurred by the 
Company in prosecuting such action, and all damages suffered by the Company 
as well as any gain or profit derived by me as a result of any such breach.

     23.  HEADINGS.  The headings of this Agreement are inserted for 
convenience only and are not to be considered in construction of the 
provisions hereof.

     24.  WAIVER OR BREACH.  The waiver by either of the parties hereto of 
any breach of any provision hereof shall not be construed to be a waiver of 
any succeeding breach of that provision or a waiver of any other provision of 
this Agreement.

     25.  PRIOR AGREEMENTS.  This Agreement supersedes any and all prior 
agreements between the Company and Employee with respect to the subject 
matter hereof, including, but not limited to all Employment Agreements and/or 
Invention and Confidentiality Agreements or any amendment thereto.

     26.  GENERIC DRUG ENFORCEMENT ACT CERTIFICATION.  The undersigned, 
certifies that he or she (1) has never been charged with or convicted of a 
federal felony for conduct relating to the development, approval, or 
regulation of any drug product or device regulated by the United States Food 
and Drug Administration, and (2) has never been debarred or subject to a 
debarment proceeding under the Generic Drug Enforcement Act of 1992.

                                       7

<PAGE>

     WHEREAS, the parties have executed this Agreement as of the date first
above written.

                                   MOLECULAR BIOSYSTEMS, INC.



                                   By:  /s/ Bobba Venkatadri
                                        ------------------------
                                        Bobba Venkatadri 
                                        Chief Executive Officer



                                   By:  /s/ Gerard A. Wills
                                        ------------------------
                                        Gerard A. Wills



                                       8


<PAGE>


                                                                   EXHIBIT 10.39
                                       
                             EMPLOYMENT AGREEMENT

     EMPLOYMENT AGREEMENT dated as of September 1, 1997, between WILLIAM I. 
RAMAGE, an individual ("Employee"), and MOLECULAR BIOSYSTEMS, INC., a 
Delaware corporation ("the Company").

     1.   EMPLOYMENT.  The Company hereby employs the Employee as its Vice 
President, Marketing, to provide services at such times as shall be mutually 
agreed upon between them.  The Company shall be entitled to all of the 
benefits and profits arising from or incident to the work, services and 
advice rendered by the Employee relating to the work performed for the 
Company.  The Employee shall make all information available to the Company 
that relates to the Company's business of which he has any knowledge and 
shall not use any such information or the benefits of any such information 
for his personal profit or that of any third party.  The Employee agrees to 
use his best efforts to promote the interests of the Company including, where 
appropriate, the publication of articles in medical and scientific journals 
and the participation in medical and scientific seminars and symposiums 
relating to the business and affairs of the Company and/or his research 
efforts performed for and on behalf of the Company. The Employee shall 
perform the duties of employment in a manner satisfactory to the Company and 
shall devote his full working time to such duties.

     2.   DISCLOSURES.  I shall promptly disclose in writing to the 
officials designated by the Company to receive such disclosures, complete 
information concerning each and every invention, discovery, improvement, 
device, design, apparatus, practice, process, method or product (hereinafter 
referred to as "Inventions"), whether I consider them patentable or not, 
made, developed, perfected, devised, conceived or reduced to practice by me, 
either solely or in collaboration with others, during the period of my 
employment by the Company, and up to and including a period of twelve (12) 
months after termination of my employment, whether or not during regular 
working hours, relating either directly or indirectly to the business, 
products, practices or techniques of the Company or to the Company's actual 
or demonstrably anticipated research or development, or resulting from any 
work performed by me for the Company or with the equipment, supplies, 
facilities or confidential information of the Company.

     3.   CONFIDENTIALITY.  I recognize that my employment with the Company 
will involve contact with information of substantial value to the Company, 
which is not old and generally known in the trade and which gives the Company 
an advantage over its competitors who do not know or use it, including but 
not limited to techniques, designs, drawings, processes, inventions, 
developments, equipment, prototypes, sales and customer information, and 
business and financial information, relating to the business, products, 
practices or techniques of the Company (hereinafter referred to as 
"Confidential Information").  I shall at all times regard and preserve as 
confidential such Confidential Information obtained by me from whatever 
source and shall not, either during my 


                                       1

<PAGE>

employment or thereafter, publish or disclose any part of such Confidential 
Information in any manner, or use the same except on behalf of the Company, 
without the prior written consent of the Company.  Further, I shall, during 
my employment and thereafter, refrain from any acts or omissions that would 
reduce the value of such Confidential Information to the Company.

     4.   ASSIGNMENT OF RIGHTS.  I hereby agree that any Inventions made, 
developed, perfected, devised, conceived or reduced to practice by me during 
the period of my employment by the Company, and any other Inventions made, 
developed, perfected, devised, conceived or reduced to practice by me during 
said period of twelve (12) months after termination of my employment if based 
upon the Confidential Information of the Company, relating either directly or 
indirectly to the business, products, practices or techniques of the Company 
or to the Company's actual or demonstrably anticipated research or 
development, or resulting from any work performed by me for the Company or 
with the equipment, supplies, facilities or Confidential Information of the 
Company, are the sole property of the Company, and hereby assign and agree to 
assign to the Company, its successors and assigns, all of my right, title and 
interest in and to said Inventions, and any patent applications or Letters 
Patent thereon.

                                       
                                 NOTIFICATION
                                 ____________

     This Agreement does  not apply to an invention for which no equipment, 
supplies, facility, or trade secret information of the Company was used and 
which was developed entirely on my own time, and (a) which does not relate 
(1) to the business of the Company or (2) to the Company's actual or 
demonstrably anticipated research or development, or (b) which does not 
result from any work performed by me for the Company, as defined and provided 
by Section 2870 of the California Labor Code.

     5.   COVENANT OF COOPERATION.  I shall, at any time during employment 
or thereafter, upon request and without further compensation therefor, but at 
no expense to me, do all lawful acts, including but not limited to the 
execution of papers and oaths, the giving of testimony, and the obtaining of 
evidence that in the opinion of the Company, its successors or assigns, may 
be necessary or desirable for obtaining, sustaining, reissuing or enforcing 
Letters Patent in the United States and throughout the world for said 
Inventions, and for perfecting, recording or maintaining the title of the 
Company, its successors and assigns, to said Inventions and to any patent 
applications made and any Letters Patent granted for said Inventions in the 
United States and throughout the world.

     6.   PATENT ENFORCEMENT.  The Company shall have the sole discretion 
whether to obtain, maintain, modify or enforce any domestic or foreign patent 
for said Inventions assigned to the Company pursuant to this Agreement.  The 
Company is free to enter into any licensing or assignment agreement with any 
third party or to use whatever means it deems best to develop, promote or 
market said Inventions assigned to the Company pursuant to this Agreement or 
any domestic or foreign patent thereof.


                                      2

<PAGE>


     7.   CLAIMS BY THIRD PARTY.  As to any Inventions which were made, 
developed, perfected, devised, conceived or reduced to practice by me during 
the period of my employment by the Company, and up to and including a period 
of twelve (12) months after termination of my employment, but which are 
claimed for any reason to belong to an entity or person other than the 
Company, I will promptly disclose the same in writing to the Company and 
shall not disclose the same to others if the Company, within twenty (20) days 
thereafter, shall claim ownership of such Inventions under the terms of this 
Agreement.  If the Company makes such a claim, I agree that any controversy 
relating to such claim shall be settled and determined by binding arbitration 
conducted in San Diego, California, in accordance with the rules of the 
Judicial Arbitration and Mediation Services then existing.  The cost of 
arbitration shall be shared equally.

     8.   RECORD KEEPING.  I shall keep complete, accurate and authentic 
accounts, notes, data and records of any and all of said Inventions in the 
manner and form requested by the Company.  Such accounts, notes, data and 
records, including all copies thereof, shall be the property of the Company, 
and upon its request, I will promptly surrender the same to it, or if not 
previously surrendered, I will promptly surrender the same to the Company at 
the conclusion of my employment.

     9.   RECORDS PROPERTY OF COMPANY.  I agree that all accounts, notes, 
data sketches, drawings and other documents and records, and all material and 
physical items of any kind, including all reproductions and copies thereof, 
which relate in any way to the business, products, practices or techniques of 
the Company or contain Confidential Information, made by me or that come into 
my possession by reason of my employment are the property of the Company and 
shall be promptly surrendered to the Company at the conclusion of my 
employment.

     10.  INDUCEMENT.  I agree that I shall not disclose to the Company or 
induce the Company to use an invention or confidential information belonging 
to any third party.

     11.  NO OTHER AGREEMENTS.  I affirm that I have no agreement with any 
other party that would preclude my compliance with my obligations under this 
Agreement as set forth above.

     12.  CHANGE OF CONTROL.  

     a.  DEFINITIONS.  The following definitions shall apply with respect to
this "Change of Control" section only:

     (1)  AGREEMENT means the agreement governing Employee's employment by MBI
          of which this Change of Control section forms a part and which may be
          referred to as an Employment Agreement or an Invention and
          Confidentiality Agreement or by some similar name.   

     (2)  BASE SALARY means Employee's annual compensation, exclusive of
          bonuses, stock options and other fringe benefits.

                                       3

<PAGE>

     (3)  CHANGE OF CONTROL means an event or the last of a series of related
          events by which:

          (A)  any person or group (as defined in Section 13(d) of the Exchange
               Act) who, together with all affiliates and associates (as defined
               in Rule 12b-2 under the Exchange Act) (an "Acquiring Person)
               becomes the direct or indirect beneficial owner of 25% or more of
               MBI's outstanding stock (or of 25% or more of MBI's outstanding
               voting stock, if and when MBI has more than one class of stock
               outstanding); OR

          (B)  Continuing Directors cease to comprise a majority of the Board of
               Directors.  A Continuing Director is any director who (while a
               director) is not an Acquiring Person or an affiliate or associate
               of an Acquiring Person or a representative thereof and who (A) is
               a director as of the date that the Agreement (containing this
               Change of Control section) is executed by both parties, or (B)
               subsequently becomes a director and whose nomination for election
               by MBI's stockholders (or whose election by the Board, in case of
               a vacancy filled by the Board) was approved by a resolution of a
               majority of the Continuing Directors or who is included as a
               nominee in a proxy statement of MBI when a majority of the Board
               consists of Continuing Directors.

     (4)  CONSTRUCTIVE TERMINATION means a termination of the Agreement by
          Employee within 2 years after a Change of Control, during which 2-year
          period any of the following events take place: (I) a material
          reduction in the total annual compensation package paid to Employee
          immediately prior to the Change of Control; (ii) a relocation (or
          demand for relocation) of Employee's place of employment more than 30
          miles from his current place of employment; or (iii) a significant
          change in the nature or scope of Employee's job responsibilities or
          the imposition of significant limitations on his autonomy in his
          position as an employee of MBI, as compared to the nature, scope and
          degree of autonomy prior to the Change of Control.     

     (5)  EXCHANGE ACT means the Securities Exchange Act of 1934, as amended,
          and the rules and regulations promulgated thereunder.

     (6)  INVOLUNTARY TERMINATION shall be deemed to have taken place if
          Employee dies or if the Employee has a physical or mental condition as
          a result of injury, illness or disease which prevents Employee from
          performing substantially all of his duties or from working on a
          substantially full-time basis, for a period of 24 consecutive weeks or
          28 weeks out of any 52-week period.

     (7)  SEVERANCE PAYMENTS is defined in subsection (b) below.


                                      4

<PAGE>


     (8)  TERMINATION FOR CAUSE means a termination of the Agreement by MBI
          because of any of the following conduct engaged in by Employee: (I)
          the commission of a felony or a crime involving moral turpitude or the
          commission of an act involving dishonesty or fraud with respect to MBI
          or its affiliates, if any; (ii) conduct tending to bring MBI or its
          affiliates, if any, into substantial public disgrace or disrepute; or
          (iii) substantial and repeated failure to perform duties as reasonably
          directed by the Board of Directors or President of MBI or its
          affiliates, if any.

     (9)  TERMINATION WITHOUT CAUSE means any termination of the Agreement by
          MBI, other than a Termination for Cause or an Involuntary Termination.

     b.  SEVERANCE PAYMENTS AND OTHER BENEFITS IN THE EVENT OF TERMINATION.  In
the event of the termination of the Agreement a result of (i) a Termination
Without Cause within 2 years following a Change of Control or (ii) a
Constructive Termination, MBI shall provide the payments and other benefits
specified below to Employee, in lieu of any other payments or benefits which may
(or may not) be provided for elsewhere in the Agreement.

     (1) MBI shall make the following payments to Employee (or to his estate):

          (a) ACCRUED SALARY.  MBI shall pay Employee's Base Salary through the
          effective date of termination of the Agreement.

          (b) SEVERANCE PAYMENTS.   MBI shall pay an amount equal to 1.5 times
          (A) the Base Salary in effect immediately prior to the Change of
          Control and (B) the higher of (x) 100% of Employee's target bonus as
          determined under MBI's incentive compensation plan or (y) an average
          of the three most recent bonuses awarded to Employee (collectively,
          referred to as "Severance Payments"). 

          (c) MANNER OF PAYMENT.  Severance Payments shall be paid over an 
          18-month period in approximately equal consecutive bi-weekly
          installments, with the first payment to be made no later than 30 days
          following the effective date of termination of the Agreement.

          (d) ABSOLUTE RIGHT TO SEVERANCE PAYMENTS.  Employee's right to
          Severance Payments shall not be conditioned upon compliance with any
          non-competition  provisions which may (or may not) exist elsewhere in
          the Agreement.
   
     (2)  MBI shall provide the following benefits to Employee:

          (1) COBRA BENEFITS.   During the period of time in which Severance
          Payments are being paid to the employee, MBI shall provide COBRA
          continuation coverage to Employee and dependents of Employee who are
          insured at the time of termination under its medical, dental and
          vision insurance plans and shall assume the cost of 


                                       5

<PAGE>

          continuation coverage provided to Employee and covered dependent.


                                       6


<PAGE>

          (2) OUTPLACEMENT SERVICES.  MBI will make available to Employee, upon
          his request, outplacement services provided by a reputable
          outplacement counselor selected by MBI for a period of 6 months
          following his termination.  MBI will assume the cost of all such
          outplacement services.

     c.  ACCELERATION OF STOCK OPTIONS IN THE EVENT OF A CHANGE OF CONTROL.  In
the event of a Change of Control (whether or not followed by termination of the
Agreement), all stock options under any MBI stock option plan which Employee
holds at the time of such Change of Control shall become fully "vested" (I.E.,
immediately exercisable). 

     d.  LIMITATIONS.  The Severance Payments shall be reduced as necessary so
that the present value, as determined in accordance with Section 280G(d)(4) of
the Internal Revenue Code, of the sum of (I) the Severance Payments and (ii) all
other payments, if any, that must be taken into account for purposes of the
computation under Section 280G(b)(2)(A)(ii) of the Internal Revenue Code in
respect of Employee does not exceed 2.99 times Employee's base amount, as "base
amount" is defined in  Section 280G(b)(3) of the Internal Revenue Code.

     13.  EXCLUSIVITY.  I shall not, while employed by the Company engage in any
other employment or business venture for my account or on behalf of others that
relates, directly or indirectly, to the business and affairs of the Company
without the prior written consent of the Company.

     14.  ADDITIONAL PAYMENTS.  Employee shall receive each month through March,
1998, an amount equal to Dupont's COBRA family coverage premium (grossed-up). In
addition, Employee  shall receive a $20,000 cash bonus, minus applicable payroll
taxes, on April 1, in the years 1999, 2000 and 2001.  Employee must be employed
with the Company on each of those dates to receive these bonus payments.

     15.  EXPENSES.  The Company shall pay or reimburse the Employee for
expenses incurred by him on behalf of the Company with its approval.  Such
reimbursement shall be made upon presentation by the Employee to the Company of
itemized accounts or receipts satisfactory to the Company.  The Employee's
obligations with respect to his performance hereunder are unconditional and are
not dependent upon such reimbursement.  The Company reserves the right to charge
back to the Employee any expense reimbursement found to be non-tax deductible by
the Company or found to have been falsely or improperly claimed by him.

     16.  PROHIBITION AGAINST ASSIGNMENT.  I agree that this Agreement and  the
rights, interests and benefits hereunder shall not be assigned, transferred,
pledged or hypothecated in any way by me or any executor, administrator, heir,
legatee, distributee or any other person claiming under me by virtue of this
Agreement and shall not be subject to execution, attachment or similar process. 
Any attempt to assign, transfer, pledge or hypothecate or otherwise dispose of
this Agreement or of such rights, interests and benefits contrary to the
foregoing provisions, or the levy of any attachment or similar process thereon
shall be null and void and without effect and shall 


                                      7

<PAGE>


relieve the Company of any and all liability hereunder.

     17.  NOTICE.  Any and all notices, designations, consents, offers,
acceptances or any other communication provided for herein shall be given in
writing by registered or certified mail, return receipt requested, which shall
be addressed, in the case of the Company, to its office in San Diego,
California, and in my case to my last known place of residence as reflected on
the Company's records.

     18.  ENTIRE AGREEMENT.  This Agreement constitutes the entire agreement
between me and the Company and contains all of the agreements between us with
respect to the subject matter hereof.

     19.  BINDING EFFECT.  This Agreement shall be binding upon and inure to 
the benefit of me and the Company and our respective heirs, legal
representatives, executors, administrators, and successors.

     20.  GOVERNING LAW.  This Agreement shall be subject to and governed by 
the laws of the State of California.

     21.  AMENDMENT OF AGREEMENT.  No change or modification of this  Agreement
shall be valid unless the same be in writing and signed by me and the Company. 
No waiver of any provision of this Agreement shall be valid unless in writing
and signed by the person or party to be charged.

     22.  SEVERABILITY.  If any portion or portions of this Agreement shall be,
for any reason, deemed to be invalid or unenforceable, the remaining portion or
portions shall nevertheless be valid, enforceable and carried into effect,
unless to do so would clearly violate the present legal and valid intention of
the parties hereto.

     23.  BREACH.  In the event of any controversy, claim, or dispute between
the parties hereto, arising out of or relating to this Agreement or breach
thereof, the prevailing party shall be entitled to recover from the losing
party, reasonable expenses, attorney's fees and costs.

     24.  HEADINGS.  The headings of this Agreement are inserted for
convenience only and are not to be considered in construction of the provisions
hereof.

     25.  WAIVER OR BREACH.  The waiver by either of the parties hereto of any
breach of any provision hereof shall not be construed to be a waiver of any
succeeding breach of that provision or a waiver of any other provision of this
Agreement.

     26.  PRIOR AGREEMENTS.  This Agreement supersedes any and all prior
agreements between the Company and Employee with respect to the subject matter
hereof, including, but not limited to all Employment Agreements and/or Invention
and Confidentiality Agreements or any amendment thereto.

     27.  GENERIC DRUG ENFORCEMENT ACT CERTIFICATION.  The undersigned,
certifies that he or 


                                       8

<PAGE>

she (1) has never been charged with or convicted of a federal felony for 
conduct relating to the development, approval, or regulation of any drug 
product or device regulated by the United States Food and Drug 
Administration, and (2) has never been debarred or subject to a debarment 
proceeding under the Generic Drug Enforcement Act of 1992.

     WHEREAS, the parties have executed this Agreement as of the date first
above written.

                                   MOLECULAR BIOSYSTEMS, INC.



                                   By:  /s/ Bobba Venkatadri
                                        --------------------------------
                                        Bobba Venkatadri 
                                        Chief Executive Officer



                                   By:  /s/ William I. Ramage
                                        --------------------------------
                                        William I. Ramage


                                       9

<PAGE>

                                                                  EXHIBIT 10.40

                                 EMPLOYMENT AGREEMENT
     
     EMPLOYMENT AGREEMENT ("this Agreement') dated as of December 1, 1997, 
between THOMAS JURGENSEN, an individual ("Employee"), and MOLECULAR 
BIOSYSTEMS, INC., a Delaware corporation ("the Company").

     1.   EMPLOYMENT.  The Company hereby employs the Employee as its Vice 
President, Legal and General Counsel, to provide services at such times as 
shall be mutually agreed upon between them.  The Company shall be entitled to 
all of the benefits and profits arising from or incident to the work, 
services and advice rendered by the Employee relating to the work performed 
for the Company. The Employee shall make all information available to the 
Company that relates to the Company's business of which he has any knowledge 
and shall not use any such information or the benefits of any such 
information for his personal profit or that of any third party.  The Employee 
agrees to use his best efforts to promote the interests of the Company 
including, where appropriate, the publication of articles in medical and 
scientific journals and the participation in medical and scientific seminars 
and symposiums relating to the business and affairs of the Company and/or his 
research efforts performed for and on behalf of the Company. The Employee 
shall perform the duties of employment in a manner satisfactory to the 
Company and shall devote his full working time to such duties.

     2.   DISCLOSURES.  I shall promptly disclose  in writing to the 
officials designated by the Company to receive such disclosures, complete 
information concerning each and every invention, discovery, improvement, 
device, design, apparatus, practice, process, method or product (hereinafter 
referred to as "Inventions"), whether I consider them patentable or not, 
made, developed, perfected, devised, conceived or reduced to practice by me, 
either solely or in collaboration with others, during the period of my 
employment by the Company, and up to and including a period of twelve (12) 
months after termination of my employment, whether or not during regular 
working hours, relating either directly or indirectly to the business, 
products, practices or techniques of the Company or to the Company's actual 
or demonstrably anticipated research or development, or resulting from any 
work performed by me for the Company or with the equipment, supplies, 
facilities or confidential information of the Company.

     3.   CONFIDENTIALITY.  I recognize  that my employment with the Company
will involve contact with information of substantial value to the Company, which
is not old and generally known in the trade and which gives the Company an
advantage over its competitors who do not know or use it, including but not
limited to techniques, designs, drawings, processes, inventions, developments,
equipment, prototypes, sales and customer information, and business and
financial information, relating to the business, products, practices or
techniques of the Company (hereinafter referred to as "Confidential
Information").  I shall at all times regard and preserve as confidential such
Confidential Information obtained by me from whatever source and shall not,
either during my employment or thereafter, publish or disclose any part of such
Confidential Information in any

                                       1

<PAGE>

manner, or use the same except on behalf of the Company, without the prior 
written consent of the Company.  Further, I shall, during my employment and 
thereafter, refrain from any acts or omissions that would reduce the value of 
such Confidential Information to the Company.

     4.   ASSIGNMENT OF RIGHTS.  I hereby agree that any Inventions made, 
developed, perfected, devised, conceived or reduced to practice by me during 
the period of my employment by the Company, and any other Inventions made, 
developed, perfected, devised, conceived or reduced to practice by me during 
said period of twelve (12) months after termination of my employment if based 
upon the Confidential Information of the Company, relating either directly or 
indirectly to the business, products, practices or techniques of the Company 
or to the Company's actual or demonstrably anticipated research or 
development, or resulting from any work performed by me for the Company or 
with the equipment, supplies, facilities or Confidential Information of the 
Company, are the sole property of the Company, and hereby assign and agree to 
assign to the Company, its successors and assigns, all of my right, title and 
interest in and to said Inventions, and any patent applications or Letters 
Patent thereon.

                                     NOTIFICATION
                                     ____________

     This Agreement does  not apply to an invention for which no equipment, 
supplies, facility, or trade secret information of the Company was used and 
which was developed entirely on my own time, and (a) which does not relate 
(1) to the business of the Company or (2) to the Company's actual or 
demonstrably anticipated research or development, or (b) which does not 
result from any work performed by me for the Company, as defined and provided 
by Section 2870 of the California Labor Code.

     5.   COVENANT OF COOPERATION.  I  shall, at any time during employment 
or thereafter, upon request and without further compensation therefor, but at 
no expense to me, do all lawful acts, including but not limited to the 
execution of papers and oaths, the giving of testimony, and the obtaining of 
evidence that in the opinion of the Company, its successors or assigns, may 
be necessary or desirable for obtaining, sustaining, reissuing or enforcing 
Letters Patent in the United States and throughout the world for said 
Inventions, and for perfecting, recording or maintaining the title of the 
Company, its successors and assigns, to said Inventions and to any patent 
applications made and any Letters Patent granted for said Inventions in the 
United States and throughout the world.

     6.   PATENT ENFORCEMENT.  The Company  shall have the sole discretion 
whether to obtain, maintain, modify or enforce any domestic or foreign patent 
for said Inventions assigned to the Company pursuant to this Agreement.  The 
Company is free to enter into any licensing or assignment agreement with any 
third party or to use whatever means it deems best to develop, promote or 
market said Inventions assigned to the Company pursuant to this Agreement or 
any domestic or foreign patent thereof.

     7.   CLAIMS BY THIRD PARTY.  As to any Inventions which were made,
developed, perfected, devised, conceived or reduced to practice by me during the
period of my employment by the

                                       2

<PAGE>

Company, and up to and including a period of twelve (12) months after 
termination of my employment, but which are claimed for any reason to belong 
to an entity or person other than the Company, I will promptly disclose the 
same in writing to the Company and shall not disclose the same to others if 
the Company, within twenty (20) days thereafter, shall claim ownership of 
such Inventions under the terms of this Agreement.  If the Company makes such 
a claim, I agree that any controversy relating to such claim shall be settled 
and determined by binding arbitration conducted in San Diego, California, in 
accordance with the rules of the Judicial Arbitration and Mediation Services 
then existing.  The cost of arbitration shall be shared equally.

     8.   RECORD KEEPING.  I shall keep complete, accurate and authentic 
accounts, notes, data and records of any and all of said Inventions in the 
manner and form requested by the Company.  Such accounts, notes, data and 
records, including all copies thereof, shall be the property of the Company, 
and upon its request, I will promptly surrender the same to it, or if not 
previously surrendered, I will promptly surrender the same to the Company at 
the conclusion of my employment.

     9.   RECORDS PROPERTY OF COMPANY.  I agree  that all accounts, notes, 
data sketches, drawings and other documents and records, and all material and 
physical items of any kind, including all reproductions and copies thereof, 
which relate in any way to the business, products, practices or techniques of 
the Company or contain Confidential Information, made by me or that come into 
my possession by reason of my employment are the property of the Company and 
shall be promptly surrendered to the Company at the conclusion of my 
employment.

     10.  INDUCEMENT.  I agree that  I shall not disclose to the Company or 
induce the Company to use an invention or confidential information belonging 
to any third party.

     11.  NO OTHER AGREEMENTS.  I affirm  that I have no agreement with any 
other party that would preclude my compliance with my obligations under this 
Agreement as set forth above.

     12.  CHANGE OF CONTROL.  

     a.  DEFINITIONS.  The following definitions shall apply with respect to 
this "Change of Control" section only:

     (1)  AGREEMENT means the agreement governing Employee's employment by MBI
          of which this Change of Control section forms a part and which may be
          referred to as an Employment Agreement or an Invention and
          Confidentiality Agreement or by some similar name.   

     (2)  BASE SALARY means Employee's annual compensation, exclusive of
          bonuses, stock options and other fringe benefits.

     (3)  CHANGE OF CONTROL means an event or the last of a series of related
          events by which:

                                       3

<PAGE>

          (A)  any person or group (as defined in Section 13(d) of the Exchange
               Act) who, together with all affiliates and associates (as defined
               in Rule 12b-2 under the Exchange Act) (an "Acquiring Person)
               becomes the direct or indirect beneficial owner of 25% or more of
               MBI's outstanding stock (or of 25% or more of MBI's outstanding
               voting stock, if and when MBI has more than one class of stock
               outstanding); OR

          (B)  Continuing Directors cease to comprise a majority of the Board of
               Directors.  A Continuing Director is any director who (while a
               director) is not an Acquiring Person or an affiliate or associate
               of an Acquiring Person or a representative thereof and who (A) is
               a director as of the date that the Agreement (containing this
               Change of Control section) is executed by both parties, or (B)
               subsequently becomes a director and whose nomination for election
               by MBI's stockholders (or whose election by the Board, in case of
               a vacancy filled by the Board) was approved by a resolution of a
               majority of the Continuing Directors or who is included as a
               nominee in a proxy statement of MBI when a majority of the Board
               consists of Continuing Directors.

     (4)  CONSTRUCTIVE TERMINATION means a termination of the Agreement by
          Employee within 2 years after a Change of Control, during which 2-year
          period any of the following events take place: (i) a material
          reduction in the total annual compensation package paid to Employee
          immediately prior to the Change of Control; (ii) a relocation (or
          demand for relocation) of Employee's place of employment more than 30
          miles from his current place of employment; or (iii) a significant
          change in the nature or scope of Employee's job responsibilities or
          the imposition of significant limitations on his autonomy in his
          position as an employee of MBI, as compared to the nature, scope and
          degree of autonomy prior to the Change of Control.     

     (5)  EXCHANGE ACT means the Securities Exchange Act of 1934, as amended,
          and the rules and regulations promulgated thereunder.

     (6)  INVOLUNTARY TERMINATION shall be deemed to have taken place if
          Employee dies or if the Employee has a physical or mental condition as
          a result of injury, illness or disease which prevents Employee from
          performing substantially all of his duties or from working on a
          substantially full-time basis, for a period of 24 consecutive weeks or
          28 weeks out of any 52-week period.

     (7)  SEVERANCE PAYMENTS is defined in subsection (b) below.

     (8)  TERMINATION FOR CAUSE means a termination of the Agreement by MBI
          because of any of the following conduct engaged in by Employee: (i)
          the commission of a felony or

                                       4

<PAGE>


          a crime involving moral turpitude or the commission of an act 
          involving dishonesty or fraud with respect to MBI or its affiliates,
          if any; (ii) conduct tending to bring MBI or its affiliates, if any, 
          into substantial public disgrace or disrepute; or (iii) substantial
          and repeated failure to perform duties as reasonably directed by the
          Board of Directors or President of MBI or its affiliates, if any.

     (9)  TERMINATION WITHOUT CAUSE means any termination of the Agreement by
          MBI, other than a Termination for Cause or an Involuntary Termination.

     b.  SEVERANCE PAYMENTS AND OTHER BENEFITS IN THE EVENT OF TERMINATION.  
In the event of the termination of the Agreement a result of (i) a 
Termination Without Cause within 2 years following a Change of Control or 
(ii) a Constructive Termination, MBI shall provide the payments and other 
benefits specified below to Employee, in lieu of any other payments or 
benefits which may (or may not) be provided for elsewhere in the Agreement.

     (1) MBI shall make the following payments to Employee (or to his estate):

           (a)  ACCRUED SALARY.  MBI shall pay Employee's Base Salary through 
           the effective date of termination of the Agreement.

           (b) SEVERANCE PAYMENTS.   MBI shall pay an amount equal to 1.5 times
           (A) the Base Salary in effect immediately prior to the Change of
           Control and (B) the higher of (x) 100% of Employee's target bonus as
           determined under MBI's incentive compensation plan or (y) an average
           of the three most recent bonuses awarded to Employee (collectively,
           referred to as "Severance Payments"). 

           (c) MANNER OF PAYMENT.  Severance Payments shall be paid over an 
           18-month period in approximately equal consecutive bi-weekly
           installments, with the first payment to be made no later than 30 days
           following the effective date of termination of the Agreement.

           (d) ABSOLUTE RIGHT TO SEVERANCE PAYMENTS.  Employee's right to
           Severance Payments shall not be conditioned upon compliance with any
           non-competition  provisions which may (or may not) exist elsewhere in
           the Agreement.
   
     (2) MBI shall provide the following benefits to Employee:

           (1) COBRA BENEFITS.   MBI shall provide COBRA continuation coverage 
           to Employee under its medical, dental and vision insurance plans and
           shall assume the cost of continuation coverage provided to Employee
           (but not to his family).  In the event that Employee maintains family
           coverage under any of the aforementioned plans or policies, Employee
           shall be responsible for payment of the difference in cost between
           individual coverage and family coverage, which amount may be deducted


                                       5

<PAGE>

           by MBI from the Change of Control Severance Payments.  In the event
           that Change of Control Severance Payments have ceased, Employee shall
           reimburse MBI for the difference in cost between individual coverage
           and family coverage by the first day of each month that continuation
           coverage benefits are provided.  

           (2) OUTPLACEMENT SERVICES.  MBI will make available to Employee, upon
           his request, outplacement services provided by a reputable
           outplacement counselor selected by MBI for a period of 6 months
           following his termination.    MBI will assume the cost of all such
           outplacement services.

     c.  ACCELERATION OF STOCK OPTIONS IN THE EVENT OF A CHANGE OF CONTROL.  
In the event of a Change of Control (whether or not followed by termination 
of the Agreement), all stock options under any MBI stock option plan which 
Employee holds at the time of such Change of Control shall become fully 
"vested" (I.E., immediately exercisable). 

     d.  LIMITATIONS.  The Severance Payments shall be reduced as necessary 
so that the present value, as determined in accordance with Section 
280G(d)(4) of the Internal Revenue Code, of the sum of (i) the Severance 
Payments and (ii) all other payments, if any, that must be taken into account 
for purposes of the computation under Section 280G(b)(2)(A)(ii) of the 
Internal Revenue Code in respect of Employee does not exceed 2.99 times 
Employee's base amount, as "base amount" is defined in  Section 280G(b)(3) of 
the Internal Revenue Code.

     13.  EXCLUSIVITY.  I shall not, while employed by the Company engage in 
any other employment or business venture for my account or on behalf of 
others that relates, directly or indirectly, to the business and affairs of 
the Company without the prior written consent of the Company.

     14.  SEVERANCE.  In the event Employee is involuntarily terminated for 
reasons other than for cause, Employee shall receive as a severance, payable 
in bi-weekly installments, six months' salary at the then-current rate.  This 
paragraph shall not be applicable if Employee's termination is as a result of 
a Change of Control as decribed in Paragraph 12.

     15.  EXPENSES.  The Company shall pay  or reimburse the Employee for 
expenses incurred by him on behalf of the Company with its approval.  Such 
reimbursement shall be made upon presentation by the Employee to the Company 
of itemized accounts or receipts satisfactory to the Company.  The Employee's 
obligations with respect to his performance hereunder are unconditional and 
are not dependent upon such reimbursement.  The Company reserves the right to 
charge back to the Employee any expense reimbursement found to be non-tax 
deductible by the Company or found to have been falsely or improperly claimed 
by him.

     16.  PROHIBITION AGAINST ASSIGNMENT.  I agree that  this Agreement and  
the rights, interests and benefits hereunder shall not be assigned, 
transferred, pledged or hypothecated in any way by me or any executor, 
administrator, heir, legatee, distributee or any other person claiming

                                       6

<PAGE>

under me by virtue of this Agreement and shall not be subject to execution, 
attachment or similar process. Any attempt to assign, transfer, pledge or 
hypothecate or otherwise dispose of this Agreement or of such rights, 
interests and benefits contrary to the foregoing provisions, or the levy of 
any attachment or similar process thereon shall be null and void and without 
effect and shall relieve the Company of any and all liability hereunder.

     17.  NOTICE.  Any and  all notices, designations, consents, offers, 
acceptances or any other communication provided for herein shall be given in 
writing by registered or certified mail, return receipt requested, which 
shall be addressed, in the case of the Company, to its office in San Diego, 
California, and in my case to my last known place of residence as reflected 
on the Company's records.

     18.  ENTIRE AGREEMENT.  This Agreement constitutes the entire agreement 
between me and the Company and contains all of the agreements between us with 
respect to the subject matter hereof.

     19.  BINDING EFFECT.  This Agreement shall be binding upon and inure to 
the benefit of me and the Company and our respective heirs, legal 
representatives, executors, administrators, and successors.

     20.  GOVERNING LAW.  This Agreement shall be subject to and governed by 
the laws of the State of California.

     21.  AMENDMENT OF AGREEMENT.  No change  or modification of this  
Agreement shall be valid unless the same be in writing and signed by me and 
the Company. No waiver of any provision of this Agreement shall be valid 
unless in writing and signed by the person or party to be charged.

     22.  SEVERABILITY.  If any portion  or portions of this Agreement shall 
be, for any reason, deemed to be invalid or unenforceable, the remaining 
portion or portions shall nevertheless be valid, enforceable and carried into 
effect, unless to do so would clearly violate the present legal and valid 
intention of the parties hereto.

     23.  BREACH.  In the event I breach  this Agreement and the Company 
prevails in an action to enforce the terms of this Agreement, I agree to pay 
to the Company all reasonable attorneys' fees and costs incurred by the 
Company in prosecuting such action, and all damages suffered by the Company 
as well as any gain or profit derived by me as a result of any such breach.

     24.  HEADINGS.  The headings of this  Agreement are inserted for 
convenience only and are not to be considered in construction of the 
provisions hereof.

     25.  WAIVER OR BREACH.  The waiver  by either of the parties hereto of 
any breach of any provision hereof shall not be construed to be a waiver of 
any succeeding breach of that provision or a waiver of any other provision of 
this Agreement.

                                       7

<PAGE>


     26.  PRIOR AGREEMENTS.  This Agreement supersedes any and all prior 
agreements between the Company and Employee with respect to the subject 
matter hereof, including, but not limited to all Employment Agreements and/or 
Invention and Confidentiality Agreements or any amendment thereto.

     27.  GENERIC DRUG ENFORCEMENT ACT CERTIFICATION.  The undersigned, 
certifies that he or she (1) has never been charged with or convicted of a 
federal felony for conduct relating to the development, approval, or 
regulation of any drug product or device regulated by the United States Food 
and Drug Administration, and (2) has never been debarred or subject to a 
debarment proceeding under the Generic Drug Enforcement Act of 1992.

     WHEREAS, the parties have executed this Agreement as of the date first 
above written.

                                   MOLECULAR BIOSYSTEMS, INC.



                                   By:  /s/ Bobba Venkatadri
                                        -----------------------
                                        Bobba Venkatadri 
                                        Chief Executive Officer



                                   By:  /s/ Thomas Jurgensen
                                        -----------------------
                                        Thomas Jurgensen

                                       8

<PAGE>
                                                                   EXHIBIT 10.41

                                 EMPLOYMENT AGREEMENT


     EMPLOYMENT AGREEMENT dated as of September 1, 1997, between JONI HARVEY, 
an individual ("Employee"), and MOLECULAR BIOSYSTEMS, INC., a Delaware 
corporation ("the Company").

     1.   EMPLOYMENT.  The Company hereby employs the Employee as its 
Executive Director, Operations, to provide services at such times as shall be 
mutually agreed upon between them.  The Company shall be entitled to all of 
the benefits and profits arising from or incident to the work, services and 
advice rendered by the Employee relating to the work performed for the 
Company.  The Employee shall make all information available to the Company 
that relates to the Company's business of which he has any knowledge and 
shall not use any such information or the benefits of any such information 
for his personal profit or that of any third party.  The Employee agrees to 
use his best efforts to promote the interests of the Company including, where 
appropriate, the publication of articles in medical and scientific journals 
and the participation in medical and scientific seminars and symposiums 
relating to the business and affairs of the Company and/or his research 
efforts performed for and on behalf of the Company. The Employee shall 
perform the duties of employment in a manner satisfactory to the Company and 
shall devote his full working time to such duties.

     2.   DISCLOSURES.  I shall promptly disclose in writing to the officials 
designated by the Company to receive such disclosures, complete information 
concerning each and every invention, discovery, improvement, device, design, 
apparatus, practice, process, method or product (hereinafter referred to as 
"Inventions"), whether I consider them patentable or not, made, developed, 
perfected, devised, conceived or reduced to practice by me, either solely or 
in collaboration with others, during the period of my employment by the 
Company, and up to and including a period of twelve (12) months after 
termination of my employment, whether or not during regular working hours, 
relating either directly or indirectly to the business, products, practices 
or techniques of the Company or to the Company's actual or demonstrably 
anticipated research or development, or resulting from any work performed by 
me for the Company or with the equipment, supplies, facilities or 
confidential information of the Company.

     3.   CONFIDENTIALITY.  I recognize that my employment with the Company 
will involve contact with information of substantial value to the Company, 
which is not old and generally known in the trade and which gives the Company 
an advantage over its competitors who do not know or use it, including but 
not limited to techniques, designs, drawings, processes, inventions, 
developments, equipment, prototypes, sales and customer information, and 
business and financial information, relating to the business, products, 
practices or techniques of the Company (hereinafter referred to as 
"Confidential Information").  I shall at all times regard and preserve as 
confidential such Confidential Information obtained by me from whatever 
source and shall not, either during my

                                       1

<PAGE>


employment or thereafter, publish or disclose any part of such Confidential 
Information in any manner, or use the same except on behalf of the Company, 
without the prior written consent of the Company.  Further, I shall, during 
my employment and thereafter, refrain from any acts or omissions that would 
reduce the value of such Confidential Information to the Company.

     4.   ASSIGNMENT OF RIGHTS.  I hereby agree that any Inventions made, 
developed, perfected, devised, conceived or reduced to practice by me during 
the period of my employment by the Company, and any other Inventions made, 
developed, perfected, devised, conceived or reduced to practice by me during 
said period of twelve (12) months after termination of my employment if based 
upon the Confidential Information of the Company, relating either directly or 
indirectly to the business, products, practices or techniques of the Company 
or to the Company's actual or demonstrably anticipated research or 
development, or resulting from any work performed by me for the Company or 
with the equipment, supplies, facilities or Confidential Information of the 
Company, are the sole property of the Company, and hereby assign and agree to 
assign to the Company, its successors and assigns, all of my right, title and 
interest in and to said Inventions, and any patent applications or Letters 
Patent thereon.

                                     NOTIFICATION
                                     ____________

     This Agreement does not apply to an invention for which no equipment, 
supplies, facility, or trade secret information of the Company was used and 
which was developed entirely on my own time, and (a) which does not relate 
(1) to the business of the Company or (2) to the Company's actual or 
demonstrably anticipated research or development, or (b) which does not 
result from any work performed by me for the Company, as defined and provided 
by Section 2870 of the California Labor Code.

     5.   COVENANT OF COOPERATION.  I shall, at any time during employment or 
thereafter, upon request and without further compensation therefor, but at no 
expense to me, do all lawful acts, including but not limited to the execution 
of papers and oaths, the giving of testimony, and the obtaining of evidence 
that in the opinion of the Company, its successors or assigns, may be 
necessary or desirable for obtaining, sustaining, reissuing or enforcing 
Letters Patent in the United States and throughout the world for said 
Inventions, and for perfecting, recording or maintaining the title of the 
Company, its successors and assigns, to said Inventions and to any patent 
applications made and any Letters Patent granted for said Inventions in the 
United States and throughout the world.

     6.   PATENT ENFORCEMENT.  The Company shall have the sole discretion 
whether to obtain, maintain, modify or enforce any domestic or foreign patent
for said Inventions assigned to the Company pursuant to this Agreement.  The
Company is free to enter into any licensing or assignment agreement with any
third party or to use whatever means it deems best to develop, promote or market
said Inventions assigned to the Company pursuant to this Agreement or any
domestic or foreign patent thereof.

                                       2

<PAGE>

     7.   CLAIMS BY THIRD PARTY.  As to any Inventions which were made, 
developed, perfected, devised, conceived or reduced to practice by me during 
the period of my employment by the Company, and up to and including a period 
of twelve (12) months after termination of my employment, but which are 
claimed for any reason to belong to an entity or person other than the 
Company, I will promptly disclose the same in writing to the Company and 
shall not disclose the same to others if the Company, within twenty (20) days 
thereafter, shall claim ownership of such Inventions under the terms of this 
Agreement.  If the Company makes such a claim, I agree that any controversy 
relating to such claim shall be settled and determined by binding arbitration 
conducted in San Diego, California, in accordance with the rules of the 
Judicial Arbitration and Mediation Services then existing.  The cost of 
arbitration shall be shared equally.

     8.   RECORD KEEPING.  I shall keep complete, accurate and authentic 
accounts, notes, data and records of any and all of said Inventions in the 
manner and form requested by the Company.  Such accounts, notes, data and 
records, including all copies thereof, shall be the property of the Company, 
and upon its request, I will promptly surrender the same to it, or if not 
previously surrendered, I will promptly surrender the same to the Company at 
the conclusion of my employment.

     9.   RECORDS PROPERTY OF COMPANY.  I agree that all accounts, notes, 
data sketches, drawings and other documents and records, and all material and 
physical items of any kind, including all reproductions and copies thereof, 
which relate in any way to the business, products, practices or techniques of 
the Company or contain Confidential Information, made by me or that come into 
my possession by reason of my employment are the property of the Company and 
shall be promptly surrendered to the Company at the conclusion of my 
employment.

     10.  INDUCEMENT.  I agree that I shall not disclose to the Company or 
induce the Company to use an invention or confidential information belonging 
to any third party.

     11.  NO OTHER AGREEMENTS.  I affirm that I have no agreement with any 
other party that would preclude my compliance with my obligations under this 
Agreement as set forth above.

     12.  CHANGE OF CONTROL.

     a.  DEFINITIONS.  The following definitions shall apply with respect to 
this "Change of Control" section only:

     (1)  AGREEMENT means the agreement governing Employee's employment by MBI
          of which this Change of Control section forms a part and which may be
          referred to as an Employment Agreement or an Invention and
          Confidentiality Agreement or by some similar name.   

     (2)  BASE SALARY means Employee's annual compensation, exclusive of
          bonuses, stock options and other fringe benefits.

                                       3

<PAGE>

     (3)  CHANGE OF CONTROL means an event or the last of a series of related
          events by which:

          (A)  any person or group (as defined in Section 13(d) of the Exchange
               Act) who, together with all affiliates and associates (as defined
               in Rule 12b-2 under the Exchange Act) (an "Acquiring Person)
               becomes the direct or indirect beneficial owner of 25% or more of
               MBI's outstanding stock (or of 25% or more of MBI's outstanding
               voting stock, if and when MBI has more than one class of stock
               outstanding); OR

          (B)  Continuing Directors cease to comprise a majority of the Board of
               Directors.  A Continuing Director is any director who (while a
               director) is not an Acquiring Person or an affiliate or associate
               of an Acquiring Person or a representative thereof and who (A) is
               a director as of the date that the Agreement (containing this
               Change of Control section) is executed by both parties, or (B)
               subsequently becomes a director and whose nomination for election
               by MBI's stockholders (or whose election by the Board, in case of
               a vacancy filled by the Board) was approved by a resolution of a
               majority of the Continuing Directors or who is included as a
               nominee in a proxy statement of MBI when a majority of the Board
               consists of Continuing Directors.

     (4)  CONSTRUCTIVE TERMINATION means a termination of the Agreement by
          Employee within 2 years after a Change of Control, during which 2-year
          period any of the following events take place: (i) a material
          reduction in the total annual compensation package paid to Employee
          immediately prior to the Change of Control; (ii) a relocation (or
          demand for relocation) of Employee's place of employment more than 30
          miles from his current place of employment; or (iii) a significant
          change in the nature or scope of Employee's job responsibilities or
          the imposition of significant limitations on his autonomy in his
          position as an employee of MBI, as compared to the nature, scope and
          degree of autonomy prior to the Change of Control.     

     (5)  EXCHANGE ACT means the Securities Exchange Act of 1934, as amended,
          and the rules and regulations promulgated thereunder.

     (6)  INVOLUNTARY TERMINATION shall be deemed to have taken place if
          Employee dies or if the Employee has a physical or mental condition as
          a result of injury, illness or disease which prevents Employee from
          performing substantially all of his duties or from working on a
          substantially full-time basis, for a period of 24 consecutive weeks or
          28 weeks out of any 52-week period.

     (7)  SEVERANCE PAYMENTS is defined in subsection (b) below.


                                       4

<PAGE>

     (8)  TERMINATION FOR CAUSE means a termination of the Agreement by MBI
          because of any of the following conduct engaged in by Employee: (i)
          the commission of a felony or a crime involving moral turpitude or the
          commission of an act involving dishonesty or fraud with respect to MBI
          or its affiliates, if any; (ii) conduct tending to bring MBI or its
          affiliates, if any, into substantial public disgrace or disrepute; or
          (iii) substantial and repeated failure to perform duties as reasonably
          directed by the Board of Directors or President of MBI or its
          affiliates, if any.

     (9)  TERMINATION WITHOUT CAUSE means any termination of the Agreement by
          MBI, other than a Termination for Cause or an Involuntary Termination.

     b.  SEVERANCE PAYMENTS AND OTHER BENEFITS IN THE EVENT OF TERMINATION.  
In the event of the termination of the Agreement a result of (i) a 
Termination Without Cause within 2 years following a Change of Control or 
(ii) a Constructive Termination, MBI shall provide the payments and other 
benefits specified below to Employee, in lieu of any other payments or 
benefits which may (or may not) be provided for elsewhere in the Agreement.

     (1) MBI shall make the following payments to Employee (or to his estate):

          (a)  ACCRUED SALARY.  MBI shall pay Employee's Base Salary through the
          effective date of termination of the Agreement.

          (b) SEVERANCE PAYMENTS.   MBI shall pay an amount equal to 1.5 times
          (A) the Base Salary in effect immediately prior to the Change of
          Control and (B) the higher of (x) 100% of Employee's target bonus as
          determined under MBI's incentive compensation plan or (y) an average
          of the three most recent bonuses awarded to Employee (collectively,
          referred to as "Severance Payments"). 

          (c) MANNER OF PAYMENT.  Severance Payments shall be paid over an 
          18-month period in approximately equal consecutive bi-weekly
          installments, with the first payment to be made no later than 30 days
          following the effective date of termination of the Agreement.

          (d) ABSOLUTE RIGHT TO SEVERANCE PAYMENTS.  Employee's right to
          Severance Payments shall not be conditioned upon compliance with any
          non-competition  provisions which may (or may not) exist elsewhere in
          the Agreement.
   
     (2)  MBI shall provide the following benefits to Employee:

          (1) COBRA BENEFITS.  During the period of time in which Severance
          Payments are being paid to the employee, MBI shall provide COBRA
          continuation coverage to Employee and dependents of Employee who are
          insured at the time of termination under its medical, dental and
          vision insurance plans and shall assume the cost of

                                       5

<PAGE>

          continuation coverage provided to Employee and covered dependent.



                                       6
<PAGE>

          (2) OUTPLACEMENT SERVICES.  MBI will make available to Employee, upon
          his request, outplacement services provided by a reputable
          outplacement counselor selected by MBI for a period of 6 months
          following his termination.    MBI will assume the cost of all such
          outplacement services.

     c.  ACCELERATION OF STOCK OPTIONS IN THE EVENT OF A CHANGE OF CONTROL.  
In the event of a Change of Control (whether or not followed by termination 
of the Agreement), all stock options under any MBI stock option plan which 
Employee holds at the time of such Change of Control shall become fully 
"vested" (I.E., immediately exercisable). 

     d.  LIMITATIONS.  The Severance Payments shall be reduced as necessary 
so that the present value, as determined in accordance with Section 
280G(d)(4) of the Internal Revenue Code, of the sum of (i) the Severance 
Payments and (ii) all other payments, if any, that must be taken into account 
for purposes of the computation under Section 280G(b)(2)(A)(ii) of the 
Internal Revenue Code in respect of Employee does not exceed 2.99 times 
Employee's base amount, as "base amount" is defined in  Section 280G(b)(3) of 
the Internal Revenue Code.

     13.  EXCLUSIVITY.  I shall not, while employed by the Company engage in 
any other employment or business venture for my account or on behalf of 
others that relates, directly or indirectly, to the business and affairs of 
the Company without the prior written consent of the Company.

     14.  SEVERANCE.  In the event Employee is involuntarily terminated for 
any reason except  dishonesty, defalcation, or gross misconduct, Employee 
shall receive as a severance, payable in bi-weekly installments, six months' 
salary at her then-current rate, but in no event at a rate less than her rate 
at her date of hire.  This paragraph shall not be applicable if Employee's 
termination is as a result of a Change of Control as decribed in Paragraph 12.

     15.  EXPENSES.  The Company shall pay or reimburse the Employee for 
expenses incurred by him on behalf of the Company with its approval.  Such 
reimbursement shall be made upon presentation by the Employee to the Company 
of itemized accounts or receipts satisfactory to the Company.  The Employee's 
obligations with respect to his performance hereunder are unconditional and 
are not dependent upon such reimbursement.  The Company reserves the right to 
charge back to the Employee any expense reimbursement found to be non-tax 
deductible by the Company or found to have been falsely or improperly claimed 
by him.

     16.  PROHIBITION AGAINST ASSIGNMENT.  I agree that this Agreement and  
the rights, interests and benefits hereunder shall not be assigned, 
transferred, pledged or hypothecated in any way by me or any executor, 
administrator, heir, legatee, distributee or any other person claiming under 
me by virtue of this Agreement and shall not be subject to execution, 
attachment or similar process. Any attempt to assign, transfer, pledge or 
hypothecate or otherwise dispose of this Agreement or of such rights, 
interests and benefits contrary to the foregoing provisions, or the levy of 
any attachment or similar process thereon shall be null and void and without 
effect and shall 

                                       7

<PAGE>

relieve the Company of any and all liability hereunder.      

17.  NOTICE.  Any and  all notices, designations, consents, offers, 
acceptances or any other communication provided for herein shall be given in 
writing by registered or certified mail, return receipt requested, which 
shall be addressed, in the case of the Company, to its office in San Diego, 
California, and in my case to my last known place of residence as reflected 
on the Company's records.

     18.  ENTIRE AGREEMENT.  This Agreement constitutes the entire agreement 
between me and the Company and contains all of the agreements between us with 
respect to the subject matter hereof.

     19.  BINDING EFFECT.  This Agreement shall be binding upon and inure to 
the benefit of me and the Company and our respective heirs, legal 
representatives, executors, administrators, and successors.

     20.  GOVERNING LAW.  This Agreement shall be subject to and governed by 
the laws of the State of California.

     21.  AMENDMENT OF AGREEMENT.  No change or modification of this 
Agreement shall be valid unless the same be in writing and signed by me and 
the Company. No waiver of any provision of this Agreement shall be valid 
unless in writing and signed by the person or party to be charged.

     22.  SEVERABILITY.  If any portion or portions of this Agreement shall 
be, for any reason, deemed to be invalid or unenforceable, the remaining 
portion or portions shall nevertheless be valid, enforceable and carried into 
effect, unless to do so would clearly violate the present legal and valid 
intention of the parties hereto.

     23.  BREACH.  In the event I breach this Agreement and the Company 
prevails in an action to enforce the terms of this Agreement, I agree to pay 
to the Company all reasonable attorneys' fees and costs incurred by the 
Company in prosecuting such action, and all damages suffered by the Company 
as well as any gain or profit derived by me as a result of any such breach.

     24.  HEADINGS.  The headings of this Agreement are inserted for 
convenience only and are not to be considered in construction of the 
provisions hereof.

     25.  WAIVER OR BREACH.  The waiver by either of the parties hereto of 
any breach of any provision hereof shall not be construed to be a waiver of 
any succeeding breach of that provision or a waiver of any other provision of 
this Agreement.

     26.  PRIOR AGREEMENTS.  This Agreement supersedes any and all prior 
agreements between the Company and Employee with respect to the subject 
matter hereof, including, but not limited to all Employment Agreements and/or 
Invention and Confidentiality Agreements or any amendment thereto.

                                       8

<PAGE>


     27.  GENERIC DRUG ENFORCEMENT ACT CERTIFICATION.  The undersigned, 
certifies that he or she (1) has never been charged with or convicted of a 
federal felony for conduct relating to the development, approval, or 
regulation of any drug product or device regulated by the United States Food 
and Drug Administration, and (2) has never been debarred or subject to a 
debarment proceeding under the Generic Drug Enforcement Act of 1992.

     WHEREAS, the parties have executed this Agreement as of the date first 
above written.

                                   MOLECULAR BIOSYSTEMS, INC.



                                   By:  /s/ Bobba Venkatadri
                                        -----------------------
                                        Bobba Venkatadri 
                                        Chief Executive Officer



                                   By:  /s/ Joni Harvey
                                        -----------------------
                                        Joni Harvey


                                       9

<PAGE>

                                                                  EXHIBIT 10.42

                                 EMPLOYMENT AGREEMENT

     EMPLOYMENT AGREEMENT dated as of September 1, 1997, between HOWARD C. 
DITTRICH, an individual ("Employee"), and MOLECULAR BIOSYSTEMS, INC., a 
Delaware corporation ("the Company").

     1.   EMPLOYMENT.  The Company hereby employs the Employee as its Vice 
President, Research, Clinical and Medical Affairs, to provide services at 
such times as shall be mutually agreed upon between them.  The Company shall 
be entitled to all of the benefits and profits arising from or incident to 
the work, services and advice rendered by the Employee relating to the work 
performed for the Company.  The Employee shall make all information available 
to the Company that relates to the Company's business of which he has any 
knowledge and shall not use any such information or the benefits of any such 
information for his personal profit or that of any third party.  The Employee 
agrees to use his best efforts to promote the interests of the Company 
including, where appropriate, the publication of articles in medical and 
scientific journals and the participation in medical and scientific seminars 
and symposiums relating to the business and affairs of the Company and/or his 
research efforts performed for and on behalf of the Company.  The Employee 
shall perform the duties of employment in a manner satisfactory to the 
Company and shall, other than as provided in paragraph 11 herein, devote his 
full working time to such duties.

     2.   DISCLOSURES.  I shall promptly disclose in writing to the officials 
designated by the Company to receive such disclosures, complete information 
concerning each and every invention, discovery, improvement, device, design, 
apparatus, practice, process, method or product (hereinafter referred to as 
"Inventions"), whether I consider them patentable or not, made, developed, 
perfected, devised, conceived or reduced to practice by me, either solely or 
in collaboration with others, during the period of my employment by the 
Company, and for a period of twelve (12) months after the termination of my 
employment, whether or not during regular working hours, relating either 
directly or indirectly to the business, products, practices or techniques of 
the Company or to the Company's actual or demonstrably anticipated research 
or development of the Company, or resulting from any work performed by me for 
the Company or with the equipment, property, supplies, facilities or 
confidential information of the Company.

     3.   CONFIDENTIALITY.  I recognize that my employment with the

                                       1

<PAGE>

Company will involve contact with information of substantial value to the 
Company, which is not old and generally known in the trade and which gives 
the Company an advantage over its competitors who do not know or use it, 
including but not limited to techniques, designs, drawings, processes, 
inventions, developments, equipment, prototypes, sales and customer 
information, and business and financial information, relating to the 
business, products, practices or techniques of the Company (hereinafter 
referred to as "Confidential Information").  I shall at all times regard and 
preserve as confidential such Confidential Information obtained by me from 
whatever source and shall not, either during my employment or thereafter, 
publish or disclose any part of such Confidential Information in any manner, 
or use the same except on behalf of the Company, without the prior written 
consent of the Company.  Further, I shall, during my employment and 
thereafter, refrain from any acts or omissions that would reduce the value of 
such Confidential Information to the Company.

     4.   ASSIGNMENT OF RIGHTS.  I hereby agree that any inventions made, 
developed, perfected, devised, conceived or reduced to practice by me during 
the period of my employment by the Company, and any other inventions made, 
developed, perfected devised, conceived or reduced to practice by me during 
said period of twelve (12) months after the termination of my employment if 
based upon the Confidential Information of the Company, relating either 
directly or indirectly to the business, products, practices or techniques of 
the Company, or to the Company's actual or demonstrably anticipated research 
or development of the Company, or resulting from any work performed by me for 
the Company  or with the equipment, supplies, facilities or Confidential 
Information of the Company, are the sole property of the Company, and hereby 
assign and agree to assign to the Company, its successors and assigns, all of 
my right, title and interest in and to said Inventions, and any patent 
applications or Letters Patent thereon.

                                     NOTIFICATION
                                     ____________

     This Agreement does not apply to an invention for which no equipment, 
supplies, facility, or trade secret information of the Company was used and 
which was developed entirely on my own time, and (a) which does not relate 
(1) to the business of the Company or (2) to the Company's actual or 
demonstrably anticipated research or development, or (b) which does not 
result from any work performed by me for the Company, as defined and provided 
by Section 2870 of the California Labor Code.

                                       2

<PAGE>

     5.   COVENANT OF COOPERATION.  I shall, at any time during employment or 
thereafter, but at no expense to me, do all lawful acts, including but not 
limited to the execution of papers and oaths, the giving of testimony, and 
the obtaining of evidence that in the opinion of the Company, its successors 
or assigns, may be necessary or desirable for obtaining, sustaining, 
reissuing or enforcing Letters Patent in the United States and throughout the 
world for said Inventions, and for perfecting, recording or maintaining the 
title of the Company, its successors and assigns, to said Inventions and to 
any patent applications made and any Letters Patent granted for said 
Inventions in the United States and throughout the world.  In the event 
Company requests such cooperation at any time following termination of 
Employee, Company shall provide Employee with reasonable notice of not less 
than ten business days prior to the actions requested of Employee.  In 
addition, Employee shall be entitled to reasonable compensation for any such 
services, unless Employee is, at the time of the request by Company, 
receiving Severance Payments as described in this Agreement, or unless such 
compensation would prove prejudicial to the Company's enforcement of its 
rights under any such Inventions.  As used herein, reasonable compensation 
shall be defined as the rate being paid to Employee by a subsequent employer 
at the time of the request by Company, or if Employee is not employed at the 
time of the request, the rate at which Company was compensating Employee 
prior to his termination, provided, however, in no instance will the rate 
exceed three hundred dollars ($300) per hour.  In the event Employee resides 
more than (fifty) 50 miles from Company's primary business offices, Company 
shall pay for any reasonable travel expenses, including meals and lodging and 
airfare at no higher than the prevailing coach rate.  Arrangements for any 
such further services shall be made in a manner which does not substantially 
interfere with any new employment or enterprise of Employee.

     6.   PATENT ENFORCEMENT.  The Company shall have the sole discretion 
whether to obtain, maintain, modify or enforce any domestic or foreign patent 
for said Inventions assigned to the Company pursuant to this Agreement.  The 
Company is free to enter into any licensing or assignment agreement with any 
third party or to use whatever means it deems best to develop, promote or 
market said Inventions assigned to the Company pursuant to this Agreement or 
any domestic or foreign patent thereof.

     7.   CLAIMS BY THIRD PARTY.  As to any Inventions which were made,
developed, perfected, devised, conceived or reduced to practice by me during the
period of my employment by the Company, and for a period of twelve (12) months
after the termination of my employment, but which are claimed for any

                                       3

<PAGE>

reason to belong to an entity or a person other than the Company and shall 
not disclose the same to others if the Company, within twenty (20) days 
thereafter, shall claim ownership of, or an interest in, such Inventions 
under the terms of this Agreement.  If the Company makes such a claim, I 
agree that any controversy relating to such claim shall be settled and 
determined by binding arbitration conducted in San Diego, California, in 
accordance with the rules of the Judicial Arbitration and Mediation Services 
then existing.  The cost of arbitration shall be shared equally.  In the 
event Employee is notified that a person or entity other than Employee, or a 
company in which Employee has an ownership interest, or a new employer of 
Employee, asserts a claim to such Inventions, Employee's sole responsibility 
shall be to notify Company and otherwise provide cooperation in accordance 
with Paragraph 5 of this Agreement. 

                                       4

<PAGE>

     8.   RECORD KEEPING.  I shall keep complete, accurate and authentic 
accounts, notes, data and records of any and all of said Inventions in the 
manner and form requested by the Company.  Such accounts, notes, data and 
records, including all copies thereof, shall be the property of the Company, 
and upon its request, I will promptly surrender the same to it, or if not 
previously surrendered, I will promptly surrender the same to the Company, 
and all copies thereof, at the conclusion of my employment.

     9.   RECORDS PROPERTY OF COMPANY.  I agree that all accounts, notes, 
data sketches, drawings and other documents and records, and all material and 
physical items of any kind, including all reproductions and copies thereof, 
which relate in any way to the business, products, practices or techniques of 
the Company or contain Confidential Information, made by me or that come into 
my possession by reason of my employment are the property of the Company and 
shall be promptly surrendered to the Company, including any and all copies 
thereof, at the conclusion of my employment.  Notwithstanding the foregoing, 
I shall be entitled to remove any personal property; personal effects and 
materials which I can demonstrate are owned by me.

     10.  INDUCEMENT.  I agree that I shall not disclose to the Company or 
induce the Company to use an invention or confidential information belonging 
to any third party.

     11.  NO OTHER AGREEMENTS.  Employee warrants and represents that, other 
than as provided herein, he has no agreement with any other party that would 
preclude his compliance with his obligations under this Agreement as set 
forth above.  The Company hereby recognizes and approves of Employee's right 
to (1) devote one-half day per week as a practicing cardiologist at UCSD 
Medical Center, and to (2) devote a maximum of four (4) hours per month as 
Medical Advisor to the Lifescreen company, and (3) to such other activities 
approved in advance by the Company.  Employee shall obtain the prior approval 
of Company's CEO and President regarding the scope and timing, including any 
changes thereof, of such extracurricular activities.  Other than as provided 
in this paragraph 11, Employee agrees to fully devote and apply as much of 
his time, skill, experience, training and talents as is necessary in the 
opinion of the Company to satisfy the duties of his employment with the 
Company.

                                       5

<PAGE>


     12.  CHANGE OF CONTROL.  

     a.  DEFINITIONS.  The following definitions shall apply with respect to 
this "Change of Control" section only:

     (1)  AGREEMENT means the agreement governing Employee's employment by MBI
          of which this Change of Control section forms a part and which may be
          referred to as an Employment Agreement or an Invention and
          Confidentiality Agreement or by some similar name.   

     (2)  BASE SALARY means Employee's annual compensation, exclusive of
          bonuses, stock options and other fringe benefits.

     (3)  CHANGE OF CONTROL means an event or the last of a series of related
          events by which:

          (A)  any person or group (as defined in Section 13(d) of the Exchange
               Act) who, together with all affiliates and associates (as defined
               in Rule 12b-2 under the Exchange Act) (an "Acquiring Person)
               becomes the direct or indirect beneficial owner of 25% or more of
               MBI's outstanding stock (or of 25% or more of MBI's outstanding
               voting stock, if and when MBI has more than one class of stock
               outstanding); OR

          (B)  Continuing Directors cease to comprise a majority of the Board of
               Directors.  A Continuing Director is any director who (while a
               director) is not an Acquiring Person or an affiliate or associate
               of an Acquiring Person or a representative thereof and who (A) is
               a director as of the date that the Agreement (containing this
               Change of Control section) is executed by both parties, or (B)
               subsequently becomes a director and whose nomination for election
               by MBI's stockholders (or whose election by the Board, in case of
               a vacancy filled by the Board) was approved by a resolution of a
               majority of the Continuing Directors or who is included as a
               nominee in a proxy statement of MBI when a majority of the Board
               consists of Continuing Directors.

     (4)  CONSTRUCTIVE TERMINATION means a termination of the Agreement by
          Employee within 2 years after a Change of Control, during which 2-year
          period any of the following events take place: (I) a material

                                       6

<PAGE>


          reduction in the total annual compensation package paid to Employee
          immediately prior to the Change of Control; (ii) a relocation (or
          demand for relocation) of Employee's place of employment more than 30
          miles from his current place of employment; or (iii) a significant
          change in the nature or scope of Employee's job responsibilities or
          the imposition of significant limitations on his autonomy in his
          position as an employee of MBI, as compared to the nature, scope and
          degree of autonomy prior to the Change of Control.     

     (5)  EXCHANGE ACT means the Securities Exchange Act of 1934, as amended,
          and the rules and regulations promulgated thereunder.

     (6)  INVOLUNTARY TERMINATION shall be deemed to have taken place if
          Employee dies or if the Employee has a physical or mental condition as
          a result of injury, illness or disease which prevents Employee from
          performing substantially all of his duties or from working on a
          substantially full-time basis, for a period of 24 consecutive weeks or
          28 weeks out of any 52-week period.

     (7)  SEVERANCE PAYMENTS is defined in subsection (b) below.

     (8)  TERMINATION FOR CAUSE means a termination of the Agreement by MBI
          because of any of the following conduct engaged in by Employee: (I)
          the commission of a felony or a crime involving moral turpitude or the
          commission of an act involving dishonesty or fraud with respect to MBI
          or its affiliates, if any; (ii) conduct tending to bring MBI or its
          affiliates, if any, into substantial public disgrace or disrepute; or
          (iii) substantial and repeated failure to perform duties as reasonably
          directed by the Board of Directors or President of MBI or its
          affiliates, if any.

     (9)  TERMINATION WITHOUT CAUSE means any termination of the Agreement by
          MBI, other than a Termination for Cause or an Involuntary Termination.

     b.  SEVERANCE PAYMENTS AND OTHER BENEFITS IN THE EVENT OF TERMINATION.  
In the event of the termination of the Agreement a result of (I) a 
Termination Without Cause within 2 years following a Change of Control or 
(ii) a Constructive Termination, MBI shall provide the payments and other 
benefits specified below to Employee, in lieu of any other payments or 
benefits which may (or may not) be provided for elsewhere in the Agreement.

                                       7

<PAGE>

     (1) MBI shall make the following payments to Employee (or to his estate):

          (a)  ACCRUED SALARY.  MBI shall pay Employee's Base Salary through the
          effective date of termination of the Agreement.

                                       8

<PAGE>


     (b) SEVERANCE PAYMENTS.   MBI shall pay an amount equal to 1.5 times (A)
          the Base Salary in effect immediately prior to the Change of Control
          and (B) the higher of (x) 100% of Employee's target bonus as
          determined under MBI's incentive compensation plan or (y) an average
          of the three most recent bonuses awarded to Employee (collectively,
          referred to as "Severance Payments"). 

          (c) MANNER OF PAYMENT.  Severance Payments shall be paid over an 
          18-month period in approximately equal consecutive monthly 
          installments, with the first payment to be made no later than 30
          days following the effective date of termination of the Agreement
          and the balance payable on the first day of each month beginning
          with the second month following the month in which the effective
          date of termination occurs. 

          (d) ABSOLUTE RIGHT TO SEVERANCE PAYMENTS.  Employee's right to
          Severance Payments shall not be conditioned upon compliance with any
          non-competition or confidentiality provisions which may (or may not)
          exist elsewhere in the Agreement.

     (2)  MBI shall provide the following benefits to Employee:

          (1) COBRA BENEFITS.   MBI shall provide COBRA continuation coverage to
          Employee under its medical, dental and vision insurance plans and
          shall assume the cost of continuation coverage provided to Employee
          (but not to his family).  In the event that Employee maintains family
          coverage under any of the aforementioned plans or policies, Employee
          shall be responsible for payment of the difference in cost between
          individual coverage and family coverage, which amount may be deducted
          by MBI from the Change of Control Severance Payments.  In the event
          that Change of Control Severance Payments have ceased, Employee shall
          reimburse MBI for the difference in cost between individual coverage
          and family coverage by the first day of each month that continuation
          coverage benefits are provided.  

          (2) OUTPLACEMENT SERVICES.  MBI will make available to Employee, upon
          his request, outplacement services provided by a reputable
          outplacement counselor selected by MBI for a period of 6 months
          following his termination.  MBI will assume the cost of all such
          outplacement services.

                                       9

<PAGE>

     c.  ACCELERATION OF STOCK OPTIONS IN THE EVENT OF A CHANGE OF CONTROL.  
In the event of a Change of Control (whether or not followed by termination 
of the Agreement), all stock options under any MBI stock option plan which 
Employee holds at the time of such Change of Control shall become fully 
"vested" (I.E., immediately exercisable).

     d.  LIMITATIONS.  The Change of Control Severance Payments shall be 
reduced as necessary so that the present value, as determined in accordance 
with Section 280G(d)(4) of the Internal Revenue Code, of the sum of (I) the 
Change of Control Severance Payments and (ii) all other payments, if any, 
that must be taken into account for purposes of the computation under Section 
280G(b)(2)(A)(ii) of the Internal Revenue Code in respect of Employee does 
not exceed 2.99 times Employee's base amount, as "base amount" is defined in  
Section 280G(b)(3) of the Internal Revenue Code. 

     13.  EXPENSES.  The Company shall pay or reimburse the Employee for 
expenses incurred by him on behalf of the Company with its approval.  Such 
reimbursement shall be made upon presentation by the Employee to the Company 
of itemized accounts or receipts satisfactory to the Company.  The Employee's 
obligations with respect to his performance hereunder are unconditional and 
are not dependent upon such reimbursement.  The Company reserves the right to 
charge back to the Employee any expense reimbursement found to be non-tax 
deductible by the Company or found to have been falsely or improperly claimed 
by him.

     14.  PROHIBITION AGAINST ASSIGNMENT.  I agree that this Agreement and 
the rights, interests and benefits hereunder shall not be assigned, 
transferred, pledged or hypothecated in any way by me or any executor, 
administrator, heir, legatee, distributee or any other person claiming under 
me by virtue of this Agreement and shall not be subject to execution, 
attachment or similar process. Any attempt to assign, transfer, pledge or 
hypothecate or otherwise dispose of this Agreement or of such rights, 
interests and benefits contrary to the foregoing provisions, or the levy of 
any attachment or similar process thereon shall be null and void and without 
effect and shall relieve the Company of any and all liability hereunder.

     15.  NOTICE.  Any and all notices, designations, consents, offers, 
acceptances or any other communication provided for herein shall be given in 
writing by registered or certified mail, return receipt requested, which 
shall be addressed, in the case of the Company, to its office in San Diego, 
California, attention: General Counsel, and in my case to my last known place 
of residence as reflected on the Company's records.

                                       10

<PAGE>

     16.  ENTIRE AGREEMENT.  This Agreement constitutes the entire agreement 
between me and the Company and contains all of the agreements between us with 
respect to the subject matter hereof.

     17.  BINDING EFFECT.  This Agreement shall be binding upon and inure to 
the benefit of me and the Company and our respective heirs, legal 
representatives, executors, administrators, and successors.

     18.  GOVERNING LAW.  This Agreement shall be subject to and governed by 
the laws of the State of California.

     19.  AMENDMENT OF AGREEMENT.  No change or modification of this 
Agreement shall be valid unless the same be in writing and signed by me and 
the Company. No waiver of any provision of this Agreement shall be valid 
unless in writing and signed by the person or party to be charged.

     20.  SEVERABILITY.  If any portion or portions of this Agreement shall 
be, for any reason, deemed to be invalid or unenforceable, the remaining 
portion or portions shall nevertheless be valid, enforceable and carried into 
effect, unless to do so would clearly violate the present legal and valid 
intention of the parties hereto.

     21.  BREACH.  In the event of any controversy, claim, or dispute between 
the parties hereto, arising out of or relating to this Agreement or breach 
thereof, the prevailing party shall be entitled to recover from the losing 
party, reasonable expenses, attorney's fees and costs.

     22.  HEADINGS.  The headings of this Agreement are inserted for 
convenience only and are not to be considered in construction of the 
provisions hereof.

     23.  WAIVER OR BREACH.  The waiver by either of the parties hereto of 
any breach of any provision hereof shall not be construed to be a waiver of 
any succeeding breach of that provision or a waiver of any other provision of 
this Agreement.

     24.  SEVERANCE.  In the event Employee is involuntarily terminated for
reasons other than for cause, Employee shall receive as severance, payable in
bi-weekly installments, six months' salary at the then current rate.  This
paragraph shall not be applicable if Employee's termination is as a result of a
Change in Control as described in Paragraph 12.

                                       11

<PAGE>

     25.  PRIOR AGREEMENTS.  This Agreement supersedes any and all prior 
agreements between the Company and Employee with respect to the subject 
matter hereof, including, but not limited to all Employment Agreements and/or 
Invention and Confidentiality Agreements or any amendment thereto.

     26.  GENERIC DRUG ENFORCEMENT ACT CERTIFICATION.  The undersigned, 
certifies that he or she (1) has never been charged with or convicted of a 
federal felony for conduct relating to the development, approval, or 
regulation of any drug product or device regulated by the United States Food 
and Drug Administration, and (2) has never been debarred or subject to a 
debarment proceeding under the Generic Drug Enforcement Act of 1992.

     WHEREAS, the parties have executed this Agreement as of the date first 
above written.

                                   MOLECULAR BIOSYSTEMS, INC.



                                   By:  /s/Bobba Venkatadri
                                        -------------------
                                        Bobba Venkatadri 
                                        President  and Chief Executive 
                                             Officer


                                   By:  /s/Howard C. Dittrich
                                        -------------------
                                        Howard C. Dittrich  



                                       12

<PAGE>

                                                                 Exhibit 10.43
                                          
                                          
                                          
                                    May 30, 1997
                                          
                                          


Mr. Allan H. Mizoguchi, Ph.D.
Vice President, Clinical & Quality
Molecular Biosystems, Inc.
10030 Barnes Canyon Road
San Diego, California  92121

          Re:  Terms of Separation from MBI
               ----------------------------

Dear Al:

     In accordance with our recent discussions, this letter ("Letter 
Agreement") will set forth the terms of our agreement regarding your 
voluntary departure from MBI.

     1.   DESCRIPTION.  Both parties shall regard your departure as a 
voluntary resignation to pursue personal goals and other opportunities.

     2.   TIMING.  You shall resign as an employee and officer of MBI 
effective as of May 30, 1997 ("Resignation Date").  Your resignation shall be 
in the form attached hereto.

     3.   EFFECTIVE DATE.  This Letter Agreement shall become effective on 
the eighth day following your execution of the agreement, unless you have 
revoked acceptance during the seven days prior thereto.  (SEE Paragraph 
15(b).) Regardless of when this takes place, the Agreement shall be deemed to 
have been in effect retroactive to May 30, 1997.  The Agreement shall not 
become effective unless executed by you and MBI.

     4.   SEPARATION PAYMENTS.  In consideration of your undertakings in this 
Agreement, MBI shall provide you with severance benefits equivalent to one 
year current salary.  This amount shall be paid to you in bi-weekly 
installments for the one year period following your Resignation Date (last 
payment May 29, 1998). Taxes and other appropriate deductions will be 
withheld, however, contributions to your 401(k) or any other benefit 
deductions will not be allowed.

     5.   WELFARE BENEFITS.  Regular medical, dental, vision, as well as 
basic and optional life and accidental death and dismemberment insurance will 
continue through May 31, 1997.  Long-Term disability coverage will continue 
through the Resignation Date and end thereafter.  In addition:

          (a)  Medical, dental, and vision insurance under MBI's policies for 
you and currently insured dependents will be extended through COBRA from June 
1, 1997 through May 31, 1998 (unless you obtain other coverage during that 
time, in which you must notify MBI) at MBI's expense. Thereafter, you may 
elect to continue COBRA coverage at your expense for an additional six 
months.  (Maximum COBRA coverage is 18 months.) 

          (b)  You will be provided the information needed to request the 
option of converting the group life insurance and/or accidental death and 
dismemberment insurance coverage to an individual 


                                       

<PAGE>

Mr. Allan H. Mizoguchi, Ph.D.
May 30, 1997
Page 2

policy.  You will work directly with CIGNA should you elect this option.  You 
would need to exercise this option within 31 days of the benefits termination 
date, May 31, 1997.

                                       

<PAGE>

Mr. Allan H. Mizoguchi, Ph.D.
May 30, 1997
Page 3

          (c)  You will be provided the information needed to request the 
option of converting the Long Term disability (LTD) insurance coverage to an 
individual policy.  You should work directly with UNUM should you elect this 
option.  You would need to exercise this option within 31 days of your 
resignation date, May 30, 1997.

          (d)  Depending on the amount of your 401(k) plan balance, you may 
either elect to remain in the plan with no further deposits (balance greater 
than $3500), or elect a distribution of your funds (balance less than $3500). 
You will notify CIGNA within 30 days of the Resignation Date as to how and to 
whom your funds should be distributed. Information on how to initiate your 
desired option will be provided by Human Resources.

          (e)  If you are a participant in the health care reimbursement 
plan, you will have until the end of 1997 to request reimbursement for 
charges incurred through the Resignation Date.  Any such request should be 
made directly to UNUM.

          (f)  You will be paid for all earned and unused vacation hours.  
You will not accrue any additional vacation following the Resignation Date.

Representatives of Human Resources will be available to explain details of 
the above items. 

     6.   STOCK OPTIONS.

          (a)  CURRENT OPTIONS.  You have been granted stock options as 
described in the attached schedule.  As of May 30, 1997 MBI will accelerate 
the vesting of all unvested options.  MBI will also extend the period of 
exercisability of those options to the maximum period available under our 
plans. (That is, the lapse dates in the charts, which are ALREADY at the 
maximum, will not be reduced on account of your ceasing to be an employee.)

          (b)  RESTRICTIONS AND TRANSACTIONS.  Until November 30, 1997 
("Reporting Period"), you will be under the same constraints imposed by MBI 
and securities laws on MBI vice presidents regarding the exercise of options 
and the purchase and sale of MBI shares.  During the Reporting Period, you 
shall notify us of your intentions in this regard (including option 
exercises) and shall execute such forms, if any, as MBI and the U.S. 
securities laws require.  If you wish, you may use the services of MBI's 
Finance department to assist you in exercising your options and selling your 
shares (if that is how you choose to proceed) during the Reporting Period.  
You acknowledge that taxes and commissions will be withheld from any profit 
you make on the sale of the stock following exercise and sale during the 
Reporting Period.  During the Reporting Period, you will be notified monthly, 
along with other MBI Section 16(b) reporting persons, as to the current 
trading status of MBI stock (i.e., "green light," "yellow light," or "red 
light").  At no time -- presently, or at any future time, during or after the 
Reporting Period -- may you trade on inside MBI information.

     7.   PLACEMENT.  MBI will provide you with six months outplacement 
counseling and services through Right Management Consultants.  In addition, 
MBI will also allow you to continue to use the company's phone voicemail 
system and your current voice mailbox for a period of three months following 
your Resignation Date.
                                       

<PAGE>

Mr. Allan H. Mizoguchi, Ph.D.
May 30, 1997
Page 4

     8.   COOPERATION;  NO RAIDING; NON-DISPARAGEMENT.  You shall cooperate 
with MBI in any and all governmental and/or third-party proceedings, 
including but not limited to lawsuits and other disputes.  Following your 
resignation such cooperation shall be at MBI's expense (except that MBI 
cannot pay for the content of sworn testimony).  You shall keep MBI advised 
of contacts by governmental agencies and third parties, and shall reasonably 
cooperate with MBI in handling any response.  At your request, MBI shall 
provide counsel to you, if the parties deem counsel necessary or desirable, 
in any such proceeding.  You shall not voluntarily cooperate with, testify 
for, or otherwise assist parties adverse to MBI in a dispute, although you 
may respond to compulsory process (i.e., a valid subpoena).  

     For a period of one year following the Resignation Date, you shall not 
contact persons employed by MBI at the time to recruit them for your business 
or any business by which you are employed or with which you are affiliated, 
or otherwise encourage them to leave MBI.

     You shall not materially disparage MBI, and MBI shall not materially 
disparage you, to any third parties.

     9.   CONTACTS BY POTENTIAL EMPLOYERS.  Potential employers contacting 
MBI will be told only that your resignation was voluntary; your title; your 
dates of employment; and your final salary.  MBI will provide you with a 
positive letter of reference.  The letter will be agreed upon between you and 
me.

     10.   CONFIDENTIALITY.  You will not remove any MBI information, 
documents, or other property from its premises, and you will return any MBI 
information currently in your possession or control off MBI's premises.  In 
addition:

          (a)  You acknowledge that in the course of your employment with MBI 
you have had and will have access to and familiarity with information of 
substantial value to MBI which is not old or generally known to the public 
and which gives MBI an advantage over its competitors who do not know or use 
it, including but not limited to strategies, business plans, research, 
formulas and formulations, techniques, designs, drawings, processes, 
inventions, developments, equipment, prototypes, sales and customer 
information, and financial information, relating to the business, products, 
and practices of MBI (hereinafter referred to as "Confidential Information"). 
 You agree at all times following your resignation to regard and preserve as 
confidential such Confidential Information, and to refrain from publishing or 
disclosing any part of such Confidential Information and from using it except 
on behalf of MBI.  You further agree at all times to refrain from any other 
acts or omissions that would reduce the value of such Confidential 
Information to MBI and to take all reasonably necessary and desirable 
precautions to prevent such Confidential Information from being disseminated 
to any third parties.

          (b)  You acknowledge that a breach of the terms of this paragraph 
would threaten MBI with immediate and irreparable harm not readily 
compensable in money damages, and that MBI would be entitled to injunctive 
and declaratory relief to stop or prevent any such breach.

Nothing in this paragraph shall be construed to prevent you from using or 
disclosing your general knowledge of the imaging industry (as opposed to 
MBI-specific information) acquired at any time prior to or during the course 
of your employment.

                                       

<PAGE>

Mr. Allan H. Mizoguchi, Ph.D.
May 30, 1997
Page 5


     11.  EMPLOYMENT BY COMPETITORS.  This Letter Agreement does not limit 
your ability to work for competitors of MBI, PROVIDED THAT for a period of 
one year from the Resignation Date, reasonably in advance of accepting any 
employment with any of the companies listed below ("Competitor"), you shall 
notify the President and Chief Executive Officer of MBI.  

    Abbott Laboratories                ImaRx Pharmaceutical
    Accusphere                         Interactive Medical
    Alliance Pharmaceuticals           Technologies
    Berlex Imaging                     Medisperse
    Bracco                             Nycomed
    Delta Biotechnology                Schering
    DuPont/Merck                       Sonus Pharmaceuticals


<PAGE>

Mr. Allan H. Mizoguchi, Ph.D.
May 30, 1997
Page 6

Prior to accepting any such employment, or promptly following your engagement 
in any consulting relationship with a Competitor, you shall give MBI the 
opportunity to discuss your plans with you in order to explore any possible 
problems or conflicts.  While MBI shall not disparage you or attempt to 
dissuade any Competitor from employing or engaging you, you acknowledge that 
MBI may contact such Competitor informing it truthfully of your 
confidentiality obligations to MBI.  MBI shall have no liability to you in 
the event of a decision by a Competitor not to employ or engage you following 
such contact by MBI.  Failure to provide this notice to MBI during this 
period shall be deemed a material breach of this Agreement.

     You remain bound by your confidentiality obligations even if you work 
for a Competitor.

     12.  RELEASE.  In consideration for the payments, options, and other 
consideration described in this Letter Agreement, you hereby unconditionally, 
irrevocably, and absolutely release and discharge MBI, its employees, 
officers, directors, agents, stockholders, independent contractors, 
attorneys, consultants, predecessors, successors and assigns from any and all 
claims related in any way to any acts, transactions, or occurrences between 
you and MBI to date, including but not limited to all losses, liabilities, 
claims, charges, demands and causes of action, known or unknown, suspected or 
unsuspected, arising directly or indirectly out of, or in any way connected 
with, your employment with or resignation from MBI.  This includes, but is 
not limited to, any claim of employment discrimination arising under federal, 
state or local law, including the Age Discrimination in Employment Act of 
1967, as amended, the Americans with Disabilities Act, the California Fair 
Employment and Housing Act, any other statutory cause of action, and any tort 
or contract claims.

     WAIVER OF ADDITIONAL CLAIMS.  Section 1542 of the Civil Code of the 
State of California provides as follows:

     A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT 
KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE RELEASE, 
WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED HIS SETTLEMENT WITH THE 
DEBTOR.

You waive and relinquish any right or benefit which you may have under this 
section or any other provision of the statutory or nonstatutory law or any 
other jurisdiction to the full extent that you may lawfully waive all such 
rights and benefits.  In connection with such waiver and relinquishment, you 
acknowledge that you are aware that you, your attorneys or agents may 
hereafter discover claims or facts in addition to or different from those 
which they now know or believe to exist, but that it is your intention 
thereby fully, finally, and forever to release all claims, disputes, and 
differences, known or unknown, suspected or unsuspected, which now exist, may 
exist, or have existed between the parties, their employees, agents, assigns, 
and other privies.  Unless this provision shall have been procured by fraud, 
the releases given herein shall be effective regardless of the discovery or 
existence of any such claim or fact.

     13.  CONSEQUENCES OF BREACH.  If you breach this Letter Agreement, MBI 
may terminate it, cease providing payments and benefits hereunder, cancel 
your stock options, and recover all payments and benefits already paid, in 
addition to any other remedies it may have.

     14.  OTHER MATTERS.  You will receive materials prepared by Human 
Resources describing various rights and duties, including optional benefits, 
which will come into effect following your resignation.  You will also 
receive instruments as are customarily submitted to resigning employees.  You 
will cooperate fully in these separation meetings and execute or complete 
such instruments at the time of your resignation.

     15.  ACKNOWLEDGMENTS.  

                                       

<PAGE>

Mr. Allan H. Mizoguchi, Ph.D.
May 30, 1997
Page 7

          (a)  NO PRE-EXISTING OBLIGATION.  You acknowledge that but for the 
entry by you and MBI into this Letter Agreement, you are not entitled to the 
payments, stock options, and other consideration provided for in these 
agreements (with the exception of federal rights such as COBRA).

          (b)  TIME FOR REVIEW; EFFECTIVE DATE.  You acknowledge that you 
have been given 21 days to consider the terms of this Letter Agreement.  In 
addition, both parties acknowledge that you may revoke your acceptance of 
this Letter Agreement within seven days following your signature (which may 
occur during the 21-day period).  

          (c)  ADVICE OF COUNSEL AND OTHER PROFESSIONAL ADVISORS.  You 
acknowledge that you have been advised in writing to consult with an attorney 
and an accountant or tax advisor before entering into these agreements.  You 
acknowledge either that you have done so and received counseling to your 
satisfaction, or that you have declined to do so and voluntarily executed 
this Letter Agreement without fraud or undue influence.

     16.  PROHIBITION AGAINST ASSIGNMENT.  You shall not assign this Letter 
Agreement or any of the rights, interests and benefits hereunder.  However, 
you may provide for the assignment, gift, bequest, or transfer of such 
benefits under this Letter Agreement to your survivor(s), or to a trust for 
their benefit, on your death, or in the event that you suffer a major 
disability. 

     17.  ENTIRE AGREEMENT.  This Letter Agreement between the parties dated 
May 30, 1997, constitutes the entire Agreement between the parties hereto and 
contains all of the agreements between the parties with respect to its 
subject matter.  This Letter Agreement supersedes any and all other 
agreements, either oral or in writing, between the parties hereto with 
respect to their subject matter, PROVIDED THAT Paragraphs 3 (Confidentiality) 
and 4-9 (relating to inventions made within a year of termination) of your 
Employment Agreement dated August 1, 1994, shall remain in effect.

     18.  BINDING EFFECT.  This Letter Agreement shall be binding upon and 
inure to the benefit of both parties and their respective heirs, legal 
representatives, executors, administrators, and successors.

     19.  GOVERNING LAW.  This Letter Agreement shall be subject to and 
governed by the laws of the State of California irrespective of the fact that 
you may become a resident of a different state.

     20.  AMENDMENT OF LETTER AGREEMENT.  No change or modification of this 
Letter Agreement shall be valid unless the same be in writing and signed by 
both parties.  No waiver of any provision of this Letter Agreement shall be 
valid unless in writing and signed by the person or party to be charged.

     21.  SEVERABILITY.  If any portion or portions of this Letter Agreement 
shall be, for any reason, deemed to be invalid or unenforceable, the 
remaining portion or portions shall nevertheless be valid, enforceable and 
carried into effect, unless to do so would clearly violate the present legal 
and valid intention of the parties hereto.

     22.  HEADINGS.  The headings of this Letter Agreement are inserted for 
convenience only and are not to be considered in construction of the 
provisions hereof.

                                       

<PAGE>

Mr. Allan H. Mizoguchi, Ph.D.
May 30, 1997
Page 8

     23.  WAIVER OF BREACH.  The waiver by  either of the parties hereto of 
any breach of any provision hereof shall not be construed to be a waiver of 
any succeeding breach of that provision or a waiver of any other provision of 
this Letter Agreement.

     24.  INDEMNIFICATION.  With respect to any claim against you arising out 
of your work for MBI as an officer or employee, you shall have rights of 
indemnification against MBI under MBI's certificate of incorporation and 
bylaws equivalent to those of an MBI officer.

                                      * * * *

     If you are in agreement with these items, please execute the duplicate 
originals of this Letter Agreement and return them to Pam Alexandra.

     Let me take this opportunity to thank you for your services to MBI over 
the past several years.  We all wish you every success in your future 
endeavors.

                              Sincerely,


                              /s/ Bobba Venkatadri
                              -------------------------
                              Bobba Venkatadri
                              President and Chief Executive Officer


AGREED TO BY:


/s/ Allan H. Mizoguchi
- --------------------------
Allan H. Mizoguchi

Date:  June 3, 1997


<PAGE>

                                                                  EXHIBIT 10.44

                                    May 30, 1997


Mr. James L. Barnhart, Ph.D.
Vice President, Research and Development
Molecular Biosystems, Inc.
10030 Barnes Canyon Road
San Diego, California  92121

          Re:  TERMS OF SEPARATION FROM MBI

Dear Jim:

     In accordance with our recent discussions, this letter ("Letter 
Agreement") will set forth the terms of our agreement regarding your 
voluntary departure from MBI.

     1.   DESCRIPTION.  Both parties shall regard your departure as a 
voluntary resignation to pursue personal goals and other opportunities.

     2.   TIMING.  You shall resign as an employee and officer of MBI 
effective as of May 30, 1997 ("Resignation Date").  Your resignation shall be 
in the form attached hereto.

     3.   EFFECTIVE DATE.  This Letter Agreement shall become effective on 
the eighth day following your execution of the agreement, unless you have 
revoked acceptance during the seven days prior thereto.  (SEE Paragraph 
16(b).) Regardless of when this takes place, the Agreement shall be deemed to 
have been in effect retroactive to May 30, 1997.  The Agreement shall not 
become effective unless executed by you and MBI.

     4.   SEPARATION PAYMENTS.  In consideration of your undertakings in this 
Agreement, MBI shall provide you with severance benefits equivalent to one 
year current salary.  This amount shall be paid to you in bi-weekly 
installments for the one year period following your Resignation Date (last 
payment May 29, 1998). Taxes and other appropriate deductions will be 
withheld, however, contributions to your 401(k), health care reimbursement 
account, or any other benefit deductions will not be allowed.

     5.   WELFARE BENEFITS.  Regular medical, dental, vision, as well as 
basic and optional life and accidental death and dismemberment insurance will 
continue through May 31, 1997.  Long-Term disability coverage will continue 
through the Resignation Date and end thereafter.  In addition:

          (a)  Medical, dental, and vision insurance under MBI's policies for 
you and currently insured dependents will be extended through COBRA from June 
1, 1997 through May 31, 1998 (unless you obtain other coverage during that 
time, in which you must notify MBI) at MBI's expense. Thereafter, you may 
elect to continue COBRA coverage at your expense for an additional six 
months.  (Maximum COBRA coverage is 18 months.) 

          (b)  You will be provided the information needed to request the 
option of converting the group life insurance and/or accidental death and 
dismemberment insurance coverage to an individual policy.  You will work 
directly with CIGNA should you elect this option.  You would need to exercise 
this option within 31 days of the benefits termination date, May 31, 1997.

<PAGE>

Mr. James L. Barnhart, Ph.D.
May 30, 1997
Page 2


          (c)  You will be provided the information needed to request the 
option of converting the Long Term disability (LTD) insurance coverage to an 
individual policy.  You should work directly with UNUM should you elect this 
option.  You would need to exercise this option within 31 days of your 
resignation date, May 30, 1997.

          (d)  Depending on the amount of your 401(k) plan balance, you may 
either elect to remain in the plan with no further deposits (balance greater 
than $3500), or elect a distribution of your funds (balance less than $3500). 
You will notify CIGNA within 30 days of the Resignation Date as to how and to 
whom your funds should be distributed. Information on how to initiate your 
desired option will be provided by Human Resources.

          (e)  You currently have an outstanding loan against your 401K 
account (Approximate remaining balance of loan is $11,068.04.)  According to 
MBI's 401(k) Plan, you will be responsible for paying the loan balance in 
full within 30 days of your Resignation Date. Repayment of the loan should be 
in the form of a cashier's check made payable to MBI.  If you do not pay back 
the loan balance, it will be considered a cash distribution and taxed 
accordingly.  For more information on tax consequences of a distribution or 
how to process your loan repayment you may contact CIGNA directly. 

          (f)  If you are a participant in the health care reimbursement 
plan, you will have until the end of 1997 to request reimbursement for 
charges incurred through the Resignation Date.  Any such request should be 
made directly to UNUM.

          (g)  You will be paid for all earned and unused vacation hours.  
You will not accrue any additional vacation following the Resignation Date.

          (h)  As agreed, MBI will pay all your expenses, according to 
policy, to attend the Bio 97' meeting in Houston, Texas in June 1997.

Representatives of Human Resources will be available to explain details of the
above items. 

     6.   STOCK OPTIONS.

          (a)  CURRENT OPTIONS.  You have been granted stock options as 
described in the attached schedule.  As of May 30, 1997 MBI will accelerate 
the vesting of all unvested options.  MBI will also extend the period of 
exercisability of those options to the maximum period available under our 
plans. (That is, the lapse dates in the charts, which are ALREADY at the 
maximum, will not be reduced on account of your ceasing to be an employee.)

          (b)  RESTRICTIONS AND TRANSACTIONS.  Until November 30, 1997 
("Reporting Period"), you will be under the same constraints imposed by MBI 
and securities laws on MBI vice presidents regarding the exercise of options 
and the purchase and sale of MBI shares.  During the Reporting Period, you 
shall notify us of your intentions in this regard (including option 
exercises) and shall execute such forms, if any, as MBI and the U.S. 
securities laws require.  If you wish, you may use the services of MBI's 
Finance department to assist you in exercising your options and selling your 
shares (if that is how you choose to proceed) during the Reporting Period.  
You acknowledge that taxes and commissions will be withheld from any profit 
you make on the sale of the stock following exercise and sale during the 
Reporting Period.  During the Reporting Period, you will be notified monthly, 
along with other MBI Section 16(b) reporting persons, as to the current 
trading status of MBI stock (i.e., "green light," "yellow light," or

<PAGE>

Mr. James L. Barnhart, Ph.D.
May 30, 1997
Page 3


"red light").  At no time -- presently, or at any future time, during or 
after the Reporting Period -- may you trade on inside MBI information.

     7.   PLACEMENT.  MBI will provide you with six months outplacement 
counseling and services through Right Management Consultants.  In addition, 
MBI will also allow you to continue to use the company's phone voicemail 
system and your current voice mailbox for a period of three months following 
your Resignation Date.

     8.   COOPERATION;  NO RAIDING; NON-DISPARAGEMENT.  You shall cooperate 
with MBI in any and all governmental and/or third-party proceedings, 
including but not limited to lawsuits and other disputes.  Following your 
resignation such cooperation shall be at MBI's expense (except that MBI 
cannot pay for the content of sworn testimony).  You shall keep MBI advised 
of contacts by governmental agencies and third parties, and shall reasonably 
cooperate with MBI in handling any response.  At your request, MBI shall 
provide counsel to you, if the parties deem counsel necessary or desirable, 
in any such proceeding.  You shall not voluntarily cooperate with, testify 
for, or otherwise assist parties adverse to MBI in a dispute, although you 
may respond to compulsory process (i.e., a valid subpoena).  

     For a period of one year following the Resignation Date, you shall not 
contact persons employed by MBI at the time to recruit them for your business 
or any business by which you are employed or with which you are affiliated, 
or otherwise encourage them to leave MBI.

     You shall not materially disparage MBI, and MBI shall not materially 
disparage you, to any third parties.

     9.   CONTACTS BY POTENTIAL EMPLOYERS.  Potential employers contacting 
MBI will be told only that your resignation was voluntary; your title; your 
dates of employment; and your final salary.  MBI will provide you with a 
positive letter of reference.  The letter will be agreed upon between you and 
me.

     10   CONFIDENTIALITY.  You will not remove any MBI information, 
documents, or other property from its premises, and you will return any MBI 
information currently in your possession or control off MBI's premises.  In 
addition:

          (a)  You acknowledge that in the course of your employment with MBI 
you have had and will have access to and familiarity with information of 
substantial value to MBI which is not old or generally known to the public 
and which gives MBI an advantage over its competitors who do not know or use 
it, including but not limited to strategies, business plans, research, 
formulas and formulations, techniques, designs, drawings, processes, 
inventions, developments, equipment, prototypes, sales and customer 
information, and financial information, relating to the business, products, 
and practices of MBI (hereinafter referred to as "Confidential Information"). 
 You agree at all times following your resignation to regard and preserve as 
confidential such Confidential Information, and to refrain from publishing or 
disclosing any part of such Confidential Information and from using it except 
on behalf of MBI.  You further agree at all times to refrain from any other 
acts or omissions that would reduce the value of such Confidential 
Information to MBI and to take all reasonably necessary and desirable 
precautions to prevent such Confidential Information from being disseminated 
to any third parties.

          (b)  You acknowledge that a breach of the terms of this paragraph 
would threaten MBI with immediate and irreparable harm not readily 
compensable in money damages, and that MBI would be entitled to injunctive 
and declaratory relief to stop or prevent any such breach.

<PAGE>

Mr. James L. Barnhart, Ph.D.
May 30, 1997
Page 4

Nothing in this paragraph shall be construed to prevent you from using or 
disclosing your general knowledge of the imaging industry (as opposed to 
MBI-specific information) acquired at any time prior to or during the course 
of your employment.

     11.  EMPLOYMENT BY COMPETITORS.  This Letter Agreement does not limit 
your ability to work for competitors of MBI, PROVIDED THAT for a period of 
one year from the Resignation Date, reasonably in advance of accepting any 
employment with any company, individual, or other entity engaged or planning 
to engage in the development, manufacture, or marketing of ultrasound 
contrast agents ("Competitor"), you shall notify the President or Chief 
Executive Officer of MBI.  Prior to accepting any such employment, or 
promptly following your engagement in any consulting relationship with a 
Competitor, you shall give MBI the opportunity to discuss your plans with you 
in order to explore any possible problems or conflicts.  While MBI shall not 
disparage you or attempt to dissuade any Competitor from employing or 
engaging you, you acknowledge that MBI may contact such Competitor, with 
proper advance notice to you, informing it truthfully of your confidentiality 
obligations to MBI.  MBI shall have no liability to you in the event of a 
decision by a Competitor not to employ or engage you following such contact 
by MBI.  Failure to provide this notice to MBI during this period shall be 
deemed a material breach of this Agreement.

     You remain bound by your confidentiality obligations even if you work 
for a Competitor.

     12.  LOAN.  You executed a Note in favor of MBI in the principal amount 
of $205,868 and it is due and payable on January 31, 1998.  The loan is 
secured by 14,000 shares of MBI stock (certificate numbers MB2246 (5,000 
shares) and MB1618 (9,000 shares; ("the Subject Shares")) purchased with the 
loan proceeds as a result of the exercise of a stock option.  With interest, 
the indebtedness evidenced by the Note has risen to approximately $255,102 at 
March 31, 1997. The indebtedness evidenced by the Note, as amended, has been 
retired as of March 31, 1997 as follows:  MBI purchased the Subject Shares 
from you effective March 31, 1997 at the closing price of MBI common stock on 
the New York Stock Exchange as of March 31, 1997 ($9.125 per share).  The 
purchase proceeds were used to reduce the Note.  (Cash did not change hands; 
this was handled by bookkeeping entries.)  MBI forgave the remaining 
indebtedness and the Note was canceled.

     EXAMPLE:

<TABLE>
<CAPTION>
          <S>                      <C>
          Indebtedness:            $255,102

          Purchase price:          $  9.125

          Times 14,000 shares     ($127,750)

          Remaining debt           $127,352

</TABLE>

     MBI forgave the remaining indebtedness of $127,352.

     MBI believes, BUT DOES NOT WARRANT, REPRESENT, OR PROMISE, (1) that the 
debt forgiveness will not result in current taxable income to you, but will 
instead serve to reduce your basis in the shares for purposes of your tax 
accounting, and (2) under the circumstances of your option exercise and the 
forgiveness.  The sale back of stock to MBI will leave you with a tax gain 
which will be subject to tax liability.  In order to compensate you for any 
additional tax liabilities owed as a result of this Loan forgiveness, MBI 
will pay you a lump sum payment of $10,000, from which taxes will be 
deducted.  MBI will not include the forgiveness on your W-2.  MBI STRONGLY 
RECOMMENDS THAT YOU SECURE

<PAGE>

Mr. James L. Barnhart, Ph.D.
May 30, 1997
Page 5


COMPETENT TAX ADVICE WITH RESPECT TO THE ACCOUNTING AND TAX TREATMENT OF THE 
DESCRIBED TRANSACTION PRIOR TO EXECUTING THIS LETTER AGREEMENT.  Additional 
information with respect to your loan:


<TABLE>
<CAPTION>



                                             OPTION              OPTION
          <S>                                <C>                 <C>

          Option price:                      9,000 @ $11.875     5,000 @ $15.75
          Market price on exercise date      $17.50 (12/16/92)   $18.00 (12/22/93)
          Taxes advanced and added to loan   $5,316 (approx.)    $4,927 (approx.)
          Accrued interest to 3-31-97        $ 49,234 (approx. for both Notes)

</TABLE>

     MBI's Chief Financial Officer will explain the basis for MBI's belief to 
you and/or your professional advisors, if you wish.

     13.  RELEASE.  In consideration for the payments, options, loan 
forgiveness, and other consideration described in this Letter Agreement, you 
hereby unconditionally, irrevocably, and absolutely release and discharge 
MBI, its employees, officers, directors, agents, stockholders, independent 
contractors, attorneys, consultants, predecessors, successors and assigns 
from any and all claims related in any way to any acts, transactions, or 
occurrences between you and MBI to date, including but not limited to all 
losses, liabilities, claims, charges, demands and causes of action, known or 
unknown, suspected or unsuspected, arising directly or indirectly out of, or 
in any way connected with, your employment with or resignation from MBI.  
This includes, but is not limited to, any claim of employment discrimination 
arising under federal, state or local law, including the Age Discrimination 
in Employment Act of 1967, as amended, the Americans with Disabilities Act, 
the California Fair Employment and Housing Act, any other statutory cause of 
action, and any tort or contract claims.

     WAIVER OF ADDITIONAL CLAIMS.  Section 1542 of the Civil Code of the 
State of California provides as follows:

     A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT 
KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE RELEASE, 
WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED HIS SETTLEMENT WITH THE 
DEBTOR.

You waive and relinquish any right or benefit which you may have under this 
section or any other provision of the statutory or nonstatutory law or any 
other jurisdiction to the full extent that you may lawfully waive all such 
rights and benefits.  In connection with such waiver and relinquishment, you 
acknowledge that you are aware that you, your attorneys or agents may 
hereafter discover claims or facts in addition to or different from those 
which they now know or believe to exist, but that it is your intention 
thereby fully, finally, and forever to release all claims, disputes, and 
differences, known or unknown, suspected or unsuspected, which now exist, may 
exist, or have existed between the parties, their employees, agents, assigns, 
and other privies.  Unless this provision shall have been procured by fraud, 
the releases given herein shall be effective regardless of the discovery or 
existence of any such claim or fact.

     14.  CONSEQUENCES OF BREACH.  If you breach this Letter Agreement, MBI 
may terminate it, cease providing payments and benefits hereunder, cancel 
your stock options, and recover all payments and benefits already paid, in 
addition to any other remedies it may have.

<PAGE>

Mr. James L. Barnhart, Ph.D.
May 30, 1997
Page 6


     15.  OTHER MATTERS.  You will receive materials prepared by Human 
Resources describing various rights and duties, including optional benefits, 
which will come into effect following your resignation.  You will also 
receive instruments as are customarily submitted to resigning employees.  You 
will cooperate fully in these separation meetings and execute or complete 
such instruments at the time of your resignation.<PAGE>

<PAGE>

Mr. James L. Barnhart, Ph.D.
May 30, 1997
Page 7


     16.  ACKNOWLEDGMENTS.  

          (a)       NO PRE-EXISTING OBLIGATION.  You acknowledge that but for 
the entry by you and MBI into this Letter Agreement, you are not entitled to 
the payments, stock options, loan forgiveness, and other consideration 
provided for in these agreements (with the exception of federal rights such 
as COBRA).

          (b)  TIME FOR REVIEW; EFFECTIVE DATE.  You acknowledge that you 
have been given 21 days to consider the terms of this Letter Agreement.  In 
addition, both parties acknowledge that you may revoke your acceptance of 
this Letter Agreement within seven days following your signature (which may 
occur during the 21-day period).

          (c)  ADVICE OF COUNSEL AND OTHER PROFESSIONAL ADVISORS.  You 
acknowledge that you have been advised in writing to consult with an attorney 
and an accountant or tax advisor before entering into these agreements.  You 
acknowledge either that you have done so and received counseling to your 
satisfaction, or that you have declined to do so and voluntarily executed 
this Letter Agreement without fraud or undue influence.

     17.  PROHIBITION AGAINST ASSIGNMENT.  You shall not assign this Letter 
Agreement or any of the rights, interests and benefits hereunder.  However, 
you may provide for the assignment, gift, bequest, or transfer of such 
benefits under this Letter Agreement to your survivor(s), or to a trust for 
their benefit, on your death, or in the event that you suffer a major 
disability. 

     18.  ENTIRE AGREEMENT.  This Letter Agreement between the parties dated 
May 30, 1997, constitutes the entire Agreement between the parties hereto and 
contains all of the agreements between the parties with respect to its 
subject matter.  This Letter Agreement supersedes any and all other 
agreements, either oral or in writing, between the parties hereto with 
respect to their subject matter, PROVIDED THAT Paragraphs 3 (Confidentiality) 
and 4-9 (relating to inventions made within a year of termination) of your 
Employment Agreement dated October 1, 1992, shall remain in effect.

     19.  BINDING EFFECT.  This Letter Agreement shall be binding upon and 
inure to the benefit of both parties and their respective heirs, legal 
representatives, executors, administrators, and successors.

     20.  GOVERNING LAW.  This Letter Agreement shall be subject to and 
governed by the laws of the State of California irrespective of the fact that 
you may become a resident of a different state.

     21.  AMENDMENT OF LETTER AGREEMENT.  No change or modification of this 
Letter Agreement shall be valid unless the same be in writing and signed by 
both parties.  No waiver of any provision of this Letter Agreement shall be 
valid unless in writing and signed by the person or party to be charged.

     22.  SEVERABILITY.  If any portion or portions of this Letter Agreement 
shall be, for any reason, deemed to be invalid or unenforceable, the 
remaining portion or portions shall nevertheless be valid, enforceable and 
carried into effect, unless to do so would clearly violate the present legal 
and valid intention of the parties hereto.

     23.  HEADINGS.  The headings of this Letter Agreement are inserted for 
convenience only and are not to be considered in construction of the 
provisions hereof.

<PAGE>

Mr. James L. Barnhart, Ph.D.
May 30, 1997
Page 8


     24.  WAIVER OF BREACH.  The waiver by  either of the parties hereto of 
any breach of any provision hereof shall not be construed to be a waiver of 
any succeeding breach of that provision or a waiver of any other provision of 
this Letter Agreement.

     25.  INDEMNIFICATION.  With respect to any claim against you arising out 
of your work for MBI as an officer or employee, you shall have rights of 
indemnification against MBI under MBI's certificate of incorporation and 
bylaws equivalent to those of an MBI officer.

                                      * * * *

     If you are in agreement with these items, please execute the duplicate 
originals of this Letter Agreement and return them to Pam Alexandra.

     Let me take this opportunity to thank you for your services to MBI over 
the past several years.  We all wish you every success in your future 
endeavors.

                              Sincerely,


                              /s/ Bobba Venkatadri
                              --------------------
                              Bobba Venkatadri
                              President and Chief Executive Officer


AGREED TO BY:


/s/ James L. Barnhart
- -----------------------
James L. Barnhart

Date:  May 30, 1997
       ------------


<PAGE>

                                                                EXHIBIT 10.46
                                       
                          FIRST AMENDMENT TO SUBLEASE



     THIS FIRST AMENDMENT TO SUBLEASE ("Amendment") effective as of February 
27, 1998 ("Effective Date"), is entered into by and between Molecular 
Biosystems, Inc., a Delaware corporation (the "Sublessor"), and Dura 
Pharmaceuticals, Inc., a Delaware corporation (the "Sublessee"). Sublessor 
and Sublessee are collectively hereinafter referred to as the "parties."

                                    RECITALS

          B.  Sublessor and Sublessee entered into a written Sublease 
effective October 1, 1997 (the "Sublease") pursuant to which Sublessor 
subleased to Sublessee and Sublessee subleased from Sublessor the Premises 
described therein. Sublessor holds the Premises and certain other premises 
(collectively, the "Master Premises") pursuant to a certain Master Lease made 
as of June 19, 1995 ("Master Lease"), by and between Radnor/Collins/Sorrento 
Partnership, as "Lessor," and Sublessor under this Sublease, as "Lessee." 

          C.  Sublessor and Sublessee now wish to make modifications to the 
Sublease to expand the Premises, revise the rental rate for the Premises, and 
to extend the Term of the Sublease, all in accordance with the terms and 
conditions set forth herein.

          D.  The parties now wish to amend the Sublease to reflect these 
changes and to make other modifications in consideration therefor.

     NOW, THEREFORE, in consideration of the above Recitals, and the mutual 
covenants contained herein, the parties agree as follows:

          1.  LEASE AMENDMENT.  A copy of the Sublease is attached hereto and 
incorporated herein as EXHIBIT A.  Except as expressly provided in this 
Amendment, the Sublease shall remain unmodified, in full force and effect.  
The capitalized terms used herein shall have the meanings ascribed to them in 
the Sublease unless otherwise indicated.  To the extent that there is any 
conflict between this Amendment and the Sublease, the provisions of this 
Amendment shall prevail.


<PAGE>


          2.  PREMISES.  

               2.1  Effective April 15, 1998 or such earlier date as 
Sublessor elects by five (5) days prior written notice to Sublessee ("First 
Expansion Date"), the Premises shall be expanded to include the entire Master 
premises except the Second Expansion Space (the "First Expansion Space") of 
the Building, as more particularly shown in EXHIBIT B.

               2.2  Effective June 1, 1998 or such earlier date as Sublessor 
elects by ten (10) days prior written notice to Sublessee ("Second Expansion 
Date"), the Premises shall be further expanded to include the entire Master 
Premises of Sublessor under the Master Lease as set forth in Section 2.1 of 
the Master Lease.  The space added to the Premises pursuant to this Section 
2.2 shall be known as the "Second Expansion Space."  Collectively, both the 
First Expansion Space and the Second Expansion Space shall be known as the 
"Expansion Space."
  
          3.  PROPORTIONATE SHARE.  

               3.1  On the First Expansion Date, the Sublessee's 
Proportionate Share, as set forth in the Basic Sublease Information and 
Section 1.1 of the Sublease shall be increased to ninety-five percent (95%).  

               3.2  On and after the Second Expansion Date, the Sublessee's 
Proportionate Share shall be increased to one hundred percent (100%).

          4.  BASE RENT.  

               4.1  From and after the First Expansion Date, the Base Rent 
for the Premises shall be $1.07 per rentable square foot, or a total of 
Fifty-Five Thousand Nine Hundred Seventy-Three Dollars and Eighty-Four Cents 
($55,973.84) per month.

               4.2  From and after the Second Expansion Date, the Base Rent 
for the Premises shall be Fifty-Eight Thousand Five Hundred Forty-One Dollars 
and Eighty-Four Cents ($58,541.84) per month.

               4.3  On July 1, 1998, and each anniversary thereof, 
Sublessee's Base Rent shall increase by four percent (4%) of Sublessee's Base 
Rent for the preceding month.

          5.  TERM.  The Term of the Sublease shall expire on December 
31,1999.

          6.  LIMITATION OF EXCLUSIONS.  From and after the Second Expansion 
Date, Sections 17.1 and 17.4 shall be incorporated into the Sublease, 
notwithstanding Section 7.2 of the Sublease.  

          7.  SUBLESSOR'S OBLIGATIONS.  Section 7.4 of the Sublease shall be 
deleted in its entirety and the following shall be substituted therefor:


                                      -2-

<PAGE>


          7.4  SUBLESSOR'S OBLIGATIONS.  Sublessee acknowledges that
               Sublessor shall be under no obligation to provide any
               services or satisfy any obligations or covenants of
               Master Landlord contained in the Master Lease;
               provided, however, Sublessor, upon written notice by
               Sublessee shall promptly and diligently attempt to
               enforce all obligations of Master Landlord under the
               Master Lease, provided that Sublessee reimburses
               Sublessor for all reasonable costs and expenses
               incurred in connection therewith.  

          8.  PHYSICAL CONDITION.  Sublessee and Sublessor recognize and 
agree that Sublessor would not sublease the Expansion Space to Sublessee and 
Sublessee would not sublease the Expansion Space from Sublessor except on an 
"as is" basis and acknowledges that neither Sublessee nor Sublessor has made 
any representations of any kind, express or implied, in connection with the 
Improvements or physical conditions on, or bearing on, the Expansion Space, 
including without limitation the suitability of the Expansion Space for 
Sublessee's purposes.  Sublessee further recognizes and agrees that neither 
Sublessor nor Master Landlord shall be required to perform any work of 
construction, alteration or maintenance of or to the Expansion Space except 
as set forth in the Master Lease.

          9.  SUBLESSEE'S ADDITIONAL OBLIGATIONS.  From and after the Second 
Expansion Date, Sublessee shall expressly assume and shall be directly 
responsible for all Lessee's obligations under Section 11 of the Master 
Lease. As Sublessor in its sole discretion may from time to time demand, 
Sublessee shall provide Sublessor within five (5) business days with copies 
of all contracts, invoices, accounting records and any other records 
associated with Sublessee's fulfillment of the Lessee's obligations under 
Section 11 of the Master Lease.  However, at Sublessor's sole discretion, 
Sublessor may choose to directly fulfill any or all of Sublessor's 
obligations under Section 11 of the Master Lease and be compensated for any 
such expenses reasonably incurred pursuant to Section 3.2 of the Sublease and 
Section 3.2 of this Amendment.  Any maintenance contracts entered into by 
Sublessee for obligations covered by this Section 9 shall by their terms be 
freely assignable to Sublessor, and Sublessee shall promptly assign any such 
contracts to Sublessor if Sublessor at its sole discretion so requests.

          10.  FORMER BUILDING AREA COMMON AREAS.   As of the Effective Date, 
Sublessor shall have no responsibility for the care, management or expenses 
of any portion of the Building Common Area incorporated into Sublessee's 
Premises pursuant to Sections 2.1 and 2.2 of this Amendment.  As of the 
Second Expansion Date, all Building Common Areas shall be included in the 
Premises, Sublessor shall have no maintenance, repair or other obligations in 
connection therewith and Sublessee shall have direct responsibility for 
repair and maintenance thereof, in accordance with the terms and conditions 
of the Sublease and the Master Lease.


                                     -3-

<PAGE>

          11.  SECURITY DEPOSIT.   Upon executing this Amendment, Sublessee 
shall deposit with Sublessor a Security Deposit in the amount of Fifty-Eight 
Thousand Five Hundred Forty-One Dollars and Eighty-Four Cents ($58,541.84).  
The Security Deposit shall secure Sublessee's obligations under the Sublease 
to pay rent and other monetary amounts, to maintain the Premises and repair 
damages thereto, to surrender the Premises to Sublessor in clean and sanitary 
condition and to discharge Sublessee's other obligations hereunder.  
Sublessor may use and commingle the Security Deposit with other funds of 
Sublessor.  If Sublessee fails to perform Sublessee's obligations hereunder, 
Sublessor may, but without any obligation to do so, apply all or any portion 
of the Security Deposit towards fulfillment of Sublessee's unperformed 
obligations.  If Sublessor does so apply any portion of the Security Deposit, 
Sublessee shall immediately pay Sublessor a sufficient amount in cash to 
restore the Security Deposit to the full original amount.  In the event that 
Sublessor shall expend the same in order to cure Sublessee's default 
hereunder, Sublessee's failure to forthwith remit to Sublessor a sufficient 
amount in cash to restore the Security Deposit to the original sum deposited 
within five (5) days after Sublessee's receipt of notice from Sublessor that 
such amounts have been so expended shall constitute a material default of the 
Sublease.  The Security Deposit shall be held by Sublessor without liability 
for interest on the same.  Upon termination of this Lease, if Sublessee has 
then performed all of Sublessee's obligations hereunder, Sublessor shall 
return the Security Deposit to Sublessee.  If Sublessor sells or otherwise 
transfers Sublessor's rights or interest under this Lease, Sublessor may 
deliver the Security Deposit to the transferee, whereupon Sublessor shall be 
released from any further liability to Sublessee with respect to the Security 
Deposit.

          12.  NOTICES.  Sublessee shall concurrently send copies to 
Sublessor, at Sublessor's Address for Notice set forth in the Basic Sublease 
Information of the Sublease, of all notices Sublessee sends to Master 
Landlord and shall promptly send to Sublessor copies of all notices received 
from Master Landlord.

          13.  INDEMNIFICATION.  Sublessee shall indemnify, protect, defend 
and hold Sublessor harmless from and against any and all claims, liabilities, 
penalties, losses or expenses (including reasonable attorneys' fees and 
costs) arising in connection with Sublessee's breach or failure to perform 
any of Sublessee's obligations under the Sublease as modified by this 
Amendment and/or the Master Lease.  Sublessor shall indemnify, protect, 
defend and hold Sublessee harmless from and against any and all claims, 
liabilities, penalties, losses or expenses (including reasonable attorneys' 
fees and costs) arising in connection with Sublessor's breach or failure to 
perform any of Sublessor's obligations under the Sublease as modified by this 
Amendment and/or the Master Lease.
          

          14.  MASTER LANDLORD'S CONSENT.  This Amendment is conditioned upon 
receipt of Master Landlord's written approval of this Amendment prior to the 
First Expansion Date.  If Master Landlord withholds its consent, this 
Amendment shall be deemed void and of no effect.


                                       -4-

<PAGE>

          15.  AUTHORITY; COUNTERPARTS.  Each person executing this Amendment 
on behalf of a party represents that he or she is authorized and empowered to 
do so and to thereby bind the party on whose behalf he or she is signing.  
This Amendment may be executed in any number of counterparts, each of which 
shall be deemed to be an original and all of which together shall comprise 
but a single instrument.


                                       -5-


<PAGE>

                      [SIGNATURE PAGE TO SUBLEASE AMENDMENT]

     IN WITNESS WHEREOF, the parties hereto have executed this Amendment 
effective as of the date and year hereinabove written.

                                             SUBLESSOR:

                                             MOLECULAR BIOSYSTEMS, INC.
                                             a Delaware corporation 


                                             By:  /s/ Gerard A. Wills
                                                  ---------------------------
                                                  Its Chief Financial Officer


                                             By:  ___________________________
                                                  Its___________
                                   


                                             SUBLESSEE:

                                             DURA PHARMACEUTICALS, INC.
                                             a Delaware corporation

                                             By:   /s/ M.R. Woodbury 
                                                   ---------------------------
                                                   Its Senior Vice President


                                             By:  ___________________________
                                                  Its___________



                                       -6-

<PAGE>

                                                                  EXHIBIT 10.47


                                       

                                    SUBLEASE


                         5828 PACIFIC CENTER BOULEVARD 
                                  (SUITE 200)

                             SAN DIEGO, CALIFORNIA






                           MOLECULAR BIOSYSTEMS, INC.
                             a Delaware corporation

                                 as Sublessor 

                                      and

                           DURA PHARMACEUTICALS, INC.
                             a Delaware corporation

                                  as Sublessee






                                October 1, 1997


<PAGE>

                           BASIC SUBLEASE INFORMATION


DEFINED TERMS


Building:                5828 Pacific Center Boulevard 
                         San Diego, California  92121

Effective Date:          October 1, 1997

Commencement Date:       October 1, 1997

Rent Commencement
Date:                    October 1, 1997 

Master Landlord:         Radnor/Collins/Sorrento Partnership, 
                         a California general partnership 

Master Landlord's
Address for              5963 La Place Court, Suite 109
Rent and Notice:         Carlsbad, California  92008

                         with a copy to:

                         RADNOR PACIFIC CORPORATE 
                         CENTER CORPORATION
                         9255 Town Center Drive, Suite 100
                         San Diego, California  92121
                    
Master Lease:            That certain Pacificpoint Triple Net Lease by and 
                         between Master Landlord and Sublessor, dated May 18, 
                         1995, a true and complete copy of which is attached 
                         hereto and incorporated herein as EXHIBIT A.

Master Premises:         The Building, consisting of approximately 54,712 square
                         feet.

Premises:                Improved real property as more particularly described 
                         in the Master Lease, consisting of a portion of the 
                         Master Premises, containing approximately 32,827 
                         rentable square feet as depicted on EXHIBIT B 
                         attached hereto and incorporated herein, and a non-
                         exclusive right to utilize all of Sublessor's 
                         leasehold interest in the Common Areas of the Project 
                         (as defined in Section 49 of the Master Lease),
                         including, without limitation, Sublessor's parking 
                         rights (on a proportionate basis) and rights to any 
                         appurtenant easements under the Master Lease.  The 
                         Premises shall include Sublessee's right to utilize 
                         the common areas within the Building ("Building 
                         Common Areas") as depicted on EXHIBIT B-1.


                                       i

<PAGE>


Monthly Base Rent:       SUBLEASE MONTHS    RENT PER SQ.FT.   MONTHLY NNN RENT
                                1-9             $ .94             $30,858
                              10-12               .98             $32,170

Security            
Deposit:                 None

Sublessee:               Dura Pharmaceuticals, Inc., a Delaware corporation 

Sublessee's              5880 Pacific Center Boulevard 
Address for Notice:      San Diego, California  92121
                         Attn:  Mitch Woodbury

Sublessee's              
Proportionate Share:     Sixty Percent (60%) of Building Operating Expenses
                         and Taxes as defined in Paragraph 3.2 of this Sublease.

Sublessor:               Molecular Biosystems, Inc. 
                         a Delaware corporation

Sublessor's              10030 Barnes Canyon Road 
Address for              San Diego, California 92121
Notice:                  Attn:  Jerry Wills 

Term:                    The term ("Term") of this Sublease shall begin on the
                         Commencement Date and expire on December 31, 1998. 
                         Notwithstanding the foregoing, the Term shall cease 
                         upon, and shall not refer to any period of time after, 
                         termination of the Master Lease (whether pursuant to 
                         the terms of the Master Lease, by operation of law, or 
                         otherwise).

Permitted Uses:          Those Permitted Uses set forth in paragraph 5 of the
                         Master Lease.

Brokers:                 Shaun Burnett, Irving Hughes Group, Inc.


Exhibits:                EXHIBIT A - Master Lease
                         EXHIBIT B - Premises Depiction 
                         EXHIBIT B-1 - Building Common Areas Depiction 
                         EXHIBIT C - Work List
                         EXHIBIT D - Exit Assessment 


                                     ii

<PAGE>

                              TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                 PAGE
<S>                                                                              <C>
ARTICLE 1 - PREMISES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
     1.1    Demise of Premises . . . . . . . . . . . . . . . . . . . . . . . . . .  1
     1.2    Condition of Premises. . . . . . . . . . . . . . . . . . . . . . . . .  2
          1.2.1     Physical Condition . . . . . . . . . . . . . . . . . . . . . .  2
          1.2.2     Environmental Assessment . . . . . . . . . . . . . . . . . . .  2
          1.2.3     No Representations . . . . . . . . . . . . . . . . . . . . . .  2
     1.3  Validity of Master Lease . . . . . . . . . . . . . . . . . . . . . . . .  2

ARTICLE 2 - TERM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3

ARTICLE 3 - SUBLESSEE'S PAYMENT OBLIGATIONS. . . . . . . . . . . . . . . . . . . .  3
     3.1    Monthly Base Rent. . . . . . . . . . . . . . . . . . . . . . . . . . .  3
     3.2    Net Rental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3

ARTICLE 4 - [INTENTIONALLY DELETED]. . . . . . . . . . . . . . . . . . . . . . . .  4

ARTICLE 5 - USE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4

ARTICLE 6 - ALTERATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4

ARTICLE 7 - RIGHTS AND DUTIES OF SUBLESSEE . . . . . . . . . . . . . . . . . . . .  5
     7.1    Sublease Subject to Master Lease . . . . . . . . . . . . . . . . . . .  5
     7.2    Exclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     7.3    Time for Notice. . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     7.4    Sublessor's Obligations. . . . . . . . . . . . . . . . . . . . . . . .  6
     7.5    Use of Building Common Areas . . . . . . . . . . . . . . . . . . . . .  6
     7.6    Entry by Sublessor . . . . . . . . . . . . . . . . . . . . . . . . . .  6

ARTICLE 8 - INDEMNIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . .  7

ARTICLE 9 - INSURANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7

ARTICLE 10 - DEFAULTS AND REMEDIES . . . . . . . . . . . . . . . . . . . . . . . .  7

ARTICLE 11 - NOTICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7

ARTICLE 12 - ASSIGNMENT AND SUBLETTING . . . . . . . . . . . . . . . . . . . . . .  8

ARTICLE 13 - REPAIRS AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . .  8
</TABLE>

                                       i


<PAGE>

<TABLE>
<CAPTION>
                                                                                 PAGE
<S>                                                                              <C>
ARTICLE 14 - DAMAGE AND DESTRUCTION. . . . . . . . . . . . . . . . . . . . . . . .  8
     14.1    Termination of Master Lease . . . . . . . . . . . . . . . . . . . . .  8
     14.2    Continuation of Sublease  . . . . . . . . . . . . . . . . . . . . . .  8

ARTICLE 15 - CONDEMNATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     15.1    Total Condemnation. . . . . . . . . . . . . . . . . . . . . . . . . .  9
     15.2    Partial Condemnation. . . . . . . . . . . . . . . . . . . . . . . . .  9
     15.3    Sublessee's Award . . . . . . . . . . . . . . . . . . . . . . . . . .  9

ARTICLE 16 - SURRENDER OF PREMISES . . . . . . . . . . . . . . . . . . . . . . . .  9

ARTICLE 17 - MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     17.1    Entire Agreement. . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     17.2    Captions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     17.3    Master Landlord's Consent . . . . . . . . . . . . . . . . . . . . . . 10
     17.4    Authority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     17.5    Attorneys' Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     17.6    Broker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
</TABLE>


                                       ii

<PAGE>

                               SUBLEASE AGREEMENT


     THIS SUBLEASE AGREEMENT ("Sublease") is entered as of the Effective Date 
by and between Sublessor and Sublessee.

     THE PARTIES ENTER this Sublease on the basis of the following facts, 
understandings and intentions:

     A.   Master Landlord is the current Landlord of the Premises.  Sublessor 
is presently the Tenant of the Premises pursuant to the Master Lease.  A copy 
of the Master Lease with all amendments, exhibits and addenda thereto, is 
attached hereto as EXHIBIT A and incorporated herein by this reference.

     B.   Sublessor desires to sublease the Premises to Sublessee and 
Sublessee desires to sublease the Premises from Sublessor on all of the 
terms, covenants and conditions set forth herein.

     C.   All of the terms and definitions in the Defined Terms of the Basic 
Sublease Information of this Sublease are incorporated herein by this 
reference. Unless otherwise defined herein or the context otherwise requires, 
all capitalized terms shall have the meanings given them in the Master Lease.

     NOW, THEREFORE, IN CONSIDERATION of the mutual covenants and promises of 
the parties, the parties hereto agree as follows:

                              ARTICLE 1 - PREMISES

     1.1  DEMISE OF PREMISES.  Sublessor hereby subleases to Sublessee and 
Sublessee hereby subleases from Sublessor the Premises, for the Term and upon 
all of the terms and conditions herein set forth.  The Premises shall be used 
by Sublessee for those uses specifically set forth in the Basic Sublease 
Information, subject to the terms and conditions of Section 5 of the Master 
Lease.  In addition, Sublessor shall lease to Sublessee, and Sublessee shall 
lease from Sublessor, any and all permanent improvements ("Improvements") in 
or on the Premises constructed and/or owned by Master Landlord and/or 
Sublessor upon all of the terms, covenants and conditions herein contained.  
As used herein, "Premises" shall include the Premises and the Improvements.  
The Premises represents sixty percent (60%) of the total space in the Master 
Premises, which shall be Sublessee's "Proportionate Share" of Operating 
Expenses and Taxes (as defined in Paragraph 3.2 of this Sublease).


                                       1

<PAGE>

     1.2  CONDITION OF PREMISES.

          1.2.1     PHYSICAL CONDITION.  Sublessor and Sublessee acknowledge 
and agree that Sublessee is currently the occupant of the Premises under a 
Sublease from Sunward, which expires immediately prior to the Commencement 
Date.  By occupying the Premises on the Commencement Date, Sublessee shall be 
deemed to have acknowledged that it accepts the Premises in their current 
condition.  As of the Effective Date, Sublessee acknowledges that Sublessee 
has conducted Sublessee's own investigation of the Premises and the physical 
condition thereof, which in Sublessee's judgment affect or influence 
Sublessee's use of the Premises and Sublessee's willingness to enter this 
Sublease and that neither Sublessor nor any of its employees or agents have 
made or shall have any liability for any representations or warranties, 
express or implied, with respect to the condition of the Premises.  Both 
parties hereby acknowledge and agree that the Premises shall be subleased in 
their "as is" condition as of the Effective Date.  On September 30, 1997 
Sublessor, Sublessee and Master Landlord performed a walk-through inspection 
of the Premises in order to document the condition of the Premises on the 
Commencement Date for purposes of Sublessee's restoration obligations upon 
surrender of the Premises at the expiration of the Sublease Term ("Entrance 
Assessment").  As soon as practicable, Sublessor and Sublessee shall prepare, 
and both parties shall sign, a list of any additional work or repairs to be 
performed in order to restore the Premises from its current condition to the 
surrender condition required of Sublessee at expiration of the Term of this 
Sublease (the "Work List"), which shall be attached to the Sublease as 
EXHIBIT C.  In no event shall such additional work or repairs require 
Sublessee to improve the Premises to a condition better than that in which 
such Premises were received by Sublessee.  In addition to the restoration 
work set forth on the Work List, Sublessee agrees on the last day of the 
Sublease Term to surrender the Premises unto Sublessor in accordance with 
Article 16 of this Sublease. 

          1.2.2     ENVIRONMENTAL ASSESSMENT.  Prior to Sublessee's surrender 
of the Premises, Sublessee shall conduct an Exit Assessment, consisting of an 
updated Phase I Environmental Assessment and such other tests as are listed 
on the Exit Assessment attached hereto as EXHIBIT D.  Sublessor shall receive 
a copy of the report(s) of the Sublessee's Exit Assessment, and said 
report(s) shall be evidence of the physical condition of the Premises upon 
Sublessee's surrender of the Premises.  The cost of the Sublessee's Exit 
Assessment shall be paid by Sublessee.  Sublessee's Exit Assessment shall be 
performed by an independent environmental consultant reasonably acceptable to 
Sublessor.

          1.2.3     NO REPRESENTATIONS.  Sublessee and Sublessor recognize 
and agree that Sublessor would not sublease the Premises to Sublessee and 
Sublessee would not sublease the Premises from Sublessor except on an "as is" 
basis and acknowledges that neither Sublessee nor Sublessor has made any 
representations of any kind, express or implied, in connection with the 
Improvements or physical conditions on, or bearing on, the Premises, 
including without limitation the suitability of the Premises for Sublessee's 
purposes.  Sublessee further recognizes and agrees that neither Sublessor nor 
Master Landlord shall be required to perform any work of construction, 
alteration or maintenance of or to the Premises except as set forth in the 
Master Lease.

     1.3  VALIDITY OF MASTER LEASE.  Sublessor hereby warrants that the 
Master Lease attached hereto as EXHIBIT A is complete and in full force and 
effect, and that Sublessor is not in material default thereunder beyond 
expiration of any applicable cure or notice period, and that the area which 
is the subject of the Sublease has not been previously assigned or subleased 
by Sublessor.


                                       2

<PAGE>

                               ARTICLE 2 - TERM

          The term of this Sublease shall be for the Term set forth in the 
Basic Sublease Information provided that upon full execution of this Sublease 
by Sublessor and Sublessee, and provided that on or before the Commencement 
Date Sublessee provides Sublessor with (i) the certificates evidencing the 
insurance required by Article 9 of this Sublease and (ii) the first month's 
Base Rent, the Term shall commence on the Commencement Date and expire on 
September 30, 1998 ("Expiration Date").

                  ARTICLE 3 - SUBLESSEE'S PAYMENT OBLIGATIONS

     3.1  MONTHLY BASE RENT.  The Monthly Base Rent shall be payable in 
advance in equal monthly installments in accordance with the schedule for 
payment of Monthly Base Rent set forth in the Basic Sublease Information, 
commencing with the Rent Commencement Date.  Upon the execution of this 
Sublease by Sublessor and Sublessee, Sublessee shall deposit with Sublessor 
prepaid Rent in an amount equal to Thirty-Four Thousand Five Hundred 
Ninety-Six and 40/100's Dollars ($34,596.40) for the first month's Base Rent 
("Prepaid Rent").  Sublessee shall thereafter pay to Sublessor the monthly 
Base Rent in advance, on or before the first day of each month, beginning on 
the first day of the calendar month succeeding the Commencement Date.  Base 
Rent and any additional rent due hereunder shall be payable to Sublessor, 
without further notice or demand and without deduction or offset, in lawful 
money of the United States of America at the address specified in the Basic 
Sublease Information or at such other address as Sublessor may from time to 
time designate in writing.  If the Term shall end on a day other than the 
last day of a calendar month, then Rent for the last month of the Term shall 
be prorated on a per diem basis, with respect to the portions of the last 
fractional calendar month included in the Term.  

     3.2  NET RENTAL.  In addition to Monthly Base Rent, Sublessee shall be 
responsible for Sublessee's Proportionate Share (as set forth in the Basic 
Sublease Information), of Building Operating Expenses and Taxes and all other 
additional rent which may be imposed, at any time, on Sublessor pursuant to 
the Master Lease; provided that Sublessee shall not be responsible for any 
penalties, interest or other costs incurred by Sublessor under the Master 
Lease that are caused by Sublessor's failure to pay rent to Master Landlord 
in a timely manner in accordance with the Master Lease, unless such failure 
is cause by Sublessee's default or failure to make timely payments to 
Sublessor in accordance with this Sublease.  As used herein, "Sublease Rent" 
shall include Base Rent, Sublessee's Proportionate Share of Building 
Operating Expenses and Taxes, as defined below, and all other amounts payable 
by Sublessee to Sublessor hereunder.   Sublessee shall be responsible for 
Sublessee's Proportionate Share of all such costs and expenses for each and 
every month of the Sublease Term. Sublessee shall pay its Proportionate Share 
of Building Operating Expenses and Taxes no later than thirty (30) days 
following Sublessee's receipt of written demand therefor.

     "Building Operating Expenses and Taxes" shall consist of (1) all real 
property taxes, insurance premiums, Common Area Expenses, Common Area 
Assessments and other similar charges or expenses incurred by Sublessor 
pursuant to the Master Lease; (2) any personal property taxes payable by 
Sublessor in respect of the Premises or any trade fixtures, furnishings, 
equipment or other personal property either on the Premises or owned by 
Sublessee wherever located; and (3) Building Common Area Costs.  


                                       3

<PAGE>

     "Building Common Area Costs" shall mean all costs and expenses of 
whatever kind or nature incurred by Sublessor in connection with repair or 
maintenance of the Building Common Area or any other portion of the Building 
other than the portion of the Master Premises currently occupied by Sublessor 
("Sublessor's Premises") (and not including Sublessor's personal property or 
trade fixtures located in any part of the Building or Common Areas), 
including without limitation: (i) all costs of maintenance, repair, waste 
disposal, janitorial, security, landscaping, and HVAC or other common utility 
or service maintenance; (ii) any and all costs of maintenance and repair 
required to be performed by Sublessor pursuant to Section 11.1 of the Master 
Lease, BUT EXCLUDING those costs arising from maintenance and repair of the 
interior and nonstructural portions of Sublessor's Premises; and (iii) all 
charges for heat, water, sewer, gas, electricity, ventilating, 
air-conditioning and other utilities and similar services to the Building 
that are not separately metered to the Premises. Notwithstanding anything to 
the contrary herein, Building Operating Costs, shall not include:  (i) any 
capital expenditures made pursuant to Section 11.3(b) of the Master Lease (to 
the extent that Sublessor receives a rent credit from Master Landlord for 
such expenditure); (ii) costs incurred due to violation of any terms or 
conditions of the Master Lease, this Sublease or any other lease relating to 
any portion of the Building; (iii) costs of any repair for which Sublessor 
receives reimbursement from insurance proceeds or the Master Lessor or any 
other third party (other than through its Proportionate Share of Building 
Operating Expenses and Taxes); (iv) damage and repairs necessitated by the 
gross negligence or willful misconduct of Sublessor or Sublessor's officers, 
employees, agents or contractors; (v) reserves by Sublessor (not Master 
Lessor) for the repair, replacement or improvement of the Master Premises or 
any portion thereof; (vi) all Annual Base Rent due under the Master Lease; 
(vii) all costs and expenses incurred in connection with any sublease and/or 
assignment negotiations and transactions with present or prospective 
subtenants or other occupants or assignees of the Master Premises (except for 
subtenants or assignees of Sublessee's interest in this Sublease or the 
Premises); (viii) costs and expenses incurred in renovating or otherwise 
improving, decorating, painting or redecorating any portion of the 
Sublessor's Premises or otherwise incurred for the sole benefit of Sublessor 
or the Sublessor's Premises; (ix) any costs, fines, or penalties incurred due 
to violations by Sublessor or other subtenant of the Master Premises of any 
governmental rule or authority, this Sublease or any other lease in the 
Project, or due to Landlord's negligence or willful misconduct; (x) wages, 
salaries, or other compensation paid to any employees of Sublessor; (xii) 
Sublessor's general corporate overhead and administrative expenses and (xiii) 
expenses incurred by Sublessor in connection with services, utilities or 
other benefits to Sublessor, or its agents, employees, officers, directors or 
invitees in the Building, which are not offered to Sublessee or are not of 
the nature of services, utilities or benefits generally provided to tenants 
of industrial premises in the vicinity of the Building.  Any capital 
expenditures included in Building Common Area Costs shall be amortized on a 
straight line basis over the term of the Master Lease, and Sublessee shall be 
liable only for that portion allocable to the remaining term of this Sublease.

                                   ARTICLE 4

                            [INTENTIONALLY DELETED]

                                      4

<PAGE>

                                ARTICLE 5 - USE

     The Premises are to be used for the Permitted Uses, and for no other 
purpose or business without the prior written consent of Sublessor.  In no 
event shall the Premises be used for a purpose or use prohibited by the 
Master Lease.

                            ARTICLE 6 - ALTERATIONS

     Sublessee shall not, without Sublessor's prior written consent, which 
consent shall not be unreasonably withheld by Sublessor, make or cause to be 
made any alterations, additions or improvements to the Premises (or any 
changes to the Improvements) except for interior non-structural alterations 
not exceeding Ten Thousand ($10,000) in cumulative costs during the Term of 
this Sublease.  It shall be deemed reasonable for Sublessor to withhold its 
consent to any alterations unless and until Sublessee delivers to Sublessor 
reasonable security for the cost of removal of the alterations.  All 
alterations, additions or improvements requiring Master Landlord's consent 
shall also require Sublessor's prior written consent.  As part of such 
consent, Sublessee shall also obtain Master Landlord's written notice 
regarding whether removal of such alterations will be required by Master 
Landlord as part of the surrender obligations under the Master Lease.  
Sublessee shall remove all alterations required to be removed by Master 
Lessor or Sublessor, and repair all damage caused thereby, prior to 
expiration of the Term of this Sublease.  Sublessee shall defend, indemnify 
and hold harmless Sublessor from all liabilities, including restoration 
charges, which may be imposed by Master Landlord or other parties due to 
Sublessee's alterations, additions or improvements.


                                       5

<PAGE>


                   ARTICLE 7 - RIGHTS AND DUTIES OF SUBLESSEE

     7.1  SUBLEASE SUBJECT TO MASTER LEASE.  It is expressly understood, 
acknowledged and agreed by Sublessee that this Sublease shall incorporate by 
reference the terms, conditions and covenants of the Master Lease, except as 
excluded in Section 7.2 below, modified as appropriate in the circumstances 
so as to make such Sections applicable only to the subleasing hereunder by 
Sublessor of the Premises during the Term of this Sublease.  Sublessee shall 
be subject to, bound by and comply with all of said Sections of the Master 
Lease with respect to the Premises accruing during the Term of this Sublease, 
and shall satisfy all such terms and conditions of the Master Lease for the 
benefit of both Sublessor and Master Landlord, it being understood and agreed 
that wherever in the Master Lease the word "Tenant" appears, for the purposes 
of this Sublease, the word "Sublessee" shall be substituted (subject to the 
limitations set forth in this Sublease), wherever in the Master Lease the 
word "Landlord" appears, for the purposes of this Sublease, the words "Master 
Landlord" (and, as applicable hereunder, "Sublessor") shall be substituted; 
and wherever in the Master Lease the word "Premises" appears, for the 
purposes of this Sublease, the words "Master Premises" shall be substituted; 
and that upon the breach of any of said terms, conditions or covenants of the 
Master Lease by Sublessee or upon the failure of Sublessee to pay Rent or 
comply with any of the provisions of this Sublease, Sublessor may exercise 
any and all rights and remedies granted to Master Landlord by the Master 
Lease.  Sublessee expressly acknowledges, notwithstanding anything to the 
contrary in this Sublease, that Sublessee's duty to indemnify, protect, 
defend and hold Sublessor harmless from and against any and all claims, 
liabilities, penalties, losses or expenses (including reasonable attorneys 
fees and costs) pursuant to this Sublease, and as more specifically set forth 
in Section 14 of the Master Lease, shall include Sublessor's duty to 
indemnify, defend, protect and hold Master Landlord harmless from and against 
any and all claims, liabilities, penalties, forfeitures, losses or expenses 
(including attorneys' fees and costs).  Sublessor shall indemnify, protect, 
defend and hold Sublessee harmless from and against any and all claims, 
liabilities, penalties, forfeitures, losses or expenses (including attorneys' 
fees and costs) arising from Sublessor's breach or failure to perform any 
obligation under the Master Lease that is caused by:  (a) Sublessor's breach 
or failure to perform under this Sublease; or (b) any negligent or tortious 
act or omission of Sublessor, its officers, agents, employees, invitees or 
contractors relating to the Premises.  

          It is further understood and agreed that Sublessor has no duty or 
obligation to Sublessee under the aforesaid Sections of the Master Lease 
other than to maintain the Master Lease in full force and effect during the 
term of this Sublease and to pay the difference between the Sublease Rent and 
the Rent due and payable under the Master Lease; provided, however, that 
Sublessor shall not be liable to Sublessee for any earlier termination of the 
Master Lease which is not due to the fault of Sublessor.  In the event of any 
conflict between this Sublease and the Master Lease, the more restrictive 
provision shall control, as between Sublessor and Sublessee.  Whenever the 
provisions of the Master Lease incorporated as provisions of this Sublease 
require the written consent of Landlord, said provisions shall be construed 
to require the written consent of both Master Landlord and Sublessor.  
Sublessee hereby acknowledges that it has read and is familiar with all the 
terms of the Master Lease, and agrees that this Sublease is subordinate and 
subject to the Master Lease and that any termination thereof without the 
fault of Sublessor shall likewise terminate this Sublease.

     7.2  EXCLUSIONS.  The terms and provisions of the following Sections of 
the Master Lease are not incorporated into this Sublease:  Master Lease 
Sections 2.1, 3.1, 3.2, 4.1, 4.2, 4.3, 9, 17.1, 17.4, 50.3.  Section 37.1 
shall apply only to Master Landlord.


                                       6

<PAGE>

     7.3  TIME FOR NOTICE.  The time limits provided for in the provisions of 
the Master Lease for the giving of notice, making of demands, performance of 
any act, condition or covenant, or the exercise of any right, remedy or 
option, are amended for the purposes of this Sublease by lengthening or 
shortening the same in each instance by five (5) days, as appropriate, so 
that notices may be given, demands made, or any act, condition or covenant 
performed, or any right, remedy or option hereunder exercised, by Sublessor 
or Sublessee, as the case may be, within the time limit relating thereto 
contained in the Master Lease.  If the Master Lease allows only five (5) days 
or less for Sublessor to perform any act, or to undertake to perform such 
act, or to correct any failure relating to the Premises or this Sublease, 
then Sublessee shall nevertheless be allowed three (3) days to perform such 
act, undertake such act and/or correct such failure.

     7.4  SUBLESSOR'S OBLIGATIONS.  It shall be the obligation of Master 
Landlord (i) to provide or cause to be provided all services to be provided 
by Landlord under the terms of the Master Lease and (ii) to satisfy all 
obligations and covenants of Master Landlord made in the Master Lease, 
including without limitation, the obligations of Sections 11.3 and 15.2 of 
the Master Lease. Sublessee acknowledges that Sublessor shall be under no 
obligation to provide any such services or satisfy any such obligations or 
covenants; provided, however, Sublessor, upon written notice by Sublessee, 
shall promptly and diligently attempt to enforce all obligations of Master 
Landlord under the Master Lease, provided that Sublessee reimburses Sublessor 
for all reasonable costs and expenses incurred in connection therewith.

     7.5  USE OF BUILDING COMMON AREAS.  Sublessee shall comply with all 
reasonable and non-discriminatory rules and regulations established by 
Sublessor with respect to use of the Building Common Areas, and shall insure 
compliance therewith by all of Sublessee's employees, contractors and 
invitees.  Without limiting the generality of the foregoing, Sublessee shall 
insure that there is no consumption of food by Sublessee's employees, agents, 
contractors or invitees in the lobby, and shall promptly comply with all 
reasonable requests of Sublessor intended to comply with Good Laboratory 
Practices and/or Good Manufacturing Practices.  Sublessor shall maintain the 
Building Common Area in a clean, safe and sanitary condition.

     7.6  ENTRY BY SUBLESSOR.  Sublessor shall have the right, upon at least 
24 hours advance notice (except in an emergency, in which case no notice 
shall be required) to enter upon the Premises for purposes of maintenance and 
repair, and to ensure compliance by Sublessee with its obligations pursuant 
to this Sublease.  Sublessee shall provide Sublessor with two keys (including 
card keys) to all doors of the Premises in order to facilitate such entry.  
In addition, Sublessor shall have the right to show the Premises to 
prospective lenders, partners, subtenants and their assigns during normal 
business hours on at least 24 hours' prior notice. 

                          ARTICLE 8 - INDEMNIFICATION

     Sublessee covenants to indemnify, defend, protect and hold Sublessor, 
its agents, officers, employees, and contractors harmless from and against 
(i) any and all claims, causes of action, obligations, liabilities, costs and 
expenses (including reasonable attorneys' fees and costs) to the extent 
arising out of or in connection with Sublessee's use or occupancy of the 
Premises, the Common Areas and /or the Building Common Areas before or after 
the commencement of the Term of this Sublease, and (ii) the breach of this 
Sublease (or, to the extent incorporated herein, the Master Lease) by 


                                      7

<PAGE>

Sublessee, its employees, agents, contractors or invitees.  Sublessor 
covenants to indemnify, defend, protect and hold Sublessee harmless from and 
against any and all claims, causes of action, obligations, liabilities, costs 
and expenses (including reasonable attorney fees and costs) to the extent 
arising out of or in connection with Sublessor's use or occupancy of the 
Sublessor's Premises, Common Areas and/or the Building Common Areas before or 
after the commencement of the Term of this Sublease and (iii) the breach of 
this Sublease or the Master Lease by Sublessor, its employees, agents, 
contractors or invitees.

                            ARTICLE 9 - INSURANCE

     Sublessee covenants to obtain and maintain the insurance policies 
required to be maintained by Sublessor under Section 15.1, 15.2(c), 15.2(d) 
and 15.3 of the Master Lease naming Sublessor as an additional insured; to 
provide Sublessor with certificates evidencing such insurance; and not to 
merit cancellation or termination of such required insurance policies without 
giving at least fifteen (15) days prior written notice to Sublessor and 
Master Landlord.  Sublessee shall deliver to Sublessor, from time to time and 
upon Sublessor's or Master Landlord's reasonable written request, 
certificates of insurance indicating that the required policies of insurance 
are in full force and effect throughout the entire term of this Sublease.  
All insurance policies required to be carried by Sublessor pursuant to the 
Master Lease shall be carried by Sublessee, covering Sublessee's liability, 
and all such policies shall be written in accordance with the requirements 
for such insurance set forth in Section 15.1 of the Master Lease.

                       ARTICLE 10 - DEFAULTS AND REMEDIES

     In the event of a default by Sublessee, Sublessor shall have all of the 
rights and remedies against Sublessee as are set forth in Section 19 of the 
Master Lease as though Sublessor were the landlord named therein and 
Sublessee was the tenant named therein.

                              ARTICLE 11 - NOTICES

     All notices or correspondence provided for herein shall be in writing 
and shall be sent by certified mail, postage prepaid, return receipt 
requested, or by a nationally-recognized overnight delivery company which 
provides a receipt evidencing delivery, in which event they shall be deemed 
received on the date of delivery as evidenced by the receipt.  The Master 
Landlord's, Sublessor's and Sublessee's addresses for written notices 
required to be given hereunder shall be the addresses set forth in the Basic 
Sublease Information, or at such other place designated by advance written 
notice delivered in accordance with the foregoing.


                                       8

<PAGE>

                     ARTICLE 12 - ASSIGNMENT AND SUBLETTING

     Sublessee shall not sell, assign, encumber, sublet, hypothecate or 
otherwise transfer by operation of law or otherwise this Sublease or the 
Sublessor's interest in and to the Premises (but not including any of 
Sublessee's trade fixtures or other personal property in the Premises) 
without first procuring the written consent of the Sublessor, which consent 
may be withheld in Sublessor's sole and absolute discretion.  Any such sale, 
assignment, encumbrance, sublease or other transfer in violation of the terms 
of this Sublease shall be void and shall be of no force or effect.  In the 
event Sublessor authorizes such a sublease, assignment or transfer, Sublessee 
shall remain fully liable for the Sublessee's obligations under this 
Sublease. Notwithstanding the foregoing, Sublessee shall have the right, 
after written notice to Sublessor, to assign or sublet all or any portion of 
the Premises to any entity controlling, controlled by or under common control 
with Sublessee or any successor by merger or consolidation, provided that: 
(1) the transferee agrees in writing to assume all of Sublessee's obligations 
under the Sublease, and (2) the original Sublessee shall not be released from 
any of its obligations hereunder.  

                      ARTICLE 13 - REPAIRS AND MAINTENANCE

     Sublessee shall, at Sublessee's sole expense, keep the Premises in good 
order and sanitary condition, and repair any damage thereto caused by 
Sublessee or Sublessee's agents, employees, contractors or invitees.  
Sublessee acknowledges that Sublessor is under no duty to make repairs or 
improvements to the Premises, and Sublessee hereby waives any right it may 
have at law or in equity to enforce the same.  Notwithstanding the foregoing, 
to the extent Master Landlord is obligated under the Master Lease to make any 
maintenance or repairs in or to the Premises or Building, Sublessor, upon 
written notice by Sublessee, shall diligently attempt to enforce such 
obligations of Master Landlord, provided that Sublessee reimburses Sublessor 
for all reasonable costs and expenses incurred in connection therewith.  
Notwithstanding the foregoing, if such maintenance or repairs affect the use 
and enjoyment of the Building Common Area, such costs and expenses of 
enforcement shall be paid by Sublessor and Sublessee in proportion to their 
relative interests in the Building.  

                      ARTICLE 14 - DAMAGE AND DESTRUCTION

     14.1 TERMINATION OF MASTER LEASE.  If the Premises is damaged or 
destroyed and Master Landlord exercises any option to terminate the Master 
Lease, if any, this Sublease shall terminate as of the date of the 
termination of the Master Lease.  So long as Sublessee is not in default 
under this Sublease beyond the applicable notice and cure period for such 
default on the date of such damage or destruction, Sublessee shall have the 
same rights of termination under this Sublease as Sublessor may have to 
terminate the Master Lease upon an event of damage or destruction under the 
Master Lease.  In the event Sublessee is in default under this Sublease 
beyond the applicable notice and cure period for such default on the date of 
such damage or destruction, then Sublessor shall have the right to exercise 
any termination right granted to Sublessor under Section 15 of the Master 
Lease.

     14.2 CONTINUATION OF SUBLEASE.  If the Master Lease is not terminated 
following any damage or destruction as provided above, this Sublease shall 
remain in full force and effect.  Sublessee shall be obligated to fulfill any 
repair obligations of Sublessor with respect to the Premises; provided, 
however, that (i) Sublessor shall diligently enforce any obligation of Master 
Landlord to rebuild the 


                                      9

<PAGE>

Premises in accordance with the Master Lease; (ii) Sublessor shall make 
available to Sublessee any insurance proceeds Sublessor receives as a result 
of damage or destruction of the Premises; and (iii) Sublessee shall be 
entitled to abatement of Rent on a proportionate basis (based on the degree 
to which Sublessee's use of the Premises is impaired as compared to the 
impairment of Sublessor's use of Sublessor's Premises) to the extent that 
Sublessor's Rent is abated under the Master Lease.  In the event that the 
damage cannot reasonably be repaired by the date that is 90 days prior to the 
expiration of the Term of this Sublease, then either party may terminate this 
Sublease by written notice to the other party.

                           ARTICLE 15 - CONDEMNATION

     15.1 TOTAL CONDEMNATION.  If all of the Premises are condemned by 
eminent domain, inversely condemned or sold in lieu of condemnation, for any 
public or a quasi-public use or purpose ("Condemned" or "Condemnation"), this 
Sublease shall terminate as of the date of title vesting in such proceeding, 
and Rent shall be adjusted to the date of termination.

     15.2 PARTIAL CONDEMNATION.  If any portion of the Premises is Condemned, 
and Master Landlord exercises any option to terminate the Master Lease, this 
Sublease shall automatically terminate as of the date of the termination of 
the Master Lease.  If this Sublease is not terminated following any such 
Condemnation, this Sublease shall remain in full force and effect and 
Sublessee shall promptly restore the Premises to the extent of any 
Condemnation proceeds recovered by Sublessor and made available by Sublessor 
to Sublessee for restoration, in addition, Sublessor shall diligently enforce 
any rights under the Master Lease to require Master Landlord to rebuild the 
Master Premises. Rent shall be equitably adjusted to take into account 
interference with Sublessee's ability to conduct its operations on the 
Premises as a result of the Premises being Condemned, pursuant to the terms 
and conditions of Section 14 of the Master Lease.  

     15.3 SUBLESSEE'S AWARD.  Subject to the provisions of the Master Lease, 
Sublessee shall have the right to recover from the condemning authority, such 
compensation as may be separately awarded to Sublessee in connection with 
such Condemnation proceedings.

                       ARTICLE 16 - SURRENDER OF PREMISES

     Sublessee shall peaceably surrender the Premises (including, without 
limitation, the Improvements) to Sublessor upon expiration or earlier 
termination of this Sublease, broom-clean and in as good a condition as when 
Sublessee took possession and with the Work List work completed, except for 
(i) reasonable wear and tear, (ii) loss by fire or other casualty, and (iii) 
loss by condemnation.  Sublessee shall remove Sublessee's personal property 
and, if Master Landlord, by written notice delivered to Sublessee at least 
sixty (60) days prior to the expiration of the Sublease, requires removal of 
Sublessee's lab drops from the Premises as a condition to Sublessor's 
surrender of the Building under the Master Lease (as permitted by the 
surrender provisions of the Master Lease), then Sublessee shall also remove 
such lab drops at Sublessee's cost and expense, upon the expiration or 
earlier termination of this Sublease and promptly repair all damage to the 
Premises or Building caused by such removal.

     If Sublessee abandons the Premises, any of Sublessee's personal property 
left on the Premises shall be deemed to be abandoned, and, at Sublessor's 
option, title shall pass to Sublessor under this Sublease as by a bill of 
sale. If Sublessee abandons the Premises and Sublessor elects to remove all 
or 


                                      10


<PAGE>

any part of Sublessee's personal property, the reasonable cost of removal, 
including repairing any damage to the Premises or Building caused by such 
removal, shall be paid by Sublessee.  

                           ARTICLE 17 - MISCELLANEOUS

     17.1 ENTIRE AGREEMENT.  This Sublease and the applicable portions of the 
Master Lease contained by reference herein, contain all of the covenants, 
conditions and agreements between the parties concerning the Premises, and 
shall supersede any and all prior correspondence, agreements and 
understandings concerning the Premises, both oral and written.  No addition 
or modification of any term or provision of this Sublease shall be effective 
unless set forth in writing and signed by both Sublessor and Sublessee.

     17.2 CAPTIONS.  All captions and headings in this Sublease are for the 
purposes of reference and convenience and shall not limit or expand the 
provisions of this Sublease.

     17.3 MASTER LANDLORD'S CONSENT.  This Sublease is conditioned upon 
Master Landlord's written approval of this Sublease prior to the Commencement 
Date.  If Master Landlord refuses to consent to this Sublease, then this 
Sublease shall be deemed void and of no effect, in which event the parties 
shall be discharged from all obligations hereunder and Sublessor shall return 
the Prepaid Rent, if previously delivered to Sublessor, to Sublessee; 
provided, however, that if Master Landlord acts unreasonably in withholding 
such consent, Sublessor shall reasonably attempt to enforce Sublessor's 
rights under Section 47.1 of the Master Lease.

     17.4 AUTHORITY.  Each person executing this Sublease on behalf of a 
party hereto represents and warrants that he or she is authorized and 
empowered to do so and to thereby bind the party on whose behalf he or she is 
signing.

     17.5 ATTORNEYS' FEES.  In the event either party shall bring any action 
or proceeding for damages or for an alleged breach of any provision of this 
Sublease to recover rents, or to enforce, protect or establish any right or 
remedy hereunder, the prevailing party shall be entitled to recover 
reasonable attorneys' fees and court costs as part of such action or 
proceeding.

     17.6 BROKER.  Sublessor shall be responsible for payment of any and all 
finder's fees or commissions to Shaun Burnett of Irving Hughes Group, Inc. 
("Broker") in connection with this Sublease.  Each party warrants and 
represents that it has had no dealings with any real estate broker, agent or 
finder other than Broker in connection with the negotiation of this Sublease, 
and that it knows of no other real estate broker or agent who is entitled to 
any commission or finder's fee in connection with the Premises or this 
Sublease.  Each party shall indemnify and hold the other harmless from and 
against any and all claims, demands, losses, liabilities, lawsuits, 
judgments, costs and expenses (including without limitation, attorneys' fees 
and costs) arising from any claim for a leasing commission or equivalent 
compensation alleged to be owing on account of the indemnifying party's 
dealings with any real estate broker or agent in connection with the Premises 
or this Sublease.

     17.7 COUNTERPARTS.  This Sublease may be executed in any number of 
counterparts, each of which shall be deemed to be an original and all of 
which taken together shall comprise but a single instrument.


                                       11

<PAGE>

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                                       12

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed one (1) or more 
copies of this Sublease, effective as of the Effective Date.

                              "SUBLESSOR"

                              MOLECULAR BIOSYSTEMS, INC.
                              a Delaware corporation 


                              By:    /s/ Gerard A. Wills
                                     ----------------------------
                              Name:  Gerard A. Wills
                                     ----------------------------
                              Its:   Chief Financial Officer
                                     ----------------------------


                              "SUBLESSEE"

                              DURA PHARMACEUTICALS, INC.
                              a Delaware corporation


                              By:    /s/ M.R. Woodbury
                                     -----------------------------
                              Name:  M.R. Woodbury                   
                                     -----------------------------
                              Its:   Senior Vice President        
                                     -----------------------------




              [Remainder of This Page Intentionally Left Blank]


                                       13

<PAGE>


                                   EXHIBIT A

                                  MASTER LEASE


                                           
                                      A-1

<PAGE>

                                   EXHIBIT B

                                   PREMISES






                                      B-1


<PAGE>

                                       
                                  EXHIBIT B-1

                           COMMON AREA OF FIRST FLOOR





                                      B-2

<PAGE>

                                   EXHIBIT C

                                   WORK LIST

                                [To Be Attached]





                                      C-1

<PAGE>
                                   EXHIBIT D

                                EXIT ASSESSMENT


     I.   An updated Phase I Assessment shall be prepared by an independent 
consultant and shall be  consistent with the American Society for Testing 
Materials (ASTM) Standard E-1527 and shall, by its terms, allow the following 
parties to rely upon its conclusions:  Master Landlord, Sublessor and 
Sublessee.

     II.  An Interior Site Assessment consisting of a visual inspection of 
all surfaces (floors, walls, ceiling tiles, benches, interior of cabinets, 
etc.) for signs of contamination and deterioration.  Visual inspection of all 
sinks and readily accessible drain lines for signs of deterioration, loss of 
integrity and leakage.  The Interior Site Assessment shall include detailed 
written documentation of all observations and dated photos to document the 
existing condition thereof.

     III. A Wastewater Collection System Assessment consisting of a flush and 
clean-out of all discharge piping and traps with observation of effluent 
during the clean-out and, in the event that visual observation of the 
effluent indicates degradation of the Wastewater Collection System in excess 
of normal wear for a facility of similar age and use, videotaping of the 
Wastewater Collection System along with a written report for each ten foot 
(10') piping segment. 

                                      D-1

<PAGE>

                                                                  EXHIBIT 10.48

MASTER LEASE AGREEMENT


Lessor:        MELLON US LEASING, A DIVISION OF        Lessee:
               MELLON LEASING CORPORATION
Address:       525 Market Street, Suite 3500           Address:
               San Francisco, CA 94105-2743


                           TERMS AND CONDITIONS OF LEASE

     The undersigned Lessee hereby requests Lessor to purchase the personal 
property described in any Equipment Schedule hereunder (herein called 
"Equipment") from the supplier(s) listed in any Equipment Schedule hereunder 
(herein called "Vendor" and/or "Manufacturer", as applicable) and to lease 
the Equipment to Lessee on the terms and conditions of the lease set forth 
below.

     Lessor hereby leases to Lessee, and Lessee hereby leases from 
Lessor, the Equipment upon the following terms and conditions:

     1. NO WARRANTIES BY LESSOR.  Lessee has selected the Equipment and may 
have entered into certain purchase, licensing, or maintenance agreements with 
the Vendor and/or Manufacturer (herein referred to as an "Acquisition 
Agreement") covering the Equipment as further described in Paragraph 26 
hereof.  If Lessee has entered into any Acquisition Agreement, each agreement 
shall provide for certain rights and obligations of the parties thereto with 
respect to the Equipment, and Lessee shall perform all of the obligations set 
forth in each Acquisition Agreement as if this lease did not exist.  LESSOR 
MAKES NO WARRANTY, EXPRESS OR IMPLIED, AS TO ANY MATTER WHATSOEVER, INCLUDING 
THE CONDITION OF THE EQUIPMENT, ITS MERCHANTABILITY OR ITS FITNESS FOR ANY 
PARTICULAR PURPOSE, AND, AS TO LESSOR, LESSEE LEASES THE EQUIPMENT "AS IS."  
LESSOR SHALL HAVE NO LIABILITY FOR ANY LOSS, DAMAGE OR EXPENSE OF ANY KIND 
WHATSOEVER RELATING THERETO, INCLUDING WITHOUT LIMITATION ANY SPECIAL, 
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER.

     2. CLAIMS AGAINST VENDOR AND/OR MANUFACTURER.  If the Equipment is not 
properly installed, does not operate as represented or warranted by Vendor 
and/or Manufacturer, or is unsatisfactory for any reason, Lessee shall make 
any claim on account thereof solely against Vendor and/or Manufacturer 
pursuant to the Acquisition Agreement, if any, and shall, nevertheless, pay 
Lessor all rent payable under this lease.  All warranties from Vendor and/or 
Manufacturer are, to the extent they are assignable, hereby assigned to 
Lessee for the term of the lease or until an Event of Default occurs 
hereunder, for Lessee's exercise at Lessee's expense.  Lessee may directly 
inquire with Vendor and/or Manufacturer to receive an accurate and complete 
statement of such warranties, including any disclaimers or limitations of 
such warranties or of any remedies with respect thereto.

     3. VENDOR NOT AN AGENT.  Lessee understands and agrees that neither 
Vendor, nor any sales representative or other agent of Vendor, is an agent of 
Lessor. Sales representatives or agents of Vendor, and persons that are not 
employed by Lessor (including brokers and agents) are not  authorized to 
waive or alter any term or condition of this lease, and no representation as 
to the Equipment or any other matter by Vendor or any other person that is 
not employed by Lessor (including brokers and agents) shall in any way affect 
Lessee's duty to pay the rent and perform its other obligations as set forth 
in this lease.

     4. NON-CANCELLABLE LEASE.  This lease and any Equipment Schedule hereto 
cannot be cancelled or terminated except as expressly provided herein.  
Lessee agrees that its obligation to pay all rent and other sums payable 
hereunder and the rights of Lessor in and to such rent are absolute and 
unconditional and are not subject to any abatement, reduction, setoff, 
defense, counterclaim or recoupment due or alleged to be due to, or by reason 
of, any past, present or future claims which Lessee may have against Lessor, 
any assignee, any Manufacturer or Vendor, or against any person for any 
reason whatsoever.

     5. ORDERING EQUIPMENT.  Lessee shall arrange for delivery of the 
Equipment so that it can be accepted in accordance with Paragraph 6 hereof 
within 90 days after the date on which Lessor accepts Lessee's offer to enter 
into this lease with respect to any Equipment Schedule or by such other date 
as may be set forth in an Equipment Schedule or Approval Letter issued by 
Lessor as the Approval Expiration Date.  Unless otherwise specified on the 
Equipment Schedule, Lessee shall be responsible for all transportation, 
packing, installation, testing and other charges in connection with the 
delivery, installation and

                                                                    Page 1 of 7
<PAGE>

use of the Equipment.  Lessee hereby authorizes Lessor to insert in any 
Equipment Schedule hereunder the serial numbers and other identification data 
of Equipment when determined by Lessor.

     6. ACCEPTANCE.  Lessee acknowledges that for purposes of receiving or 
accepting the Equipment from Vendor, Lessee is acting on Lessor's behalf.  
Upon delivery of the Equipment to Lessee and Lessee's inspection thereof, 
Lessee shall furnish Lessor a written statement (a) acknowledging receipt of 
the Equipment in good condition and repair and (b) accepting it as 
satisfactory in all respects for the purposes of this lease (the "Certificate 
of Acceptance"). Unless otherwise set forth in the applicable Equipment 
Schedule, the  first day of the month  following receipt and acceptance of 
the Equipment covered by an Equipment Schedule shall be the Rent Commencement 
Date therefor .  However, should Lessee have a previous lease with Lessor 
which is active at the time of acceptance of the Equipment under the 
Equipment Schedule and said lease and the current Equipment Schedule 
hereunder shall have the same invoice address then the Rent Commencement Date 
shall occur in the month immediately following acceptance of the Equipment on 
the rent payment due date established with Lessee for said previous active 
lease. Lessor is authorized to fill in on any Equipment Schedule hereunder 
the Rent Commencement Date in accordance with the foregoing.

     7. TERMINATION BY LESSOR.  If, by the Approval Expiration Date, the 
Equipment described in any Equipment Schedule has not been delivered to 
Lessee and accepted by Lessee as provided in Paragraph 6 hereof, or if other 
conditions of Lessor's Approval Letter, if any, have not been met, then 
Lessor may, at its option, terminate this lease and its obligations hereunder 
with respect to such Equipment Schedule at any time after the expiration of 
such 90 days or any date after the Approval Expiration Date, as applicable.  
Lessor shall give Lessee written notice whether or not it elects to exercise 
such option within 10 days after Lessor's receipt of Lessee's written request 
for such notice.

     8. TERM.  The term of this lease shall be comprised of an  Interim Term 
and an Initial Term.  The Interim Term shall commence on the date the 
Certificate of Acceptance is executed by Lessee (the "Acceptance Date") and 
terminate on the Rent Commencement Date.  The Initial Term of the Lease shall 
begin on the Rent Commencement Date, and shall terminate on the later of (i) 
the last day of the last month of the Initial Term (as that Term is set forth 
in the applicable Equipment Schedule hereto) or (ii) the date Lessee fulfills 
all Lessee's obligations hereunder. 

     9. RENTAL. The rental amount payable to Lessor by Lessee for the 
Equipment will be set forth in the Equipment Schedule(s) ("Rental Amount").  
As the first rent payment for the Equipment, Lessee shall pay Lessor in 
immediately available funds on the Rent Commencement Date the sum of, (i) the 
Rental Amount, and (ii) Interim Rent in an amount equal to 1/30th of the 
Rental Amount times the number of days from and including the  Acceptance 
Date through but excluding the Rent Commencement Date, and subsequent rent 
payments shall be due on the same day of each calendar period as indicated on 
the Equipment Schedule for the balance of the Initial Term.  Rent payments 
shall be due whether or not Lessee has received any notice that such payments 
are due.  All rent payments shall be paid to Lessor at its address set forth 
on the Equipment Schedule or as otherwise directed by Lessor in writing.

     10. RENEWAL.  If no default shall have occurred and be continuing, 
Lessee shall be entitled to renew the lease with respect to all, but not less 
than all, of the Equipment covered by an Equipment Schedule  for a minimum 12 
month period at an amount equal to the fair market rental value thereof,  in 
use and operational, in the condition required by the lease, payable on a 
periodic basis, as mutually agreed by Lessor and Lessee ("Renewal Rent").  
Lessee must give Lessor written notice of its intention to exercise said 
option, which notice must be received by Lessor at least 90 days before 
expiration of the Initial Term.  The first installment of the Renewal Rent 
shall be due at expiration of the Initial Term of the lease.  Should Lessee 
fail to comply with the provisions described above covering renewal, upon 
expiration of the Initial Term, the term of the lease shall be automatically 
extended for a term of 3 months.  Thereafter, the term of the lease will be 
extended for subsequent full month periods, on a month to month basis, until 
Lessee has given at least 90 days written notice terminating the lease.  Such 
termination will take effect upon completion of all Lessee's obligations 
under the lease (including payment of all periodic rental payments due during 
such 90 day period, as provided in Paragraph 9 of the lease).  At any time 
after the expiration of the Initial Term, if the lease has been automatically 
extended as set forth herein, Lessor reserves the right to terminate the 
lease by 30 days written notice to Lessee.

     11. LOCATION; INSPECTION; LABELS.  The Equipment shall be delivered to 
and shall not be removed without Lessor's prior written consent from the 
"Equipment Location" shown on the related Equipment Schedule, or if none is 
specified, Lessee's billing address shown on the Equipment Schedule.  Lessor 
shall have the right to inspect the Equipment at any reasonable time.  If 
Lessor supplies Lessee with labels stating that the Equipment is owned by 
Lessor, Lessee shall affix such labels to and keep them in a prominent place 
on the Equipment.

     12. REPAIRS; USE; ALTERATIONS.  Lessee, at its own cost and expense, shall
keep the Equipment in good repair  and working order, in the same condition as
when delivered to Lessee, reasonable wear and tear excepted, and in accordance
with

                                                                    Page 2 of 7

<PAGE>

the manufacturer's recommended specifications; shall use the Equipment 
lawfully;  shall not alter the Equipment without Lessor's prior written 
consent, shall use the Equipment in compliance with any existing 
Manufacturer's service and warranty requirements and any insurance policies 
applicable to the Equipment and shall furnish all parts and servicing 
required therefor.  All parts, repairs, additions, alterations and 
attachments placed on or incorporated into the Equipment which cannot be 
removed without damage to the Equipment shall immediately become part of the 
Equipment and shall be the property of the Lessor.  Lessee will obtain and 
maintain all permits, licenses and registrations necessary to lawfully 
operate the facility where the Equipment is located. Lessee shall comply with 
all applicable environmental and industrial hygiene laws, rules and 
regulations (including but not limited to federal, state, and local 
environmental protection, occupational, health and safety or similar laws, 
ordinances and restrictions).  Lessee shall, not later than 5 days after the 
occurrence, provide Lessor with copies of any report required to be filed 
with governmental agencies regulating environmental claims.  Lessee shall 
immediately notify Lessor in writing of any existing, pending or threatened 
investigation, inquiry, claim or action by any governmental authority in 
connection with any law, rule or regulation relating to industrial hygiene or 
environmental conditions that could affect the Equipment.

     13. MAINTENANCE.  If the Equipment is such that Lessee is not normally 
capable of maintaining it, Lessee, at its expense, shall enter into and 
maintain in full force and effect throughout the Initial Term, and any 
renewal term, Vendor and/or Manufacturer's standard maintenance contract, and 
shall comply with all its obligations thereunder.  An alternate source of 
maintenance may be used with Lessor's prior written consent.  Such consent 
shall be granted if, in Lessor's reasonable opinion, the Equipment will be 
maintained in an equivalent state of good repair, condition and working order.

     14. SURRENDER.  Provided that Lessee does not exercise the purchase 
option as set forth in Paragraph 28 hereof, upon the expiration of the 
Initial Term, or any renewal term, or upon demand by Lessor made pursuant to 
Paragraph 22 of the lease, Lessee, at its expense, shall return all, but not 
less than all, of the Equipment by delivering it to such place or on board 
such carrier, packed for shipping, as Lessor may specify.  Lessee agrees that 
the Equipment, when returned, shall be in the same condition as when 
delivered to Lessee, reasonable wear and tear excepted, and in a condition 
which will permit Lessor to be eligible for Manufacturer's standard 
maintenance contract without incurring any expense to repair or rehabilitate 
such Equipment.  Lessee shall be liable for reasonable and necessary expenses 
to place the Equipment in such condition. Lessee shall remain liable for the 
condition of the Equipment until it is received and accepted at the 
destination designated by Lessor as set forth above.  If any items of 
Equipment are missing or damaged when returned, such occurrence shall be 
treated as an event of Loss or Damage with respect to such missing or damaged 
items and shall be subject to the terms specified in Paragraph 15 below.  
Lessee shall provide Lessor with a Letter of Maintainability from the 
Manufacturer of the Equipment, which letter shall state that the Equipment 
will be eligible for the Manufacturer's standard maintenance contract when 
sold or leased to a third party.  Lessee shall give Lessor prior written 
notice that it is returning the Equipment as provided above, and such notice 
must be received by Lessor at least 90 days prior to such return.  Should 
Lessee fail to comply with the provisions described above covering surrender, 
upon expiration of the Initial Term, the term of the lease shall be 
automatically extended for a term of 3 months.  Thereafter, the term of the 
lease will be extended for subsequent full month periods, on a month to month 
basis, until Lessee has given at least 90 days written notice terminating the 
lease.  Such termination will take effect upon completion of all Lessee's 
obligations under the lease (including payment of all periodic rental 
payments due during such 90 day period, as provided in Paragraph 9 of the 
lease).  At any time after the expiration of the Initial Term, if the lease 
has been automatically extended as set forth herein, Lessor reserves the 
right to terminate the lease by 30 days written notice to Lessee.

     15. LOSS OR DAMAGE.  Lessee shall bear the entire risk of loss, theft, 
destruction of or damage to the Equipment or any item thereof (herein "Loss 
or Damage") from any cause whatsoever.  No Loss or Damage shall relieve 
Lessee of the obligation to pay rent or of any other obligation under this 
lease.  In the event of Loss or Damage, Lessee, at the option of Lessor, 
shall:  (a) place the same in good condition and repair; (b) replace the same 
with like equipment acceptable to Lessor in good condition and repair with 
clear title thereto in Lessor; or (c) pay to Lessor the total of the 
following amounts:  (i) the total rent and other amounts due and owing at the 
time of such payment, plus (ii) an amount calculated by Lessor which is the 
present value at 5% per annum simple interest discount of all rent and other 
amounts payable by Lessee with respect to said item from date of such payment 
to date of expiration of its Initial Term, plus (iii) the "reversionary 
value" of the Equipment, which shall be determined by Lessor as the total 
cost of the Equipment less 60% of the total rent (net of sales/use taxes, if 
any) required to be paid pursuant to Paragraph 9.  Upon Lessor's receipt of 
such payment, Lessee and/or Lessee's insurer shall be entitled to Lessor's 
interest in said item, for salvage purposes, in its then condition and 
location, "as-is", without any warranty, express or implied.

     16. INSURANCE.  Lessee shall provide, maintain and pay for (a) all risk 
property insurance against the loss or theft of or damage to the Equipment, 
for the full replacement value thereof, naming Lessor as a loss payee, and 
(b) commercial general liability insurance (and if Lessee is a doctor, 
hospital or other health care provider, medical malpractice insurance).  All 
such policies shall name Lessor as an additional insured and shall have 
combined single limits in amounts acceptable to Lessor.  All such insurance 
policies shall be endorsed to be primary and non-contributory to any policies 
maintained by Lessor.  In addition Lessee shall cause Lessor to be named as 
an additional insured on any excess or umbrella policies purchased by Lessee. 
A copy of each paid-up policy evidencing such insurance (appropriately 
authenticated by the insurer) or a certificate of the insurer providing such 

                                                                    Page 3 of 7

<PAGE>

coverage proving that such policies have been issued, providing the coverage 
required hereunder shall be delivered to Lessor prior to the Rent 
Commencement Date.  All insurance shall be placed with companies satisfactory 
to Lessor and shall contain the insurer's agreement to give 30 days written 
notice to Lessor before cancellation or any material change of any policy of 
insurance.

     17. TAXES.  Lessee shall reimburse to Lessor (or pay directly if, but 
only if, instructed by Lessor) all charges and taxes (local, state and 
federal) which may now or hereafter be imposed or levied upon the sale, 
purchase, ownership, leasing, possession or use of the Equipment; excluding, 
however, all income taxes levied on (a) any rental payments made to Lessor 
hereunder, (b) any payment made to Lessor in connection with Loss or Damage 
to the Equipment under Paragraph 15 hereof, or (c) any payment made to Lessor 
in connection with Lessee's exercise of its purchase option under Paragraph 
28 hereof. 

     18. LESSOR'S PAYMENT.  If Lessee fails to provide or maintain said 
insurance, to pay said taxes, charges and fees, or to discharge any levies, 
liens and encumbrances created by Lessee, Lessor shall have the right, but 
shall not be obligated, to obtain such insurance, pay such taxes, charges and 
fees, or effect such discharge.  In that event, Lessee shall remit to Lessor 
the cost thereof with the next rent payment.

     19. INDEMNITY. (a) GENERAL INDEMNITY.  Lessee shall indemnify Lessor 
against and hold Lessor harmless from any and all claims, actions, damages, 
costs, expenses including reasonable attorneys' fees, obligations, 
liabilities and liens (including any of the foregoing arising or imposed 
under the doctrines of "strict liability" or "product liability" and 
including without limitation the cost of any fines, remedial action, damage 
to the environment and cleanup and the fees and costs of consultants and 
experts), arising out of the manufacture, purchase, lease, ownership, 
possession, operation, condition, return or use of the Equipment, or by 
operation of law, excluding however, any of the foregoing resulting from the 
gross negligence or willful misconduct of Lessor.  Lessee agrees that upon 
written notice by Lessor of the assertion of such a claim, action, damage, 
obligation, liability or lien, Lessee shall assume full responsibility for 
the defense thereof.  Lessee's choice of counsel shall be mutually acceptable 
to both Lessee and Lessor.  This indemnity also extends to any environmental 
claims arising out of or relating to prior acts or omissions of any party 
whatsoever.  The provisions of this paragraph shall survive termination of 
this lease with respect to events occurring prior to such termination.

     (b) TAX INDEMNITY.  Lessee acknowledges that Lessor shall be entitled to 
all tax benefits of ownership with respect to the Equipment (the "Tax 
Benefits"), including but not limited to, (i) the accelerated cost recovery 
deductions determined in accordance with Section 168(b)(1) of the Internal 
Revenue Code of 1986 for the Equipment based on the original cost of the 
Equipment to Lessor (ii) deductions for interest on any indebtedness incurred 
by Lessor to finance the Equipment and (iii) sourcing of income and losses 
attributable to this lease to the United States.  Lessee represents that the 
Equipment shall be depreciable for Federal tax purposes utilizing the MACRS 
Recovery Period as set forth in the Equipment Schedule, with such 
depreciation commencing as of the date of Equipment acceptance by Lessee as 
set forth on the Certificate of Acceptance.  Lessee agrees to take no action 
inconsistent with the foregoing or any action which would result in the loss, 
disallowance or unavailability to Lessor of all or any part of the Tax 
Benefits.  Lessee hereby indemnifies and holds harmless Lessor and its 
assigns from and against (i) the loss, disallowance, unavailability or 
recapture of all or any part of the Tax Benefits resulting from any action, 
statement, misrepresentation or breach of warranty or covenant by Lessee of 
any nature whatsoever including but not limited to the breach of any 
representations, warranties or covenants contained in this paragraph, plus 
(ii) all interest, penalties, fines or additions to tax resulting from such 
loss, disallowance, unavailability or recapture, plus (iii) all taxes 
required to be paid by Lessor upon receipt of the indemnity set forth in this 
paragraph.  Any payments made by Lessee to reimburse Lessor for lost Tax 
Benefits shall be calculated (i) on the assumption that Lessor is subject to 
the maximum Federal Corporate Income Tax with respect to each year and that 
all Tax Benefits are currently utilized, and (ii) without regard to whether 
Lessor or any members of a consolidated group of which Lessor is also a 
member is then subject to any increase in tax as a result of the loss of Tax 
Benefits.  For the purposes of this paragraph, "Lessor" includes for all tax 
purposes the consolidated taxpayer group of which Lessor is a part.

     (c)  PAYMENT.  The amounts payable pursuant to this Paragraph 19 shall 
be payable upon demand of Lessor, accompanied by a statement describing in 
reasonable detail such claim, action, damage, cost, expense, fee, obligation, 
liability, lien or tax and setting forth the computation of the amount so 
payable, which computation shall be binding and conclusive upon Lessee, 
absent manifest error.  The indemnities and assumptions of liabilities and 
obligations contained in this Paragraph 19 shall continue in full force and 
effect notwithstanding the expiration or other termination of this Lease.
 
     20. ASSIGNMENT.  Without Lessor's prior written consent, Lessee shall 
not assign, transfer, pledge, hypothecate or otherwise dispose of this lease, 
the Equipment, or any interest therein.  Without Lessor's prior written 
consent, Lessee shall not sublet or lend the Equipment or permit it to be 
used by anyone other than Lessee or Lessee's employees. Lessor may assign 
this lease in whole or in part without notice to Lessee.  If Lessee is given 
notice of such assignment it agrees to acknowledge receipt thereof in 
writing.  Each such assignee shall have all of the rights, but none of the 
obligations, of Lessor under this lease.  Lessee shall not assert against 
assignee any defense, counterclaim or offset that Lessee may have against 
Lessor.  Notwithstanding any

                                                                    Page 4 of 7

<PAGE>

such assignment, Lessor warrants that Lessee shall quietly enjoy use of the 
Equipment subject to the terms and conditions of this lease so long as Lessee 
is not in default hereunder.  Subject to the foregoing, this lease inures to 
the benefit of and is binding upon the successors and assigns of the parties 
hereto.

     21. DELINQUENT PAYMENTS.  (a) Service Charge.  Since it would be 
impractical or extremely difficult to fix Lessor's actual damages for 
collecting and accounting for a late payment, if any payment to Lessor 
required herein (including, but not limited to, rental, renewal, tax, 
purchase and other amounts) is not paid on or before its due date, Lessee 
shall pay to Lessor an amount equal to 5% of any such late payment.  (b)  
Interest.  Lessee shall also pay interest on any such late payment from the 
due date thereof until the date paid at the lesser of 18% per annum or the 
maximum rate allowed by law.

     22. DEFAULT; REMEDIES.  Any of the following shall constitute an Event 
of Default:  If a) Lessee fails to pay when due any rent or other amount 
required herein to be paid by Lessee, or b) Lessee makes an assignment for 
the benefit of creditors, whether voluntary or involuntary, or c) a petition 
is filed by or against Lessee under any bankruptcy, insolvency or similar 
legislation, or d) Lessee violates or fails to perform any provision of 
either this lease or any Acquisition Agreement, or violates or fails to 
perform any covenant or representation made by Lessee herein, or e) Lessee 
makes a bulk transfer of furniture, furnishings, fixtures or other equipment 
or inventory, or f) Lessee ceases doing business as a going concern or 
terminates its existence, or (g) Lessee consolidates with, merges with or 
into, or conveys or leases all or substantially all of its assets as an 
entirety to any person or engages in any other form of reorganization, or 
there is a change in the legal structure of Lessee, in each case which 
results, in the opinion of Lessor, in a material adverse change in Lessee's 
ability to perform its obligations under this lease, or (h) any 
representation or warranty made by Lessee in this lease or in any other 
document or agreement furnished by Lessee to Lessor shall prove to have been 
false or misleading in any material respect when made or when deemed to have 
been made, or i) Lessee shall be in default under any material obligation for 
the payment of borrowed money or the deferred purchase price of, or for the 
payment of any rent due with respect to, any real or personal property, or j) 
Lessee shall be in default under any other agreement now existing or 
hereafter made with Lessor or any of Lessor's affiliates, or k) any event or 
condition described in the foregoing clauses (b), (c), (e), (f), (g) (h) (in 
clauses (g) and (h) substituting the phrase "guaranty or other credit support 
document" for the word "lease"), (i) or (j) shall have occurred with respect 
to any guarantor of, or other party liable in whole or in part for, Lessee's 
obligations hereunder, or such guarantor or other party shall have defaulted 
in the observance or performance of any covenant, condition or agreement to 
be observed or performed by it under the guaranty or other credit support 
document pursuant to which it is liable for Lessee's obligations hereunder, 
or such guaranty or other credit support document shall have been revoked or 
terminated or shall have otherwise ceased, for any reason, to be in full 
force and effect.  An Event of Default with respect to any Equipment Schedule 
shall constitute an Event of Default for all Equipment Schedules.  Lessee 
shall promptly notify Lessor of the occurrence of any Event of Default.

     If an Event of Default occurs, Lessor shall have the right to exercise 
any one or more of the following remedies in order to protect the interests 
and reasonably expected profits and bargains of Lessor:  a) Lessor may 
terminate this lease with respect to all or any part of the Equipment, b) 
Lessor may recover from Lessee all rent and other amounts then due and as 
they shall thereafter become due hereunder, c) Lessor may take possession of 
any or all items of Equipment, wherever the same may be located, without 
demand or notice, without any court order or other process of law and without 
liability to Lessee for any damages occasioned by such taking of possession, 
and any such taking of possession shall not constitute a termination of this 
lease, d) Lessor may recover from Lessee, with respect to any and all items 
of Equipment, and with or without repossessing the Equipment the sum of (1) 
the total amount due and owing to Lessor at the time of such default, plus 
(2) an amount calculated by Lessor which is the present value at 5% per annum 
simple interest discount of all rent and other amounts payable by Lessee with 
respect to said item(s) from date of such payment to date of expiration of 
its Initial Term, plus (3) the "reversionary value" of the Equipment, which 
shall be determined by Lessor as the total cost of the Equipment less 60% of 
the total rent (net of sales/use taxes, if any) required to be paid pursuant 
to Paragraph 9, and which the parties agree is a reasonable estimate of such 
value; and upon the payment of all amounts described in clauses (1), (2) and 
(3) above, Lessee will become entitled to the Equipment AS IS, WHERE IS, 
without warranty whatsoever; provided, however, that if Lessor has 
repossessed or accepted the surrender of the Equipment, Lessor shall sell, 
lease or otherwise dispose of the Equipment in a commercially reasonable 
manner, with or without notice and on public or private bid, and apply the 
net proceeds thereof (after deducting all expenses, including attorneys' fees 
incurred in connection therewith), to the sum of (1), (2) and (3) above, and 
e) Lessor may pursue any other remedy available at law or in equity, 
including but not limited to seeking damages or specific performance and/or 
obtaining an injunction.

     No right or remedy herein conferred upon or reserved to Lessor is 
exclusive of any right or remedy herein or by law or equity provided or 
permitted; but each shall be cumulative of every other right or remedy given 
hereunder or now or hereafter existing at law or in equity or by statute or 
otherwise, and may be enforced concurrently therewith or from time to time, 
but Lessor shall not be entitled to recover a greater amount in damages than 
Lessor could have gained by receipt of Lessee's full, timely and complete 
performance of its obligations pursuant to the terms of this lease plus 
accrued delinquent payments under Paragraph 21.

                                                                    Page 5 of 7

<PAGE>

     23. LESSOR'S EXPENSE.  Lessee shall pay Lessor all costs and expenses, 
including attorneys' fees and the fees of collection agencies, incurred by 
Lessor in enforcing any of the terms, conditions, or provisions hereof or in 
protecting Lessor's rights herein.  Lessee's obligation hereunder includes 
all such costs and expenses expended by Lessor (a) prior to filing of an 
action, (b) in connection with an action which is dismissed, and (c) in the 
enforcement of any judgment.  Lessee's obligation to pay Lessor's attorneys' 
fees incurred in enforcing any judgment is a separate obligation of Lessee, 
severable from Lessee's other obligations hereunder, which obligation will 
survive such judgment and will not be deemed to have been merged into such 
judgment.

     24. OWNERSHIP; PERSONAL PROPERTY.  The Equipment shall at all times 
remain the property of Lessor and Lessee shall have no right, title or 
interest therein or thereto except as expressly set forth in this lease and 
the Equipment shall at all times be and remain personal property 
notwithstanding that the Equipment or any part thereof may now be, or 
hereafter become, in any manner, affixed or attached to real property or any 
improvements thereon.

     25. NOTICES.  Service of all notices under this lease shall be 
sufficient if given personally or mailed to the respective party at its 
address set forth on any Equipment Schedule, or at such address as either 
party may provide in writing from time to time.  Any such notice mailed to 
said address shall be effective when deposited in the United States mail, 
duly addressed and with postage prepaid.

     26. ACQUISITION AGREEMENTS.  If the Equipment is subject to any 
Acquisition Agreement, Lessee, as part of this lease, transfers and assigns 
to Lessor all of its rights, but none of its obligations (except for Lessee's 
obligation to pay for the Equipment conditioned upon Lessee's acceptance in 
accordance with Paragraph 6), in and to the Acquisition Agreement, including 
but not limited to the right to take title to the Equipment.  Lessee shall 
indemnify and hold Lessor harmless in accordance with Paragraph 19 from any 
liability resulting from any Acquisition Agreement as well as liabilities 
resulting from any Acquisition Agreement Lessor is required to enter into on 
behalf of Lessee or with Lessee for purposes of this lease.

     27. UPGRADES.  Any existing lease between Lessor and Lessee subject to 
an "upgrade" program shall continue in full force and effect and shall be 
kept free of default by Lessee (even if the Equipment covered by the existing 
lease is sold, traded-in, etc.) until any such existing lease is cancelled by 
Lessor when, if applicable, the new Equipment is accepted by Lessee for all 
purposes of this lease.

     28. PURCHASE OPTION.  If no default shall have occurred and be 
continuing, Lessee shall be entitled, at its option upon written notice to 
Lessor, which notice must be received by Lessor at least 90 days prior to the 
end of either the Initial Term or any renewal term of any Equipment Schedule, 
to purchase all, but not less than all, of the Equipment covered by such 
Equipment Schedule from Lessor at the end of the Initial Term or any renewal 
term for such Equipment Schedule at a purchase price equal to the then fair 
market value of the Equipment in use and operational, in the condition 
required by the lease, as mutually agreed by Lessor and Lessee.  On a date 
which is no later than the expiration date of the Initial Term or any renewal 
term, as applicable, Lessee shall pay to Lessor the purchase price for the 
Equipment covered by such Equipment Schedule (plus any taxes levied thereon) 
and Lessor shall sell the Equipment "as-is where-is" without any warranties 
express or implied.

     29. RELATED EQUIPMENT SCHEDULES.  In the event that any Equipment 
Schedule hereunder shall include Equipment that may become attached to, 
affixed to, or used in connection with Equipment covered under another 
Equipment Schedule hereunder ("Related Equipment Schedule"), Lessee 
acknowledges the following: (a) if Lessee elects to exercise a purchase 
option or renewal option under any Equipment Schedule, if provided; or (b) if 
Lessee elects to return the Equipment under any Equipment Schedule as 
described in Paragraph 14, then Lessor, at its discretion, may require the 
similar disposition of all Related Equipment Schedules as provided for by 
this lease.

     30. MISCELLANEOUS.  This instrument and any Approval Letter issued by 
Lessor and any Equipment Schedule hereunder constitutes the entire agreement 
between Lessor and Lessee, and shall not be amended, altered or changed 
except by a written agreement signed by the parties hereto, and in the case 
of Lessor, such agreement shall not be valid unless executed by Lessor at 
Lessor's home office.  To the extent any provision of this lease may be 
determined to be invalid or unenforceable, it shall be ineffective without 
affecting the other provisions of this lease.  To the extent permitted by 
applicable law, Lessee hereby waives any provisions of law which render any 
provision of this lease unenforceable in any respect.  Unless specified 
otherwise, in the event such written agreement is attached to and made a part 
of an Equipment Schedule, the terms and conditions of said written agreement 
shall apply only to said Equipment Schedule and shall not apply to any other 
Equipment Schedule made a part of this lease.  In the event Lessee issues a 
purchase order to Lessor covering Equipment to be leased hereunder, it is 
agreed that such purchase order is issued for purposes of authorization and 
Lessee's internal use only, and none of its terms and conditions shall modify 
the terms and conditions of this lease and/or related documentation, or 
affect Lessor's responsibility to Lessee as defined in this lease.  An 
executed Equipment Schedule that incorporates by reference the terms of this 
Master Lease Agreement, marked "Original," shall be the original of the lease 
for the Equipment described therein for all purposes. All other executed 
counterparts

                                                                    Page 6 of 7

<PAGE>

of the lease shall be marked "Duplicate."  To the extent the lease 
constitutes chattel paper, as such term is defined in the Uniform Commercial 
Code of the applicable jurisdiction, no security interest in the lease may be 
created through the transfer of possession of any counterpart other than the 
Original of the lease.  Lessor reserves the right to charge Lessee fees for 
its provision of additional administrative services related to the lease 
requested by Lessee.  Lessee shall provide Lessor with such corporate 
resolutions, opinions of counsel, financial statements, and other documents 
(including documents for filing or recording) as Lessor may request from time 
to time.  LESSEE HEREBY APPOINTS LESSOR OR ITS ASSIGNEE ITS TRUE AND LAWFUL 
ATTORNEY IN FACT TO EXECUTE ON BEHALF OF LESSEE ALL UNIFORM COMMERCIAL CODE 
FINANCING STATEMENTS OR OTHER DOCUMENTS WHICH, IN LESSOR'S DETERMINATION, ARE 
NECESSARY TO SECURE LESSOR'S INTEREST IN SAID EQUIPMENT.  The filing of UCC 
Financing Statements is precautionary and shall not be evidence that the 
lease is intended as security.  If for any reason this agreement is 
determined not to be a lease, Lessee hereby grants Lessor a security interest 
in the lease, the Equipment or collateral pertaining thereto and the proceeds 
thereof, including re-lease, sale or disposition of the Equipment or other 
collateral.  If more than one Lessee is named in this lease, the liability of 
each shall be joint and several.  Time is of the essence with respect to this 
lease.  Lessee represents and warrants that the Equipment is being leased 
hereunder for business purposes. The descriptive headings which are used in 
this lease are for convenience of the parties only and shall not affect the 
meaning of any provision of the lease. Any failure of the Lessor to require 
strict performance by the Lessee or any waiver by Lessor of any provision 
herein shall not be construed as a consent or waiver of any other breach of 
the same or of any other provision.  This agreement shall be governed by the 
laws of the state of California (without giving effect to principles of 
conflicts of law thereof).

     31.  LESSEE'S REPRESENTATIONS; WAIVER OF JURY TRIAL.  Lessee represents 
and warrants, as of the date of this lease:  (a) Lessee is duly organized, 
validly existing and in good standing under the laws of the state of its 
incorporation or organization, and is duly qualified to do business wherever 
necessary to carry on its present business and operations and to own its 
property; (b) this lease (and any Equipment Schedule entered into pursuant to 
this lease) has been duly authorized by all necessary action on the part of 
Lessee, duly executed and delivered by authorized officers or agents of 
Lessee, does not require any further shareholder or partner approval, does 
not require the approval of, or the giving notice to, any federal, state, 
local or foreign governmental authority, does not contravene any law binding 
on Lessee or contravene any certificate or articles of incorporation or 
by-laws or partnership certificate or agreement, or any agreement, indenture 
or other instruments to which Lessee is a party or by which it or any of its 
assets or property may be bound; (c) this lease (and any Equipment Schedule 
entered into pursuant to this lease) constitutes the legal, valid and binding 
obligation of Lessee and is enforceable in accordance with its terms; (d) all 
credit and financial information, and all other information submitted to 
Lessor at any time is true and correct, and there does not exist any pending 
or threatened action or proceeding before any court or administrative agency 
which might materially adversely affect Lessee's financial condition or 
operations; (e) Lessee agrees to furnish to Lessor (i) as soon as available, 
and in any event within 120 days after the last day of each fiscal year of 
Lessee, a copy of the financial statements of Lessee as of the end of such 
fiscal year, certified by an independent certified public accounting firm; 
(ii) as soon as available, and in any event within 60 days after the last day 
of each quarter of Lessee's fiscal year, a copy of quarterly financial 
statements certified by the principal financial officer of Lessee; and (iii) 
such additional information concerning Lessee as Lessor may reasonably 
request. LESSEE AND LESSOR HEREBY WAIVE THE RIGHT TO TRIAL BY JURY OF ANY 
MATTERS ARISING OUT OF THIS LEASE OR ANY OTHER AGREEMENT EXECUTED IN 
CONNECTION HEREWITH.

     32. GOOD FAITH DEPOSIT REQUIREMENT.  Lessee agrees, with respect to each 
transaction, to pay the Good Faith Deposit specified in Lessor's proposal for 
such transaction or in the Equipment Schedule related thereto.  This Good 
Faith Deposit is given in consideration for Lessor's costs and expenses in 
investigating and appraising and/or establishing credit for Lessee.  This 
Good Faith Deposit shall not be refunded unless Lessor declines to accept 
Lessee's offer to enter into the lease.  Upon Lessor's acceptance of Lessee's 
offer to enter into the lease, unless otherwise specified in the proposal or 
Equipment Schedule, the amount shall be applied to the first period's rent 
payment. Lessee acknowledges that Lessor's act of depositing any Good Faith 
Deposit into Lessor's bank account shall not in itself constitute Lessor's 
acceptance of Lessee's offer to enter into the lease.

IN WITNESS WHEREOF, the parties have executed this Master Lease Agreement 
effective as of the first date it is executed by Lessee below. 

<TABLE>

<S>                                             <C>                                                 <C>
MELLON US LEASING, A DIVISION OF                LESSEE . . . .                                      DATE
MELLON LEASING CORPORATION (LESSOR)
BY                                              BY   /s/ Elizabeth L. Hougen      Controller        9/29/97
- ------------------------------------------      ----------------------------------------------    -----------
TITLE                                           BY                                  TITLE

- ------------------------------------------      ----------------------------------------------    -----------
HOME OFFICE: 525 MARKET STREET, SUITE 3500      CO-LESSEE . . . .                                    DATE
SAN FRANCISCO, CA  94105-2743                   BY                                  TITLE
NOT VALID UNLESS EXECUTED BY LESSOR AT LESSOR'S 
HOME OFFICE                                     ----------------------------------------------    -----------

</TABLE>

                                                                    Page 7 of 7


<PAGE>

                                                                  EXHIBIT 10.49

                                SUBLEASE (BUILDING #3)

     This Sublease is made as of February 16, 1997, by and between ComStream
Corporation, a Delaware corporation ("Sublessor"), and Molecular Biosystems,
Inc., a Delaware corporation ("Subtenant"), with respect to the approximately
30,097 square-foot building located at 10070 Barnes Canyon Road in San Diego,
California, as depicted in the attached Exhibit "A" (the "Property").
     
     1.  LEASING AND TERM.  Subject to the conditions set forth below, Sublessor
leases to Subtenant, and Subtenant hires from Sublessor, the Property for the
term (the "Term") commencing on March 1, 1998 and expiring on February 14, 2000
(the "Expiration Date"), unless earlier terminated in accordance with this
Sublease; provided, however, Tenant may not take possession of the 10,295
square-foot portion of laboratory within the Property depicted as Space "B" on
the attached EXHIBIT "B" until April 16, 1998.  
     
     2.  MASTER LEASE.  Sublessor's interest in the Property is held under the
Triple Net Lease (Single Tenant Building) dated as of May 31, 1989, by and
between K L Sorrento Associates, predecessor-in-interest to Spieker Properties
("Master Lessor"), as landlord, and Sublessor, as tenant, as amended by the 1st
Amendment to Lease dated as of May 31, 1989, the Second Amendment to Lease dated
as of April 1, 1991, the Third Amendment to Lease dated as of February 15, 1994,
and the Fourth Amendment to Lease dated as of February 24, 1995 (the "Master
Lease"), a copy of which is attached to this Sublease as EXHIBIT C (along with
certain material correspondence and estoppel certificates).  This Sublease is a
sublease under and subject and subordinate to the terms and conditions of the
Master Lease.  Subtenant may not violate any provision of the Master Lease.  The
following provisions of the Master Lease are repeated and incorporated into this
Sublease as if originally set forth in this Sublease, but substituting each
instance of the word "Lessor" with "Sublessor", each instance of "Lessee" with
"Subtenant" and each instance of "Premises" with "Property":  Sections 4.2, 6.1,
7, 8.2, and 8.3, and Articles 11 through 27, 29, 33 through 43, and 46 through
50 (except that in Section 50.5, the reference to "40.54 percent" is replaced
with "32.2 percent"); as well as Article 11 of the Second Amendment to Lease,
and Articles 7, 8, 10, 12, and 13 of the Third Amendment to Lease.  If the
Master Lease is terminated, then this Sublease is automatically terminated on
the same date of such termination and Sublessor has no further obligations under
this Sublease other than to return any unearned paid rent to Subtenant.  The
obligation of Sublessor under this Sublease is expressly conditioned upon
Sublessor obtaining Master Lessor's written consent to this Sublease.

     3.  RENT.  Subtenant shall pay Sublessor as basic monthly rent under this
Sublease, excluding triple net charges, in advance, $28,592.15, except that
basic monthly rent for the first two month period of March 1, 1998 through April
30, 1998 is only $42,514.00, half of which is immediately payable, the other
half of which is due on April 1, 1998.  On March 1, 1999, and for the remainder
of the Term, basic monthly rent increases to $29,449.91.  In order to facilitate
Sublessor paying its obligations under the Master Lease in a timely fashion, all
payments required of Subtenant under this Sublease are due, and must be paid,
five business days before they are due from Sublessor under the Master Lease.  
     
     4.  SECURITY DEPOSIT AND SECURITY INTEREST.  Subtenant shall immediately
deposit with Sublessor cash in the amount of $28,592.15 (the "Security Deposit")
to secure the performance by Subtenant of its obligations under this Sublease,
including Subtenant's obligations (i) to pay rent, (ii) to repair damages caused
by Subtenant or Subtenant's agents, employees, contractors, licensees, or
invitees (collectively, "Subtenant's Invitees"), (iii) to clean the Premises on
the termination of this Sublease, and (iv) to remedy any other defaults by
Subtenant in the performance of any of its obligations under this 


                                       1

<PAGE>

Sublease. Subtenant shall promptly pay to Sublessor the amount necessary to 
replenish any portion of the Security Deposit so used by Sublessor.  
Following the Expiration Date or earlier termination of this Sublease, and 
within the time frame required by applicable law, Sublessor shall deliver to 
Subtenant, at Subtenant's last known address, any portion of the Security 
Deposit not used by Sublessor in accordance with this paragraph, along with 
an itemized statement of deductions made from the Security Deposit.  
Sublessor may commingle the Security Deposit with Sublessor's other funds and 
Sublessor will not pay interest on such Security Deposit to Subtenant. 

     5.  SECURITY MEASURES.  Subtenant acknowledges (i) that the rent does not
include the cost of any security measures for any portion of the Project (ii)
that Sublessor has no obligation to provide any security measures, (iii) that
Sublessor has made no representation to Subtenant regarding the safety or
security of the Project, and (iv) that Subtenant is solely responsible for
providing any security it deems necessary to protect itself, its property, and
Subtenant's invitees in, on, or about the Project.

     6.  "AS IS" CONDITION OF PROPERTY.  Subtenant has inspected the Property to
the extent it deems appropriate and hereby accepts the Property in its "AS IS"
condition or status as of the date of this Sublease and acknowledges that in
doing so it has relied solely on Subtenant's inspection of the Property, its
analysis of the Master Lease and Master Lessor and the opinions and advice
concerning the Premises of consultants engaged by Subtenant.  Subtenant
acknowledges that Sublessor has made no representation or warranty regarding the
Property or the Master Lease or any other matter whatsoever relating to this
Sublease or the Property, and Sublessor disclaims any implied representation or
warranty.

     7.  BROKERS.  Subtenant and Sublessor each represents that no real estate
broker, agent, finder, or other person is responsible for bringing about or
negotiating this Sublease and Subtenant has not dealt with any real estate
broker, agent, finder, or other person, relative to this Sublease in any manner,
other than CB Commercial and The Irving Hughes Group, Inc.  Sublessor is
responsible for paying CB Commercial's commission of $35,025.00, which is to be
split evenly between CB Commercial and The Irving Hughes Group, Inc.

     8.  NOTICES.  Each notice and other communication required or permitted to
be given under this Agreement ("Notice") must be in writing.  Notice is duly
given to another party upon:  (a) hand delivery to the other party, (b) receipt
by the other party when sent by facsimile to the address and number for such
party set forth below (provided, however, that the Notice is not effective
unless a duplicate copy of the facsimile Notice is promptly given by one of the
other methods permitted under this paragraph), (c) three business days after the
Notice has been deposited with the United States postal service as first class
certified mail, return receipt requested, postage prepaid, and addressed to the
party as set forth below, or (d) the next business day after the Notice has been
deposited with a reputable overnight delivery service, postage prepaid,
addressed to the party as set forth below with next-business-day delivery
guaranteed, provided that the sending party receives a confirmation of delivery
from the delivery-service-provider.

If To Sublessor:              ComStream Corporation
                              10180 Barnes Canyon Road
                              San Diego, CA 92121
                              Facsimile:  (619) 657-5702
                              Attn:  General Counsel 

  with a copy to:             Solomon Ward Seidenwurm & Smith, LLP
                              401 B Street, Suite 1200
                              San Diego, CA 92101


                                       2

<PAGE>

                              Attn:  Jeffrey A. Schneider, Esq.
                              Facsimile:  (619) 231-4755

If To Subtenant:              Molecular Biosystems, Inc. 
                              10030 Barnes Canyon Road
                              San Diego, CA 92121
                              Attn:  Gerard A. Wills
                              Facsimile:   (619) 824-2395

Each party shall make a reasonable, good faith effort to ensure that it will
accept or receive Notices to it that are given in accordance with this
paragraph.  A party may change its address for purposes of this paragraph by
giving the other party(ies) written notice of a new address in the manner set
forth above.
     
     9.  MISCELLANEOUS.  This Sublease may be executed in counterparts, each of
which is deemed an original and all of which together constitute one document. 
All exhibits attached to and referenced in this Sublease are incorporated into
this Sublease.  This Sublease may be modified only by a contract in writing
executed by the party to this Sublease against whom enforcement of the
modification is sought.  This Sublease and all documents specifically referred
to and executed in connection with this Sublease:  (a) contain the entire and
final agreement of the parties to this Sublease with respect to the subject
matter of this Sublease, and (b) supersede all negotiations, stipulations,
understandings, agreements, representations and warranties, if any, with respect
to such subject matter, which precede or accompany the execution of this
Sublease.  Whenever the context so requires in this Sublease, all words used in
the singular may include the plural (and vice versa) and the word "person"
includes a natural person, a corporation, a firm, a partnership, a joint
venture, a trust, an estate or any other entity.  The terms "includes" and
"including" do not imply any limitation.  No remedy or election under this
Sublease is exclusive, but rather, to the extent permitted by applicable law,
each such remedy and election is cumulative with all other remedies at law or in
equity.  Each party to this Sublease and its legal counsel have reviewed and
revised this Sublease.  The rule of construction that ambiguities are to be
resolved against the drafting party or in favor of the party receiving a
particular benefit under an agreement may not be employed in the interpretation
of this Sublease or any amendment to this Sublease.  Nothing in this Sublease is
intended to confer any rights or remedies on any person or entity other than the
parties to this Sublease and their respective successors-in-interest and
permitted assignees.


SUBLESSOR:                 COMSTREAM CORPORATION, a Delaware corporation


                           By:  /s/Jamie Crichton                      
                                -------------------------------
                                its:  Vice President & CFO   

SUBTENANT:                 MOLECULAR BIOSYSTEMS, INC., a Delaware 
                           corporation
                              

                           By:  /s/ Thomas E. Jurgensen
                                -------------------------------
                                its: Vice President - Legal and General Counsel


                                       3

<PAGE>




                                     EXHIBIT A


                             THE PROPERTY - BUILDING #3





                                       4


<PAGE>


                                     EXHIBIT B

                                    MASTER LEASE





                                       5




<PAGE>

                                                                   EXHIBIT 23.1


                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the incorporation of 
our report included in this Form 10-K, into the Company's previously filed 
Registration Statements, File Numbers 33-723, 33-24508, 33-78564, 33-78572 
and 333-02389.



                                                          ARTHUR ANDERSEN LLP

San Diego, California
May 18, 1998


<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED FINANCIAL STATEMENTS OF MOLECULAR BIOSYSTEMS, INC. DATED
MARCH 31, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK>  0000719598 
<NAME> MOLECULAR BIOSYSTEMS, INC.
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          MAR-31-1998
<PERIOD-START>                             APR-01-1997
<PERIOD-END>                               MAR-31-1998
<CASH>                                           1,064
<SECURITIES>                                    20,274
<RECEIVABLES>                                    1,498
<ALLOWANCES>                                         3
<INVENTORY>                                      1,902
<CURRENT-ASSETS>                                33,638
<PP&E>                                          19,247
<DEPRECIATION>                                   7,073
<TOTAL-ASSETS>                                  51,318
<CURRENT-LIABILITIES>                           12,572
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           178
<OTHER-SE>                                      30,986
<TOTAL-LIABILITY-AND-EQUITY>                    51,318
<SALES>                                          1,151
<TOTAL-REVENUES>                                 6,246
<CGS>                                            5,791
<TOTAL-COSTS>                                   28,781
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 721
<INCOME-PRETAX>                               (21,260)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (21,260)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (21,260)
<EPS-PRIMARY>                                   (1.19)
<EPS-DILUTED>                                   (1.19)
        

</TABLE>


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