SOMATOGEN INC
10-K, 1997-09-11
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE> 1
SOMATOGEN, INC.
=============================================================

               SECURITIES AND EXCHANGE COMMISSION
                       Washington, D.C. 20549

                              FORM 10-K

     /X/   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF
                 THE SECURITIES EXCHANGE ACT OF 1934

               For the fiscal year ended June 30, 1997
                    Commission file number 0-19423

                                 OR

     / /  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF
                  THE SECURITIES EXCHANGE ACT OF 1934
        For the transition period from __________ to ____________

                                Somatogen, Inc.
             (Exact name of registrant as specified in its charter)

                  Delaware                           84-0991858
        (State or other jurisdiction of          (I.R.S. Employer
         incorporation or organization)        Identification No.)

  2545 Central Ave, Suite FD1 , Boulder,CO          80301-2857
  (Address of principal executive offices)          (Zip Code)

   Registrant's telephone number, including area code (303) 440-9988

      Securities registered pursuant to Section 12(g) of the Act:

                          Common Stock $.001 par value
                                (Title of Class)

     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 / /




<PAGE>  2
SOMATOGEN, INC.


     Indicate by checkmark 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   approximate   aggregate   market   value  of  voting  stock  held  by
non-affiliates of the registrant is $111,030,159 as of August 28, 1997.*

                             20,870,621
(Number of shares of Common Stock outstanding as of August 28, 1997)

Documents Incorporated by Reference

Registrant's Proxy Statement for use in connection with its Annual Meeting of
Stockholders  to be held on October 28, 1997 is  incorporated  by reference into
Part III of this Annual Report on Form 10-K.
- ----------------------------

*Excludes 3,789,058 shares of Common Stock held by Directors and Officers and
Stockholders  whose  beneficial  ownership  exceeds  ten  percent  of the shares
outstanding  at August 28, 1997.  Exclusion of shares held by any person  should
not be construed to indicate  that such person  possesses  the power,  direct or
indirect,  to direct or cause the direction of the management or policies of the
registrant,  or that such person is controlled  by or under common  control with
the registrant.


===============================================================================
Somatogen,  the  Somatogen  logo and  Optro  are  registered  tradenames  and/or
trademarks of the Company. All other brand names or trademarks appearing in this
Annual Report on Form 10-K are the property of their respective holders.



<PAGE> 3

                                    PART I


Item 1.  Description of Business

         Somatogen,   Inc.  (the  "Company")  is  a  biopharmaceutical   company
developing  specialty  oxygen  therapeutics  and  other  pharmacological  agents
utilizing its proprietary recombinant hemoglobin technology.  The Company's lead
development compound,  rHb1.1, is a recombinant variant of human hemoglobin. The
Company's  first  proposed  application  of  rHb1.1  is  as an  oxygen  carrying
pharmaceutical  for use in surgery to reduce or eliminate  the  requirement  for
allogeneic  (donor) blood  transfusions.  The Company  proposes to market rHb1.1
under the registered trademark "Optro(R)."

         Other  therapeutic  applications  under  investigation  for recombinant
hemoglobin  include the  treatment  or  prevention  of tissue  hypoxia  (lack of
oxygen)  observed  with severe  hemorrhage  (trauma),  acute  cerebral  ischemia
(stroke) and acute  myocardial  ischemia  (myocardial  infarction).  Somatogen's
discovery  research  program  is  focused on  designing  recombinant  hemoglobin
molecules which are targeted for these and other hypoxia indications.

         In June 1994, the Company entered into a global strategic alliance (the
"Alliance") with Eli Lilly and Company  ("Lilly") to co-develop  Optro. In March
1997,  the  Company  received  notice of Lilly's  decision  to  discontinue  its
co-development  of Optro.  The  termination was effective May 20, 1997, at which
time all rights to Optro  reverted  back to the  Company,  except the  marketing
rights to Optro in Scandinavia  which Pharmacia & Upjohn Inc. received under its
1991 agreement with the Company.  In accordance with the termination  provisions
of the  Alliance,  the  Company  received  a  one-time  termination  payment  of
$6,000,000  in May 1997 and in July  1997,  the  Company  and Lilly  executed  a
revolving  credit  agreement  which  provides  that the Company may borrow up to
$8,000,000 from Lilly.

Background

Tissue Oxygenation

         Maintaining  a  stable  level  of  oxygenation  in  all  tissues,   but
especially  those  vital  to  life,  is  an  essential  requirement  for  normal
physiological  function. In fact, vital organs begin to shut down and die within
minutes  of a  disruption  in  oxygen  delivery.  The body has  several  natural
mechanisms  that are designed to protect  against the  potentially  catastrophic
effect of a disruption of oxygen delivery: key organs are fed by several primary
and  collateral  blood  vessels;  circulating  red blood cells normally exist in
overabundance; and shunting and changes in vascular tone can redirect blood flow
to areas of need.  Despite these  safeguards,  vital organs are susceptible to a
sudden reduction in oxygen delivery and resulting acute cellular hypoxia,  which
is a leading cause of death.

         Organs and tissues  become  hypoxic when not enough oxygen is delivered
to the cells.  Tissue  hypoxia is defined  as a  condition  in which  cells of a
tissue have abnormal  oxygen  utilization  such that the tissue is  experiencing
anaerobic  metabolism.  Oxygen is  transported  to  tissues  by red blood  cells
carried in the blood.  If red cells are lost or prevented from reaching  organs,
hypoxia  results.  Usually,  this  occurs one of two ways:  red blood  cells are
decreased by serious bleeding, often due to trauma, surgery, or some other cause
of  bleeding,  or red cells cannot reach vital organs due to blockage of a major
blood vessel, as occurs during a stroke or heart attack.

<PAGE> 4


         Bleeding:  Serious blood loss is treated by transfusing red blood cells
collected from donors. A blood transfusion replaces volume and most importantly,
oxygen delivering capacity. Donor blood must be typed and crossmatched to ensure
compatibility with the recipient and any mistake in testing can result in death.
In  situations of trauma,  the time  required for matching  donor blood with the
recipient can mean the  difference  between life and death.  Blood  transfusions
administered in conjunction with surgery are performed to prevent tissue hypoxia
from occurring.  Exposure to donor blood, however, carries with it a finite risk
of  transmission  of  infectious  diseases  (such  as AIDS  and  hepatitis)  and
complications   of   transfusion-related   immunosuppression.   Concerns   about
transfusions  with donated blood have created a significant  need for minimizing
its use.

         Ischemia:  Acute  blockage of arteries is the cause of both  myocardial
(heart) and cerebral (brain) hypoxia. When hypoxia is due to a decrease in blood
flow,  it is called  ischemia.  Therapy  is aimed at  removing  the cause of the
blockage (usually blood clot) and  reestablishing  flow. In the area of coronary
artery  blockage,  several  options  exist.  Drugs that  break up clots,  called
thrombolytics,  are  employed,  as  well as  several  surgical  techniques.  For
cerebral  blockage  (stroke) there are fewer choices.  Surgery is usually not an
option and thrombolytics have just begun to be cautiously used for certain types
of  stroke.  Despite  great  strides in the  treatment  of both  myocardial  and
cerebral  ischemia,  acute hypoxia still leads in many cases to organ damage and
even  death.  Time is of the  essence to reverse the  hypoxia,  therefore  other
therapeutic  agents  that  could  minimize  the impact of the lack of oxygen are
needed.

The Hemoglobin Molecule

         Blood is a complex fluid  composed of several  distinct  types of cells
suspended in plasma.  Red blood cells,  which form the vast  majority of blood's
cellular  population,  are responsible for  transporting  and delivering  oxygen
throughout  the body.  Hemoglobin  is the  portion  of the red  blood  cell that
captures  oxygen in the lungs.  The red blood cell then transports the oxygen to
the tissues where the oxygen is released and metabolized.

         Hemoglobin  is a  protein  composed  of four  separate  peptide  chains
(called  "globins") with similar amino acid sequences:  two alpha chains and two
beta  chains.  Each globin  chain  combines  with an  iron-containing  component
(called "heme") to form the hemoglobin molecule. The iron atom contained in each
heme group directly binds one oxygen molecule, allowing four oxygen molecules to
bind to each hemoglobin molecule.

         Variations in the amino acid sequence of the globin chain can influence
the oxygen delivery  characteristics of hemoglobin.  Variant forms of hemoglobin
are commonly  referred to as  "mutants."  Hemoglobin  mutants with a high oxygen
affinity bind oxygen  readily in the lungs but do not release  oxygen as readily
to the tissues.  Conversely,  hemoglobin mutants with a low oxygen affinity bind
oxygen  somewhat less readily in the lungs but may release it more easily to the
tissues.

<PAGE> 5

Tissue Oxygenating Therapeutics

         The Company believes that hemoglobin solutions possess  characteristics
that make them well-suited for acute oxygen delivery. The hemoglobin molecule is
much  smaller  than a red  blood  cell and being in  solution  it may be able to
travel past  blockages and through  blood clots to reach vital organs.  Also, by
not having to squeeze  through  capillaries  (where  oxygen  diffusion to tissue
occurs) in a manner similar to red blood cells, hemoglobin solutions may be more
efficient at delivering oxygen than a red blood cell.  Hemoglobin  solutions may
be useful for preventing or reversing  acute hypoxia and preserving  vital organ
function until more definitive medical or surgical  intervention can be applied.
Examples of conditions or diseases that result in acute hypoxia include: serious
blood loss (e.g., surgical bleeding, trauma,  gastrointestinal  bleeding), acute
myocardial  ischemia,  acute  cerebral  ischemia,   sickle  cell  crisis,  acute
peripheral vascular ischemia, and acute bowel ischemia.

         There have been numerous attempts to develop a hemoglobin-based  oxygen
carrying solution for use in medicine,  most particularly as a therapeutic which
can be used in surgery as a temporary  oxygenating agent to minimize exposure to
donor blood.  Many of these activities are ongoing today and involve  hemoglobin
extracted from human or bovine (cow) red blood cells ("stroma-free hemoglobin").
However,  stroma-free  hemoglobin  has  several  characteristics  which  must be
corrected in order to make it suitable for use as a  therapeutic  agent.  First,
when human  hemoglobin  is  removed  from the human red blood  cell,  its oxygen
affinity  increases,  thereby  causing the hemoglobin to bind oxygen too tightly
and  significantly  reducing  oxygen  delivery  to the  tissues.  In  order  for
human-derived   stroma-free  hemoglobin  to  be  used  as  an  effective  oxygen
therapeutic,  its oxygen  affinity must be reduced by chemical  treatment.  Such
modification,  however, is not required for bovine-derived  hemoglobin.  Second,
stroma-free  hemoglobin  tends to dissociate  (or separate)  into two alpha-beta
globin pairs (called  "dimers") which can be toxic to the kidneys.  Dissociation
can be avoided in stroma-free hemoglobin by chemically linking,  polymerizing or
otherwise  chemically   modifying  the  hemoglobin   molecule.   More  recently,
genetically  engineered animals and plants (transgenic  animals and plants) have
been explored as potential sources of human-type hemoglobin.  Synthetic products
designed to carry  oxygen,  such as  perfluorocarbons  ("PFCs"),  have also been
explored as temporary oxygen carrying therapeutics. To date, no product based on
stroma-free hemoglobin, transgenic plants or animals has been approved for human
use as a therapeutic in the U.S. See "Competing Technologies."

Commercial Opportunity

         The  Company  believes  the  commercial   opportunity  for  recombinant
hemoglobin-based tissue oxygenating  therapeutics potentially spans the spectrum
of human  diseases  and  conditions  which lead to or result in tissue  hypoxia.
These  conditions/diseases  include,  for  example,  serious  blood loss,  acute
myocardial ischemia, acute cerebral ischemia,  trauma, sickle cell crisis, acute
peripheral vascular ischemia, and acute bowel ischemia.

<PAGE> 6

Surgical Blood Loss

         The loss of blood during surgery or from other acute causes reduces the
body's  ability  to  meet  the  metabolic  demands  of the  tissues  and  places
additional  stress on the  cardiovascular  system. In patients who have suffered
only mild to moderate blood loss, cardiovascular stress can be mitigated and the
metabolic   demands  of  the  tissues   can  be  met   through   infusion  of  a
volume-expanding  solution such as saline or human serum  albumin.  However,  in
cases where a patient has lost greater  amounts of blood,  the  reduction of the
blood's oxygen-carrying  capacity can have adverse physiological effects. At the
present time,  oxygen-carrying capacity can be enhanced only by a transfusion of
red blood cells.

         Each year in the U.S.,  approximately  2.5 million  patients  undergo a
major  surgical  procedure  (elective and emergent)  which results in sufficient
bleeding  to  require a blood  transfusion.  More  than  half of these  patients
receive 1-2 units of donor blood and another 30% receive 3-4 units. In the U.S.,
approximately  9  million  units of donor  blood are  transfused  each year into
surgical patients to treat acute blood loss.

         The problems associated with human donor blood have stimulated numerous
efforts to reduce  transfusions  with  donated  blood.  The risk of  blood-borne
infectious  disease  has  caused  transfusion  guidelines  to be changed so that
certain patients who historically would have received transfusions are no longer
transfused.  Some hospital  transfusion  review committees have  characterized a
transfusion  of donor blood as an  "undesirable  outcome"  of  surgery.  Certain
patients in good  health can elect to deposit  their own blood prior to surgery,
potentially  reducing  or  eliminating  their need to receive  donor  blood.  In
certain types of surgical procedures,  lost blood can be collected,  treated and
re-infused, or blood loss can be reduced through the use of drugs.

         The past decade has seen an increase in the  incidence  of  blood-borne
infectious  diseases,  such as AIDS and  hepatitis,  which  has  heightened  the
awareness of both health care  professionals  and patients to the inherent risks
of blood transfusions.  Although new tests have been developed,  such tests have
not entirely eliminated the risk of infectious blood-borne disease transmission.
In addition,  despite improved testing  standards,  human error still results in
the  release  of  contaminated  units of  blood.  Furthermore,  some  infectious
diseases are known to contaminate the blood supply but cannot be avoided because
no reliable or cost effective  diagnostic tests exist. New infectious agents can
suddenly appear in the blood supply, and it can take years to develop a reliable
test for such agents.  Several years elapsed  between the appearance of AIDS and
the development of a reliable test, and numerous  patients  contracted AIDS from
transfusions  during  that time.  The current  blood  supply is  dependent  upon
volunteer donors.  Increasingly stringent  donor-screening  criteria have caused
the donor pool, and therefore the potential  supply of blood, to contract.  As a
consequence, the cost and intricacy of collecting, testing and storing blood has
greatly increased in recent years.

         The Company  believes  that oxygen  carrying  solutions  like Optro may
prove  to be  effective  in the  treatment  of these  patients  and  reduce  the
requirement for a donor blood transfusion.

<PAGE> 7

Enhanced ANH in Cardiac Surgery

        Cardiac surgery is a major subset of the surgical  procedures  described
above.  Each year in the U.S.,  approximately  500,000  patients undergo cardiac
surgery for coronary  artery  bypass  grafting,  septal  defect  repair or valve
replacement.  These procedures are highly  traumatic to the patient.  A 12 to 16
inch  incision  is made in the chest and the breast bone  (sternum)  is sawed in
half to allow access to the heart. During this surgical procedure, the patient's
heart is stopped (so surgery can be performed on the heart) and his/her blood is
pumped outside the body,  circulated through an extracorporeal  oxygenator,  and
returned to the patient and pumped  throughout the body to provide oxygen to the
tissues. This part of the procedure is called "cardiopulmonary  bypass" ("CPB").
Exposure  of the  patient's  blood to the CPB  machine  may damage the blood and
result  in  significant  post-operative  bleeding  and  other  complications.  A
procedure called acute normovolemic  hemodilution  ("ANH") is frequently used in
cardiac  surgery to  sequester  the  patient's  blood  before going on bypass to
minimize exposure to the CPB machine. The Company believes that the use of Optro
in  this  setting  may  allow  greater  amounts  of the  patient's  blood  to be
harvested, thus decreasing post-operative blood use and bleeding complications.

Trauma

         The  opportunity   for  using   recombinant   hemoglobin-based   oxygen
therapeutics  in  trauma  potentially  extends  beyond  the  emergency  room and
surgical suite where donor blood is used today. Optro does not require typing or
cross-matching,  thereby eliminating the time required to perform such functions
or the need to store multiple  units of Type O blood (which may be  administered
to anyone  regardless of blood type).  In addition,  initial results from animal
studies indicate that Optro is more efficacious than blood in resuscitation from
hypovolemia (a condition  resulting from extensive blood loss), a common problem
often  associated with trauma.  Each year in the U.S.,  there are  approximately
400,000  victims  of  blunt  or  penetrating  trauma  which  results  in  severe
hemorrhage, but resuscitation with an oxygenating therapeutic (donor blood) does
not begin  until  the  patient  arrives  in the  hospital  emergency  room.  The
mortality  rate for these victims is quite high,  and the Company  believes that
earlier resuscitation of these patients with an oxygen-carrying therapeutic like
Optro could potentially save lives.

Stroke (acute cerebral ischemia)

         Stroke is the third  leading  cause of death in the U.S.  Approximately
500,000  people suffer a new or recurrent  stroke every year, and 150,000 people
die each year as a result. Obstruction of arteries feeding the brain by thrombus
(blood clot) or embolus or failure of the systemic  circulation and hypotension,
if severe and  prolonged  enough,  can deprive brain tissue of blood and oxygen,
leading to ischemic  disruption of physiologic  function and subsequent necrosis
(infarction). The cardinal feature of cerebrovascular disease is the "stroke", a
term that  connotes the sudden and dramatic  development  of a focal  neurologic
deficit as a result of disruption of blood flow to a portion of the brain.

         Ischemia accounts for 80% of acute strokes,  while hemorrhage  accounts
for the remainder. Within the thrombotic stroke population, whether or not it is
preceded by warning signs,  each year in the U.S. 60% or  approximately  240,000
people will  experience a single massive  attack.  A stroke  develops  suddenly,
often in a matter of minutes.

<PAGE> 8

         It is during this acute onset phase of ischemic stroke that recombinant
hemoglobin-based oxygenating therapeutics could potentially provide a critically
needed benefit by supplying oxygen to deprived brain cells downstream,  reducing
the severity of neurologic damage.

Myocardial Infarction  (acute myocardial ischemia)

         Myocardial  infarction  is caused by a lack of blood  flow to the heart
tissue.  An estimated  seven million people in the U.S.  suffer from  clinically
active coronary artery disease,  which causes 1.5 million myocardial infarctions
and over half a million deaths each year.  Coronary  artery disease results from
atherosclerosis,  a complex process that occurs in many large arteries including
the coronary  arteries  which supply blood to the heart.  This process  develops
over a number of years and may eventually  result in the formation of a stenosis
(blockage)  in the coronary  artery.  If the vessel  becomes  narrowed too much,
blood flow can be reduced to levels which can result in angina  pectoris  (chest
pain) or a more life-threatening myocardial infarction and even sudden death. In
the case of acute myocardial  infarction,  plaque in the sclerotic region of the
vessel  ruptures and causes a clot to form on the plaque  surface,  resulting in
many cases in a cessation of blood flow to the heart muscle down stream.

         Current therapeutic approaches include drugs that dilate blood vessels,
those which  decrease  the  workload  of the heart in order to conserve  oxygen,
thrombolytics  (clot busters) and combinations of these.  There are currently no
drugs  available  that  increase  the  oxygen  content  of  blood.   Recombinant
hemoglobin-based  oxygenating  therapeutics would appear to be ideal therapeutic
agents to increase the oxygen  content of the blood and perfuse the areas distal
to the arterial occlusion.

         Several  drugs,  including  tissue  plasminogen  activator  ("TPA") and
streptokinase,  have been approved for use in treating heart attacks and related
cardiovascular  disorders. In this ischemic setting, the Company believes that a
recombinant  hemoglobin-based oxygenating therapeutic may be a useful adjunct to
thrombolytic  agents by  increasing  the speed at which  oxygen  delivery to the
heart may be restored.

         The  Company  also  believes   that  a   recombinant   hemoglobin-based
oxygenating  therapeutic  may be useful as an adjunctive  therapy in angioplasty
(cardiac  catheterization)   procedures.   Approximately  half  of  the  600,000
angioplasty procedures performed in the U.S. each year involve patients who have
a high  risk of  negative  outcomes.  Recombinant  hemoglobin  could be given by
intracoronary  administration  during the  angioplasty  procedures  to  minimize
ischemic  damage  associated  with  mechanical  closure  of  the  vessel  during
angioplasty.

<PAGE> 9

Somatogen's Recombinant Hemoglobin Technology

         The Company  believes it is a leader in  characterizing  the structure,
function  and  molecular  biology  of  the  human  hemoglobin  molecule  and  in
developing   recombinant  human  hemoglobin  as  potential  tissue   oxygenating
therapeutics.   Somatogen   believes  that  it  is  the  only  company  to  have
successfully cloned,  expressed and purified  recombinant  hemoglobin that binds
oxygen in a manner similar to hemoglobin contained in human red blood cells. The
Company is using genetic  engineering to develop other forms of hemoglobin  with
molecular characteristics designed to address specific clinical needs.

         Somatogen has used its proprietary recombinant hemoglobin technology to
develop its first potential product,  Optro (rHb1.1),  an oxygen therapeutic for
use in surgery and trauma.  rHb1.1 is a molecular  variant of human  hemoglobin.
Unlike stroma-free hemoglobin, recombinant hemoglobin:

    o Eliminates the risk of infectious disease  transmission.  Because Optro is
      produced recombinantly,  it has no risk of transmission of human or animal
      blood-borne infectious diseases such as AIDS and hepatitis.

    o Avoids the need for chemical  modifications.  Somatogen  has addressed the
      inherent  limitations  of  extracellular   hemoglobin  by  synthesizing  a
      hemoglobin molecule that is very similar to human hemoglobin but which has
      been  genetically  altered to prevent the molecule from fragmenting in the
      bloodstream.  By making  these  changes at the  genetic  level,  Somatogen
      avoids  the  need to  modify  the  hemoglobin  molecule  through  chemical
      processing.

    o Improves oxygen-delivery capability.  Somatogen has genetically engineered
      Optro in a manner which it believes,  based on animal studies, may release
      oxygen  to  tissues  in the body  more  effectively  than  the  hemoglobin
      contained  in  transfused  red blood  cells.  Nuclear  magnetic  resonance
      spectroscopy  tests in animals to measure  tissue high  energy  phosphates
      (and  metabolic  intermediates)  suggest  that Optro is more  effective in
      delivering oxygen to tissue than red blood cells.

    o Can be  manufactured  at  large  scale.  Optro  is  manufactured  using  a
      microbial  fermentation  process  which may be  performed  at large scale.
      Unlike  stroma-free  hemoglobin  products  which depend on animal or human
      blood as a starting  material,  the raw materials for the  fermentation of
      Optro  are  simple  sugars  and  nutrients  which are  available  in large
      quantities.


<PAGE> 10


Products in Development

         Somatogen is using its  recombinant  hemoglobin  technology  to develop
products for a range of therapeutic applications.  These products include Optro,
the Company's initial oxygen-carrying  pharmaceutical.  The Company is currently
performing  expanded safety and efficacy  studies of Optro in surgical  patients
who are experiencing blood loss and in patients suffering from chronic anemia.
See "Clinical Development."

Optro (rHb1.1)

         Listed  below  is a  summary  of  the  potential  applications  of  the
Company's recombinant human hemoglobin products currently in development:

         Enhanced Acute Normovolemic  Hemodilution.  Patients undergoing cardiac
surgery have their blood exposed to a heart-lung  machine which  oxygenates  and
pumps their blood while surgery is being  performed on the heart.  This exposure
may damage the blood and result in significant post-operative bleeding and other
complications.  A procedure called acute normovolemic hemodilution is frequently
used in cardiac surgery to harvest the patient's blood before going on bypass to
minimize exposure to the heart-lung  machine.  The Company believes that the use
of Optro in this setting may allow greater  amounts of the patient's blood to be
harvested,  thus decreasing post-operative blood use and bleeding complications.
Somatogen is currently  conducting a Phase II clinical trial in cardiac surgery.
See "Clinical Development."

         Intraoperative  Blood Replacement.  The Company believes that Optro may
be useful  in the  treatment  of blood  loss that  occurs  in  surgery.  Concern
regarding  transmission  of  infectious  diseases and other  adverse  effects of
giving donor blood has given rise to efforts to reduce or eliminate transfusions
of donor  blood  whenever  practicable.  A number of  techniques  are  currently
utilized to maximize the conservation of blood,  including  autologous  donation
(self-donation),  intraoperative cell salvage,  intraoperative hemodilution, and
use of  various  pharmacologic  agents  to  reduce  intraoperative  blood  loss.
Notwithstanding these efforts, over 2.5 million surgical patients are exposed to
blood transfusions with donated blood in the U.S. each year.  Somatogen believes
that Optro may reduce the  exposure of surgical  patients  to  transfusion  with
donor blood.  The Company is currently  reviewing  and  developing  its clinical
trial design in the interoperative setting. See "Clinical Development."

         Trauma.  Somatogen  believes  that  Optro  may  also be  useful  in the
hospital  emergency  room and in settings  outside of the  hospital  environment
because Optro does not require typing or cross-matching, thereby eliminating the
time required to perform such  functions or the need to store  multiple units of
Type O blood (which may be  administered  to anyone  regardless  of blood type).
Results from animal studies  indicate that Optro is more  efficacious than blood
in resuscitation  from  hypovolemia (a condition  resulting from extensive blood
loss), a common problem often  associated with trauma.  The Company is currently
in preclinical testing and developing a clinical trial design in trauma.

         Erythropoiesis/chronic  anemia.  The Company is  investigating  whether
rHb1.1 stimulates the production of new red blood cells. Preliminary experiments
in an animal  model of  induced  anemia  and in human  hematopoietic  tissues in
vitro demonstrated  hematopoietic activity with rHb1.1. The exact mechanism of
action,  however,  is not  known.  Somatogen  is  currently  conducting  Phase I
clinical  studies in patients with chronic renal failure and primary bone marrow
cancer.  See "Clinical Development."


<PAGE> 11

Next Generation rHbs

         Somatogen  has  constructed  several  different  forms  of  recombinant
hemoglobin that have been genetically engineered and, in some cases,  chemically
modified  to  achieve   enhanced   attributes   including  the   elimination  of
vasoactivity and extended circulating half-life.  The Company believes that such
a  modified  recombinant  hemoglobin  may be useful  in a number of  therapeutic
applications such as acute myocardial  ischemia and acute cerebral ischemia.  In
addition, the Company believes that these molecules may be applicable in some of
the applications  identified  above for Optro.  These molecules are currently in
the research stage and early preclinical testing.

         The Company's products will require significant additional research and
development,  including extensive  preclinical and clinical testing,  before the
Company  will be able to  obtain  FDA or  foreign  regulatory  approval  for any
indication, if at all. There can be no assurance that the Company's research and
development efforts will be successful, that any of the Company's products under
development,  including  Optro,  will prove to be safe or  effective in clinical
trials,  that  the  Company  will be able to  obtain  FDA  approval  to sell any
products,  that any products can be  manufactured  at  acceptable  cost and with
appropriate  quality,  or  that  any  products,  if and  when  approved,  can be
successfully marketed.

Clinical Development

Oxygen Delivery Indications

         Somatogen is currently  pursuing clinical  development of Optro for the
enhancement  of acute  normovolemic  hemodilution  in cardiac  surgery  and as a
temporary oxygen therapeutic to treat acute blood loss in elective surgery.  The
clinical trials of Optro are being conducted in three sequential  phases (Phases
I, II and III), although the phases may overlap.  The Phase I trials, which have
been  completed,  gathered data on safety and dosage  tolerance and  preliminary
data on  pharmacokinetics.  Following  completion  of the  Phase I  trials,  the
Company  reviewed the results of such trials with the FDA, which  authorized the
Company to proceed to early Phase II trials.  The Company initiated these trials
in the fall of 1994 in order to  provide  additional  safety  data and to gather
preliminary   efficacy/activity  information  in  patients  undergoing  elective
surgery.  These trials were completed in September 1995. In July 1996, Somatogen
commenced an expanded Phase II trial in elective  surgical  patients in order to
gather   additional   safety   information   as  well   as  more   comprehensive
efficacy/activity  information.  The  Phase  II trial  in the  elective  general
surgical setting was discontinued after the termination of Somatogen's strategic
alliance with Lilly.  In April 1997, a Phase II trial was initiated by Somatogen
to explore safety and preliminary  efficacy in enhanced ANH in cardiac  surgery.
If the Phase II trial is successfully completed,  the Company plans to undertake
Phase III trials to  establish  safety and  efficacy in a larger  population  of
surgical  patients to provide  the basis for the filing of a  Biologics  License
Application with the FDA.

         There can be no  assurance  that any of the  clinical  testing  will be
completed successfully within any specified time period, if at all, with respect
to Optro or any of the Company's  products.  There can also be no assurance that
such  testing  will show Optro or any other  product to be safe or  efficacious.
Furthermore,  the Company or the FDA may suspend  clinical trials at any time if
the subjects or patients  participating in such trials are thought to be exposed
to  unacceptable  health risks.  There can be no assurance that the Company will
not  encounter  problems in clinical  trials which will cause the Company or the
FDA to suspend  clinical  trials or which will result in delays in the Company's
clinical trials.

<PAGE> 12

         The range of therapeutic  applications  for which Optro may be suitable
will depend in part on its duration of action.  The  Company's  clinical  trials
conducted  to date have not been  specifically  designed to measure  duration of
action,  but Optro and other  hemoglobin-based  oxygen  carrying  solutions will
likely have significant  shorter duration of action than transfused blood. There
can be no assurance that the duration of action of Optro will permit the product
to be  therapeutically  useful in a sufficient  number of indications to make it
commercially viable.

Phase I and Phase I/II Clinical Trials

         From 1991 through 1994, the Company conducted a series of safety trials
of Optro,  initially  in  normal  volunteers  (Phase  I) and  later in  surgical
patients  (Phase I/II).  These trials  involved an aggregate of 120 subjects and
patients,  of whom 99 received  Optro and 21  received  control  solutions.  The
maximum dose in these safety trials was 25 grams.

         In the course of the trials,  certain subjects  experienced  transitory
mild to moderate  symptoms,  including certain  gastrointestinal  symptoms.  The
Company instituted  manufacturing process changes which reduced the incidence of
certain symptoms, and used several common pharmacologic agents as appropriate to
prevent or manage these symptoms.

Early Phase II Clinical Trials

         From December 1994 to September 1995,  Somatogen  conducted early Phase
II trials of Optro for two  indications:  intraoperative  blood  replacement and
acute normovolemic hemodilution.

         Intraoperative Blood Replacement: This single blinded, controlled trial
was designed to study safety and to gather preliminary efficacy/activity data in
patients who experienced blood loss during surgery.  This multi-center  clinical
trial involved 23 patients, of whom 16 received Optro at doses ranging up to 100
grams and seven patients received donated blood as a control. Six Optro patients
received  doses of 25 grams,  four received  doses of 50 grams,  three  received
doses of 75 grams,  and  three  received  doses of 100  grams.  The first  three
patients at the 25 gram dose level were  infused at a controlled  rate,  and all
other  patients  were  infused at a rate  comparable  to the rate of infusion in
blood  transfusions.  There were no  clinically  significant,  treatment-related
adverse  events in this  clinical  trial.  Patients  in this trial  received  no
prophylactic  pre-treatment with any drugs to manage or avoid potential symptoms
or side  effects of Optro.  None of the patients in this study  experienced  the
gastrointestinal  symptoms  that  had  been  seen  in  certain  subjects  in the
Company's  prior  Phase I  clinical  trials.  In  certain  patients,  there were
transitory  elevations  of  amylase  and  lipase  (pancreatic  enzymes),   which
spontaneously resolved without treatment and which investigators  determined not
to be clinically significant.

         Acute Normovolemic Hemodilution:  This single blinded, controlled study
was designed to measure safety and to gather preliminary  efficacy/activity data
in patients who donated blood and received Optro just prior to surgery, at doses
ranging up to 50 grams.  Ten patients were dosed,  of whom seven  received Optro
and three received saline as a control.  Three patients received 12.5 grams, one
patient  received  25 grams  and  three  patients  received  50 grams of  Optro.
Patients in this trial received no prophylactic  pre-treatment with any drugs to
manage or avoid  potential  symptoms  or side  effects  of Optro.  There were no
clinically    significant,    treatment-related    adverse   events,    and   no
gastrointestinal  symptoms  in any of the  patients  in  this  study.  As in the
intraoperative  trial,  certain patients  experienced  transitory  elevations of
amylase and lipase levels,  which  spontaneously  resolved without treatment and
which investigators determined not to be clinically significant.

<PAGE> 13

  Late Phase II Clinical Trials

         In  July  1996,  the  Company   commenced   patient   enrollment  in  a
multi-center  late Phase II study of Optro to deliver  oxygen and restore  blood
volume  as a  treatment  for  acute  blood  loss  during  elective  surgery.  In
connection with the Lilly strategic alliance,  Lilly was managing this study and
upon  termination of the Alliance the study was  discontinued.  In April 1997, a
multicenter  Phase II trial was  initiated  by Somatogen as the first of several
studies to explore the safety and efficacy of enhanced  ANH in cardiac  surgery.
These studies will, when completed,  examine the safety and efficacy of removing
up to four units of autologous  blood via ANH,  with Optro  replacing the volume
withdrawn.  These  studies  will enroll  approximately  50  patients  undergoing
coronary  artery  bypass  graft  surgery  at  approximately  five  to ten  sites
throughout the U.S.

Chronic Anemia Indication

         The Company has initiated Phase I trials of its recombinant hemoglobin,
rHb1.1,   as  a  potential  agent  for  stimulating  red  blood  cell  formation
(hematopoiesis).  The first trial was  initiated in June 1996 and will  evaluate
the  safety  and  hematopoietic  activity  of  repeated  low  doses of rHb1.1 in
approximately  35 patients with anemia  resulting  from end stage renal disease.
This randomized, double-blind,  placebo-controlled trial is a dose-ranging study
being  conducted  at six sites in the U.S.  Participants  in the trial will have
been on  hemodialysis  for six  months  or more,  and  will  have  responded  to
treatment with exogenous erythopoietin.

         A second  trial is designed to  evaluate  the safety and  hematopoietic
activity of repeated low doses of rHb1.1 in approximately 15 to 20 patients with
chronic  anemia  due  to  primary  bone  marrow  failure  and  malignancy.  This
randomized, open-label dose-ranging study is being conducted at several sites in
the U.S. Based on data analysis and other priorities, the Company will determine
whether to proceed with further  development of  recombinant  hemoglobin in this
indication.

Competition

         In some cases  Optro will  compete  directly  with red blood  cells for
volume  expansion and oxygen delivery  applications and with other solutions for
volume expansion applications.  Additionally,  Optro may supply clinical utility
in  specific  clinical  situations  where  the  use of red  blood  cells  is not
necessary.  There  can be no  assurance  that  Optro  or any  other  product  of
Somatogen will have advantages which will be significant enough to cause medical
professionals  to adopt  its use  rather  than to  continue  to use  established
therapies.  The pricing of  Somatogen's  products  in  relation  to  established
therapies  could also  affect  market  acceptance  of such  products.  Somatogen
believes,  however,  that Optro will compete on the basis of quality  because it
may offer a safe and  cost-effective  solution to the problems of red blood cell
transfusions,  while  avoiding  the  problems  of  stroma-free  hemoglobin.  See
"Somatogen's Recombinant Hemoglobin Technology."

<PAGE> 14

         Competition in the pharmaceutical  industry is intense.  There are many
pharmaceutical   companies,   biotechnology   companies,   public  and   private
universities  and  research  organizations  actively  engaged  in  research  and
development  of blood  substitute  products.  Many of the Company's  existing or
potential competitors have substantially greater financial,  technical and human
resources  than the Company and may be better  equipped to develop,  manufacture
and  market  products.  In  addition,  many of these  companies  have  extensive
experience in preclinical testing and human clinical trials. These companies may
develop and  introduce  products and processes  competitive  with or superior to
those of the Company.  Companies  pursuing several  competing  technologies have
entered or are expected to enter clinical trials for their  products.  There can
be no assurance that the Company will be able to compete successfully.

Competing Technologies

         Problems  associated  with the  transfusion  of human  donor blood have
stimulated  numerous  efforts to reduce  transfusion  with donated  blood.  Most
efforts  to  develop  an  oxygen  carrying   therapeutic  have  concentrated  on
developing  stroma-free  hemoglobin  from  human  or  bovine  red  blood  cells.
Stroma-free  hemoglobin  must  be  rigorously  purified  to  remove  all  of the
non-hemoglobin  elements  of the red  blood  cell to  avoid  potentially  severe
reactions resulting from the contaminating  elements.  In addition,  stroma-free
hemoglobin  must be chemically  modified in order to prevent  dissociation  into
dimers  which can be toxic to the  kidneys.  Hemoglobin  derived  from human red
blood cells must also be chemically modified to reduce its oxygen affinity.

         The  use  of  stroma-free  hemoglobin  suffers  from  certain  inherent
limitations.  Hemoglobin  that is obtained  from human blood may carry a risk of
transmission  of  blood-borne   infectious   disease.   The   technologies   for
inactivating  viral  agents in human blood are rather  limited  and  unproved at
present. In addition, the supply of human-derived hemoglobin is dependent on the
availability of human donor blood.  Today, there is not a ready supply of excess
human blood.  An  alternative  approach to the supply  problem  associated  with
human-derived  hemoglobin is to derive products from plants or animals that have
been genetically  engineered to produce human hemoglobin  (transgenic  plants or
animals).   However,  Somatogen  believes  that  the  transgenic  production  of
hemoglobin  may have  limitations,  including  some of the same  limitations  as
stroma-free  hemoglobin.  At least four other companies have announced that they
are  conducting  human  clinical  trials  of  hemoglobin-based  oxygen  carrying
solutions. One of these companies, Baxter International Inc., has announced that
they have filed for product  registration in Europe and received FDA approval to
commence  two  pivotal  Phase III studies in the U.S.  with their  human-derived
hemoglobin solution.

         Several of the Company's  competitors are currently developing products
derived  from  bovine  hemoglobin,  which  has a  molecular  structure  that  is
different from human hemoglobin.  One of the Company's competitors is attempting
to modify bovine-derived  hemoglobin by attaching  polyethylene glycol molecules
in an effort to mask the  differences  between bovine and human  hemoglobin from
the human immune system. Just as hemoglobin sourced from human red cells carries
a risk of blood-borne disease  transmission,  hemoglobin sourced from animal red
blood cells may also transmit blood-borne disease.

<PAGE> 15

         Certain  other  non-hemoglobin  molecules  have also been  explored  as
oxygen  therapeutics.  PFCs, inert chemicals which are capable of dissolving and
transporting oxygen, have been studied most extensively.  PFCs are synthetically
produced thereby eliminating the risk of transmission of infectious diseases and
can  transport  large  amounts of oxygen.  The  Company is aware that two of its
potential  competitors  have  commenced  human trials for the use of a PFC-based
product as a temporary oxygen carrying fluid.

         The mechanism of oxygen  transport by PFC  compounds is very  different
from  hemoglobin or blood.  Oxygen is physically  dissolved  into PFC emulsions,
with no specific bonding interaction with the perfluorocarbon molecules. Thus, a
linear  increase in available  oxygen results in a linear increase in the amount
of oxygen  dissolved in the PFC  carrier,  in contrast to the  sigmoidal  oxygen
saturation-dissociation  curve for hemoglobin.  Consequently,  PFCs require very
high  oxygen  levels in the lung in order for them to  dissolve  physiologically
meaningful  amounts of oxygen. To achieve these high levels of oxygen,  patients
must be ventilated with high levels of oxygen.  Current anesthesia practice does
not utilize high oxygen inspiration during surgery, and in many situations it is
considered dangerous.

Sales and Marketing

         Because the initial  target  market for Optro is as an oxygen  carrying
therapeutic  to be used in  surgery,  Somatogen  will  focus its  marketing  and
selling efforts on key operating room personnel, including anesthesiologists and
surgeons.  Potential  customers are highly concentrated in the hospital setting,
therefore the Company  believes it can achieve  sales  coverage in North America
with a  relatively  small  specialized  sales  force.  The Company  will seek an
agreement  with a large  pharmaceutical  company for  assistance  in selling and
marketing Optro internationally. There can be no assurance that the Company will
be able to  build  such a sales  force  for  Optro in  North  America  or that a
suitable international partner can be secured.

         There can be no assurance that Somatogen or its partners,  if any, will
receive the necessary  governmental  approvals to market and distribute Optro in
any country.

Reimbursement

         Somatogen's  ability to  successfully  commercialize  its products will
depend in part on the extent to which reimbursement of the cost of such products
and related  treatment will be available from government  health  administration
authorities, private health insurers and other organizations. Third-party payors
are  increasingly  challenging the cost/benefit of medical products and services
in relation  to  clinical  outcomes.  Significant  uncertainty  exists as to the
reimbursement status of newly approved health care products, and there can be no
assurance  that  adequate  third-party  coverage  will be  available  to  enable
Somatogen to maintain price levels  sufficient for realization of an appropriate
return on its investment in product development.

Research and Development

         Somatogen's  research and  development  efforts are focused on clinical
trials of Optro, process development and next generation technology  development
of recombinant hemoglobin. In the process development area, Somatogen is working
on improving all phases of its existing pilot  manufacturing  processes in order
to allow economical commercial scale production.

         In fiscal 1997, 1996 and 1995, net research and development expenses 
were $15,807,000, $16,949,000 and $14,968,000, respectively.  Somatogen expects
these expenses to increase during the foreseeable future.

<PAGE> 16

Manufacturing

         The  Company's  ability  to  operate  profitably  will  depend  on  the
manufacturing of recombinant hemoglobin products in very large quantities and at
a competitive cost, while consistently  achieving  appropriate levels of product
quality.  To date,  Somatogen has  manufactured  its initial  product in a pilot
facility and only in limited quantities.  To successfully  establish  commercial
manufacturing capacity, further development is required to enhance manufacturing
processes, scale-up such processes,  reduce product costs and to demonstrate the
consistent  manufacture of a clinically  safe product.  The  implementation  and
testing of process  improvements in the Company's pilot production  facility may
affect the production  schedule for clinical material,  which may in turn affect
the rate of  progress  in  clinical  trials for  Optro.  Somatogen  has  devoted
substantial  resources to developing an efficient  production process capable of
producing   recombinant   hemoglobin.   Somatogen  has  genetically   engineered
recombinant  hemoglobin  to  overcome  certain of the  inherent  limitations  of
naturally occurring  hemoglobin.  By addressing these limitations at the genetic
level,  Somatogen has avoided the need to modify the hemoglobin molecule through
chemical processing.

         Optro is produced  through a  fermentation  process as a stable,  fully
functional, properly folded, soluble intracellular protein. Optro is produced by
introducing  the alpha  and beta  globin  genes  for Optro  into a host cell (E.
coli),  growing  large  quantities  of the  genetically  engineered  host cells,
breaking open the cells to remove the hemoglobin,  and purifying the hemoglobin.
In order to  function  properly,  the globin  chains  must be  properly  folded.
Additionally,  four heme groups must be properly incorporated into the molecule.
Somatogen's  proprietary  technology enables it to produce the entire hemoglobin
molecule  in E. coli  without  the need for any  subsequent  steps to  correctly
assemble the molecule.  The Company has also developed proprietary  purification
techniques for Optro using standard column chromatography and conventional large
scale processing equipment.

         Somatogen  constructed  and is  operating a pilot  production  facility
consisting   of   approximately   24,000  square  feet.   The  Company's   pilot
manufacturing facility includes a 600 and a 1,500 liter fermentor for production
of Optro. The pilot  manufacturing  facility includes the equipment necessary to
produce  hemoglobin in E. coli, to separate the hemoglobin from the cells and to
purify the  hemoglobin.  This facility has been  producing  Optro since December
1990 and is anticipated to have  sufficient  capacity to meet product demand for
most stages of clinical  testing.  The Company is currently  evaluating  various
manufacturing  strategies  to  support  launch and  commercialization  of Optro,
including a full assessment of the feasibility of contract manufacturing.

<PAGE> 17

         The manufacturing process for Optro requires substantial amounts of raw
materials.  Although  these raw materials are currently  available in quantities
sufficient to meet the Company's  current needs,  there can be no assurance that
these raw materials will be available in sufficient quantities to meet the needs
for commercial  production at an acceptable  cost, or that  regulatory  agencies
will approve the use of these raw  materials.  If the Company were to experience
raw  material  shortages,  such  shortages  could  affect its ability to produce
products.

         In order to  manufacture  Optro at a commercial  scale at an acceptable
cost,  Somatogen  must make further  improvements  in certain  existing  process
technologies,  and complete  adaptation of these technologies for use at a large
scale.  This  work is  focused  on  reducing  product  cost,  improving  current
expression  levels,  improving  recovery  of  recombinant  hemoglobin  following
fermentation,  enhancing  purification yields through use of improved techniques
and  materials,  and  increasing  product  stability.  Somatogen  believes  that
developing  a   cost-effective   manufacturing   process  for  commercial  scale
production  of Optro  with a  consistently  high  level of purity  will  require
improvements to some phases of its existing pilot manufacturing  processes,  but
should not require any fundamental technological breakthroughs.  There can be no
assurance that the Company will be able to  successfully  implement any of these
improvements  as scale-up  of the process to  commercial  levels  proceeds.  The
Company's  products  will be given in large  dosages.  They  must be  rigorously
purified  since  impurities  may lead to serious  and  potentially  fatal  toxic
reactions.   The  Company  must  also  develop  extremely  sensitive  analytical
techniques to show that it has achieved  acceptable  levels of product  quality.
There can be no  assurance  that the Company will be able to achieve or maintain
an appropriate  level of product  quality or that it can develop assays that are
sufficiently sensitive to demonstrate the required high levels of quality.

         As part of its  clinical  development  program,  the  Company  has made
process  improvements  to improve  product  quality and to reduce or  eliminate
potential   side  effects.   The  time  required  to  implement  some  of  these
improvements has resulted in extending the length of the clinical trials.  There
can also be no  assurance  that  process  changes  will not  require  additional
clinical  studies  and  expenditures  that  may  cause  delays  in the  clinical
development  of  Optro.  Additionally,  there  can  be  no  assurance  that  the
manufacturing  processes which have been developed can be successfully scaled-up
to the commercial levels  contemplated or that Optro or any other product can be
manufactured  at a cost and in  quantities  to make  such  product  commercially
viable.

Patents and Trade Secrets

         Proprietary  protection  for  the  Company's  products,  processes  and
know-how is important to Somatogen's  business.  The Company's policy is to file
patent applications to protect technology,  inventions and improvements that are
considered important to the development of its business. The Company also relies
upon trade secrets, know-how,  continuing technological innovation and licensing
opportunities to develop and maintain its competitive position.

         The Company seeks patent protection for its proprietary  technology and
products in the United States and in foreign  countries.  The Company's products
and  inventions  may involve  compounds  that are not  naturally  occurring  and
synthetic  forms  of  naturally  occurring  molecules.  To the  extent  that the
Company's  products or inventions  are synthetic  compounds that are not natural
products,  they  may,  provided  standard  patentability  criteria  are met,  be
afforded  patent  protection  under  well  settled   principles  and  procedures
established  by the U.S. and other  patent  offices.  To the extent  Somatogen's
products or inventions are synthetic forms of naturally occurring molecules, the
extent and nature of the protection available is less certain.

<PAGE> 18

         The   Company's   patents   include   claims  for  certain   hemoglobin
compositions and for the methods of use of certain  hemoglobin  compositions for
oxygen delivery, hematopoiesis and other uses. The Company has filed or licensed
patent  applications  in  the  U.S.  and  in  certain  other  countries  seeking
protection for recombinant  hemoglobin technology and compounds developed by the
Company and/or the Medical Research Council ("MRC"). In July 1991, the Company's
initial U.S.  patent was issued covering blood  substitute or oxygen  delivering
products based upon hemoglobin that has been  genetically  engineered to improve
its  ability to deliver  oxygen to the  tissues.  This patent will expire in the
year 2008.  Similar  patents have been issued jointly to the Company and the MRC
in the United  Kingdom  (expiring in 2007) and Australia  (expiring in 2004).  A
European patent  containing  certain related claims to  non-naturally  occurring
hemoglobins has also been granted.  Somatogen has entered into an agreement with
the MRC,  which  grants the Company the  exclusive  right to make,  use and sell
products  covered by such U.S. and U.K. patents and certain  additional  foreign
counterparts.  The  Company  has agreed to pay the MRC a royalty on net sales in
certain  countries of artificial  hemoglobin  products using the MRC know-how or
covered by an MRC  patent  for a period of 15 years from the date of  agreement.
Patents  covering methods of expressing and genetically  stabilizing  hemoglobin
have been issued to the Company in  Australia,  South Africa and New Zealand.  A
patent covering non-naturally occurring disulfide-stabilized hemoglobin has also
been issued in the U.S. (expiring in 2008). U.S. patents covering DNA coding for
mutant hemoglobins and certain dialpha  polypeptides were issued in fiscal 1997.
A broad European  patent to dialpha  and/or dibeta DNA and related  polypeptides
was also granted in fiscal 1997.  Other U.S. patents to  hematopoiesis,  certain
multimeric  hemoglobins  and certain  processes  have recently been issued.  The
remaining  hemoglobin-related patent applications owned, co-owned or licensed by
the Company are pending.

         The patent positions of biotechnology firms,  including Somatogen,  are
generally   uncertain  and  involve   complex   legal  and  factual   questions.
Consequently,  the Company does not know whether any of its pending applications
will result in the  issuance of any patents or whether any issued  patents  will
provide   significant   proprietary   protection  or  will  be  circumvented  or
invalidated.  Since patent  applications  in the U.S. are  maintained in secrecy
until patents issue and  publication  of discoveries in the scientific or patent
literature tend to lag behind actual  discoveries by several  months,  Somatogen
cannot be certain that it was the first creator of inventions covered by pending
patent  applications  or that it was the first to file patent  applications  for
such  inventions.  The Company is aware of certain U.S.  patents  owned by other
parties who may claim infringement by certain products or processes contemplated
by the  Company.  The  Company  believes  that  certain of such  patents  may be
invalid.  The  Company  believes  that  licenses  would be  available  for other
patents, that the Company's contemplated products, processes or methods could be
used in a manner  that would  avoid  infringement,  could be  modified  to avoid
infringement, or are not material to the Company's business. There can, however,
be no assurance  that  licenses  would be available on terms  acceptable  to the
Company, or its partners,  or at all. If the Company cannot obtain such licenses
and cannot  show such  unlicensed  patents to be invalid or  unenforceable,  the
Company  could  encounter  delays  in  product  market  introductions  and incur
substantial   additional   costs  while  it  attempts  to  design   around  such
intellectual  property  rights,  or it could be prevented from the  development,
manufacture or sale of products  requiring  such licenses.  There also can be no
assurance that any  modifications  effected by the Company in an effort to avoid
infringement  of  certain  patents  would be  successful  or would not result in
infringement of other patents. Moreover, there can be no assurance that all U.S.
patents that may pose a risk of infringement have been identified. Additionally,
the Company has not sought to identify  foreign patent  applications  or patents
which might affect its future  foreign  sales or  operations.  The Company could
incur  substantial  costs in defending  against suits brought against it on such
U.S. or foreign  intellectual  property  rights or  prosecuting  suits which the
Company  brings  against  other  parties to protect  its  intellectual  property
rights. Competitors or potential competitors may have filed applications for, or
have received patents and may obtain additional  patents and proprietary  rights
relating to, compounds or processes  competitive with those of the Company.  The
Company has not reached a final decision as to all details of its  manufacturing
process,  and modifications to that process may increase the patent infringement
risks faced by the Company.

<PAGE> 19

         The Company also relies upon unpatented trade secrets, and there can be
no assurance that others will not independently develop substantially equivalent
proprietary  information  and  techniques,  or  otherwise  gain  access  to  the
Company's  trade  secrets or disclose such  technology,  or that the Company can
meaningfully  protect  its rights to its  unpatented  trade  secrets.  Somatogen
requires  each  of  its  employees,   consultants  and  advisors  to  execute  a
confidentiality  agreement upon the  commencement of an employment or consulting
relationship with the Company.  There can be no assurance,  however,  that these
agreements will provide meaningful protection for the Company's trade secrets in
the event of unauthorized use or disclosure of such information.

Government Regulation

         Regulation  by  governmental   authorities  in  the  U.S.  and  foreign
countries will  significantly  affect the Company's  ability to manufacture  and
market the Company's  products and to conduct the Company's ongoing research and
product  development  activities.  All of  Somatogen's  current and  anticipated
future  products  will require  regulatory  approval by  appropriate  government
agencies before those products can be commercialized. Human therapeutic products
are subject to rigorous  preclinical  and  clinical  testing and other  approval
procedures  by the FDA and  similar  health  authorities  in foreign  countries.
Various  federal,  state and  foreign  statutes  also  govern or  influence  the
manufacture,  safety,  labeling,  storage,  record keeping and marketing of such
products. The process of obtaining these approvals is costly and time-consuming.
Moreover, ongoing compliance with these requirements can require the expenditure
of substantial  resources.  Any failure by the Company or other collaborators or
licensees to obtain, or any delay in obtaining,  required  regulatory  approvals
would adversely  affect the marketing of the Company's  products and its ability
to derive product or royalty revenue.

         Preclinical testing is generally conducted in animal or in vitro models
to  evaluate  the  potential  efficacy  and  safety of a  compound  before it is
administered to humans. The results of these studies are submitted to the FDA as
part of an Investigational New Drug Application ("IND"),  which must be reviewed
before human clinical testing can begin.

         Clinical studies involve the administration of the  investigational new
drug to healthy  subjects and to patients,  under the supervision of a qualified
principal  investigator.  Clinical  studies are conducted  under  protocols that
detail the objectives of the study,  the parameters to be used to monitor safety
and the efficacy/activity criteria to be evaluated. Each protocol and subsequent
amendments  must be submitted to the FDA. In addition,  each clinical study must
be conducted in accordance  with "Good Clinical  Practices" as prescribed by the
FDA.  Each  clinical  study is conducted  under the  auspices of an  independent
Institutional Review Board ("IRB") at the institution at which the study will be
conducted.  The IRB will  consider,  among other things,  ethical  factors,  the
safety  of human  subjects  and  patients,  and the  possible  liability  of the
institution.

         In order to obtain FDA  approval  of Optro,  the  Company  will need to
establish the product's efficacy during its Phase III trials. There currently is
no FDA  established  criteria  for  measuring  efficacy  of an  oxygen  carrying
solution.  Although  the FDA has  indicated  on  several  occasions  that it may
consider the avoidance of donor blood as a surrogate  marker for oxygen carrying
product's efficacy if such avoidance were measured by a suitable clinical trial,
there can be no assurance that the FDA will  ultimately  accept such an efficacy
endpoint.  Commercial introduction of Optro could be delayed or prevented or the
market  restricted  if the Company  were not able to define and achieve in Phase
III trials an efficacy endpoint acceptable to the FDA.

<PAGE> 20

         In the case of  biologic  products  such as the  Company's  recombinant
hemoglobin,  the results of  pharmaceutical  development and the preclinical and
clinical  testing  and  the  results,  data  and  facility  description  must be
submitted to the FDA in the form of a Biologics License Application ("BLA"). The
BLA must be approved before  commercial  sales may begin. The FDA may respond to
the BLA by granting a product license, or by denying the application if it finds
that the application does not meet the criteria for regulatory approval. The FDA
also may  respond by  requiring  the  Company to perform  additional  testing or
supply additional information.  Notwithstanding the submission of such data, the
FDA may ultimately  decide that the  applications  do not satisfy its regulatory
criteria for  licensing.  The testing and approval  process is likely to require
substantial  time and effort.  There can be no assurance  that  approval will be
granted for any of Somatogen's  products on a timely basis, if at all. Somatogen
has made and must continue to make substantial financial commitments in order to
prove safety and efficacy/activity of Optro in humans to receive FDA approval of
Optro.

         In addition to regulations enforced by the FDA, the Company also may be
subject to regulation under the  Occupational  Safety and Health Act, the
Environmental  Protection Act, the Toxic Substances  Control Act, the Resource
Conservation and Recovery Act, the Comprehensive  Environmental  Response Act,
the  Compensation and Liability Act, the National  Environmental  Policy Act,
the Clean Air Act, the Medical Waste Tracking Act, the federal Water Pollution
Control Act and other present and potential future federal, state or local
regulations. See "Manufacturing."

         The regulatory process, which includes preclinical and clinical testing
of each product to establish its safety and efficacy and post-marketing studies,
can take many years and requires the expenditure of substantial resources.  Data
obtained from  preclinical  and clinical  activities are  susceptible to varying
interpretations  which could delay, limit or prevent FDA regulatory approval. In
addition,  delays or  rejections  may be  encountered  based upon changes in FDA
policy during the period of product  development  and FDA  regulatory  review of
each  submitted  new product  license  application.  Similar  delays may also be
encountered in foreign  countries.  Each  manufacturing  facility for a biologic
product,  such as  Optro,  must  also be  licensed  by the FDA.  There can be no
assurance that even after such time and expenditures,  regulatory  approval will
be  obtained  for any  products  developed  by  Somatogen  or any  manufacturing
facility  intended  to  produce  such  products  by the  Company.  Moreover,  if
regulatory  approval  of  a  product  is  granted,   such  approval  may  entail
limitations on the indicated uses for which it may be marketed. Further, even if
such  regulatory  approval is obtained,  a marketed  product,  manufacturer  and
manufacturing   facilities   are  subject  to  continual   review  and  periodic
inspections,  and later discovery of previously unknown problems with a product,
manufacturer  or  facility  may  result  in  restrictions  on  such  product  or
manufacturer,  including  withdrawal of the product from the market.  Failure to
comply with the  applicable  regulatory  requirements  can,  among other things,
result in fines, suspension of regulatory approvals,  product recalls, operating
restrictions  and  criminal  prosecution.   Further,   additional   governmental
regulation may be established  which could prevent or delay regulatory  approval
of the Company's products.

<PAGE> 21

Human Resources

         As of July  31,  1997,  Somatogen  employed  133  individuals,  of whom
approximately 42 hold Ph.D., M.D. or other advanced  degrees.  Of its total work
force, 44 employees are dedicated to  manufacturing,  49 are engaged in research
and  development  activities  and 40 are devoted to support  and  administrative
activities.  A significant  number of the Company's  management and professional
employees  have had  prior  experience  with  pharmaceutical,  biotechnology  or
medical products  companies.  Somatogen  believes that it has been successful in
attracting  skilled and experienced  scientific  personnel and that it maintains
good relations with its  employees.  The Company's  success will depend in large
part upon its  ability to attract  and retain  these and future  employees.  The
Company  faces  competition  in this regard from other  companies,  research and
academic institutions and government entities.

          Somatogen's success is highly dependent on the continued services of a
limited  number of skilled  managers  and  scientists.  The loss of any of these
individuals  could have a material  adverse effect on the Company.  In addition,
the success of the Company will depend  upon,  among other  factors,  successful
recruitment   and  retention  of  additional   highly  skilled  and  experienced
management and technical  personnel.  There can be no assurance that the Company
will be able to retain existing employees, or find, attract or retain additional
personnel   on   acceptable   terms  given  the   competition   among   numerous
pharmaceutical and health care companies,  universities and non-profit  research
institutions of such personnel.

         Somatogen's  anticipated growth and expansion into areas and activities
requiring additional expertise,  such as clinical testing,  government approval,
manufacturing,  sales and marketing,  are expected to place increased demands on
the Company's  resources.  These demands are expected to require the addition of
new management personnel and the development of additional expertise by existing
management  personnel.  The failure to acquire such  services or to develop such
expertise will adversely affect prospects for the Company's success.

<PAGE> 22

Officers

         The officers of the Company and their ages as of August 28, 1997 are as
follows:

Name                              Age   Position

Andre de Bruin..................  50    Chairman of the Board, President and
                                        Chief Executive Officer

Robert F. Caspari, M.D..........  50    Senior Vice President of Medical and
                                        Regulatory Affairs

J. William Freytag, Ph.D........  46    Senior Vice President of Technology
                                        and Business Development

Timothy D. Hoogheem.............  44    Senior Vice President of Finance and
                                        Administration, Chief Financial Officer,
                                        Treasurer and Assistant Secretary

Carol L. Cech, Ph.D.............  49    Vice President of Technology and
                                        Intellectual Property

Richard J. Gorczynski, Ph.D.....  49    Vice President of Research
                                        and Development

Thomas A. Keuer.................  38    Vice President of Operations

Conrad A. McCarty...............  30    Corporate Controller

James C.T. Linfield.............  42    Secretary

     Mr. de Bruin was appointed  President and Chief  Executive  Officer in July
1994 and  appointed  to the  Board of  Directors  in  August  1994.  He also was
appointed  Chairman of the Board in January 1996.  From 1989 until June 1994, he
was Chairman,  President  and Chief  Executive  Officer of  Boehringer  Mannheim
Corporation,  Indianapolis,  Indiana,  a U.S.  subsidiary  of  Corange  Ltd.,  a
private, global healthcare corporation. Mr. de Bruin also serves on the Board of
Directors of  Diametrics  Medical,  Inc.,  and is Vice  Chairman of the Board of
Directors of Quidel Corporation.


<PAGE> 23



     Dr.  Caspari was appointed  Senior Vice President of Medical and Regulatory
Affairs in July 1997. From October 1994 through June 1997, Dr. Caspari served as
the  Company's  Senior  Vice  President  of  Medical  Affairs.  Prior to joining
Somatogen, he served as Vice President of Medical Affairs at Boehringer Mannheim
Corporation,  from August 1991 to October 1994.  Immediately  prior, he held the
position of Executive Director of Research and Development at GynoPharma,  Inc.,
from September 1988 to August 1991. Dr. Caspari was employed at Schering  Plough
from 1987 to April 1988 as Senior Director,  Worldwide  Cardiovascular  Research
and as Senior Director,  International  Clinical Research.  He served in various
positions  at Lederle  Laboratories  from 1982 to 1987,  including  Director  of
Global New Product  Management.  Dr. Caspari  received his M.D. from  Georgetown
University School of Medicine in 1975.

     Dr. Freytag was appointed  Senior Vice President of Technology and Business
Development  in July 1997.  From October 1994  through  June 1997,  Dr.  Freytag
served as the Company's Senior Vice President of Commercial  Development.  Prior
to  joining  Somatogen,  he served as  President  of  Molecular  Diagnostics  at
Boehringer Mannheim Corporation,  from October 1993 to October 1994. Immediately
prior, he held the position of President of Research and  Development  from June
1990 to October 1993.  Dr.  Freytag was employed at DuPont  Medical  Products in
various positions including Research and Development and Commercial  Development
from 1980 to 1990.  Dr.  Freytag  received his Ph.D.  in  biochemistry  from the
University of Kansas Medical Center. He served as a Postdoctoral  Fellow at Duke
University for four years.

         Mr.  Hoogheem  was  appointed  Senior  Vice  President  of Finance  and
Administration in July 1996 and has been Chief Financial Officer since May 1992.
From May 1992 to July 1996, Mr.  Hoogheem served as the Company's Vice President
of Finance.  Mr.  Hoogheem was appointed  Assistant  Secretary in March 1994 and
appointed Treasurer in July 1994. Prior to joining Somatogen, he was employed by
McDATA Corporation,  a network communications  company, from October 1990 to May
1992 as President and Chief  Operating  Officer and from October 1989 to October
1990 as Vice President of Finance and Chief Financial Officer.  Mr. Hoogheem was
employed at Storage Technology Corporation, a computer peripherals manufacturer,
from  March 1978 to  October  1989,  in  various  financial  and  administrative
positions  including  Corporate  Controller,  Assistant  to  the  President  and
Controller of the company's German Operations.

<PAGE> 24

         Dr.  Cech  has been  Vice  President  of  Technology  and  Intellectual
Property  since May 1991.  Dr. Cech served as Director of Special  Projects from
November  1989 to May 1991 with  responsibility  for  intellectual  property and
government  contracts.  From  January  1987 to  November  1989,  she  served  as
Scientific Director of Somatogenetics Instruments,  Inc., a former subsidiary of
Somatogen whose assets were sold to Beckman  Instruments,  Inc. in 1989.  Before
joining  Somatogen,  Dr. Cech was an  Assistant  Professor  of  Chemistry at the
University  of  Colorado  from  1978 to  1986.  Dr.  Cech  received  a Ph.D.  in
biophysical  chemistry at the  University of California,  Berkeley,  in 1975 and
completed  postdoctoral work as a Jane Coffin Childs Fellow in the Department of
Biochemistry and Molecular Biology at Harvard University.

         Dr. Gorczynski was appointed Vice President of Research and Development
in November,  1994. Prior to joining Somatogen,  he served as Senior Director of
Drug Discovery at G.D. Searle from April 1993 to November 1994, where he led the
Cardiovascular  Diseases  Research  Department  and  managed  the  Discovery  to
Development  Product  Transition at Searle. He served in various other positions
at G.D.  Searle from 1985 to 1993,  including  Senior Director of Scientific and
Product  Affairs in the  Licensing  and Business  Development  Group;  Director,
Cardiovascular Diseases Research Department; and Director,  Biological Research.
Prior to Searle,  Dr.  Gorczynski  served as  Section  Head of  Pharmacology  at
American Critical Care from 1983 to 1985. Dr.  Gorczynski  received his Ph.D. in
Physiology at the University of Virginia in 1976.

         Mr. Keuer was appointed Vice President of Operations in July 1997. From
October 1994 through June 1997, Mr. Keuer served as the Company's Vice President
of Manufacturing and Process  Engineering.  He served in various other positions
at Somatogen from 1990 to 1994, including Director of Project Engineering. Prior
to joining Somatogen, he was employed by Monsanto Company from 1980 to September
1990 in various  manufacturing,  process development and engineering  positions,
most recently as an Engineering Specialist for  biotechnology-related  projects.
Mr.  Keuer  received  an  M.S.  degree  in  biochemical  engineering  from  Rice
University in 1984.

         Mr. McCarty has been Corporate Controller since December 1995. Prior to
joining  Somatogen,  he was employed by the accounting firm of Price  Waterhouse
LLP from  December  1991 to December 1995 and held the position of audit manager
immediately prior to joining the Company.  From August 1990 to December 1991, he
held the  position of risk  analyst at RiskCap  Inc.  He is a  Certified  Public
Accountant.

         Mr. Linfield has been Secretary since May 1991. Mr. Linfield has been a
partner of Cooley  Godward  LLP,  counsel to the Company,  since June 1993.  Mr.
Linfield served as Vice President and General Counsel of Somatogen from May 1992
through May 1993,  and Vice  President of Finance from February 1991 to May 1992
and as  Chief  Financial  Officer  from  May 1991 to May  1992.  Before  joining
Somatogen,  he had been a partner of Davis,  Graham & Stubbs, a Denver law firm,
from 1985 to May 1991 (on leave from February  1991 to May 1991).  He received a
J.D.from Harvard Law School in 1980.


<PAGE> 25



Item 2.  Properties

         Somatogen's  administrative  offices,  research  laboratories and pilot
manufacturing  operations  occupy  approximately  76,900  square feet located in
Boulder,   Colorado.  The  Company's  laboratories  are  equipped  for  research
activities in biochemistry,  analytical chemistry and synthetic  chemistry.  The
leases covering these  facilities  expire beginning in January 1998. The Company
anticipates  that its current  facilities  will meet the Company's  research and
development needs through fiscal 1998.

         The  Company  has  a  pilot   manufacturing   facility   consisting  of
approximately  24,000 square feet.  The Company's  lease  covering this facility
expires in October 2001.

         In  September  1992,  the  Company  began  construction  of a  clinical
manufacturing  facility  ("CMF-1"),  which was designed to expand the  Company's
capacity to produce Optro for U.S. and international clinical trials, as well as
support initial commercial  production.  After entering into the Lilly Alliance,
the  Company  reevaluated  its  manufacturing  facility  requirements,  canceled
construction of the CMF-1 facility and recorded a charge of approximately  $29.2
million in fiscal 1994.  The land,  building and related  equipment of CMF-1 and
land intended for construction of a larger commercial manufacturing facility are
being held for sale.

Item 3.  Legal Proceedings

         The Company is not a party to any material legal proceedings.




<PAGE> 26


                                  PART II

Item 5.  Market for Registrant's Common Equity and Related Stockholder Matters

         The Common Stock  (NASDAQ  symbol SMTG) began  trading  publicly in the
over-the-counter market through The Nasdaq Stock Market on August 2, 1991. Prior
to that date,  there was no public  market for the Common  Stock.  The following
table  presents  quarterly  information  on the price range of the Common Stock.
This  information  indicates the high and low sale prices reported by The Nasdaq
Stock  Market.  These  prices  do  not  include  retail  markups,  markdowns  or
commissions.

<TABLE>
<CAPTION>

                                                                                      High               Low
<S>                                                                                  <C>               <C>
Fiscal 1997
   First Quarter................................................................      $14.75           $10.00
   Second Quarter...............................................................       12.38             9.50
   Third Quarter................................................................       14.25             3.00
   Fourth Quarter...............................................................        6.50             4.44
Fiscal 1996
   First Quarter................................................................       26.13            12.88
   Second Quarter...............................................................       21.38            12.13
   Third Quarter................................................................       25.38            16.75
   Fourth Quarter...............................................................       19.13            13.00

</TABLE>

         As of July 31, 1997, there were  approximately  1,186 holders of record
of the Common Stock.

         The  Company  has paid no  dividends  on its  Common  Stock  since  its
inception  and  does  not  plan to pay  dividends  on its  Common  Stock  in the
foreseeable future.

<PAGE> 27



Item 6. Selected Consolidated Financial Data
(In thousands, except per share amounts)

<TABLE>
<CAPTION>

                                                                                                   Period from
                                                                                                  July 10, 1985
                                                      Years ended June 30,                       (inception) to
                                           1997        1996       1995        1994      1993      June 30, 1997
                                           ----        ----       ----        ----      ----      -------------
<S>                                    <C>          <C>        <C>         <C>        <C>         <C>

Statement of Operations Data:

 Revenue                               $       --   $      --  $      --   $     11   $     659    $    6,588
                                        ---------   ---------  ---------   --------   ---------    ----------
 Operating expenses:
    Research and development               20,079      19,849     18,890     18,029      19,859       121,331
    Reimbursements from Lilly              (5,405)     (6,150)    (4,022)        --          --       (15,577)
    Reimbursements to Lilly                 1,133       3,250        100         --          --         4,483
                                         --------   ---------  ---------   --------   ---------    ----------
    Research and development, net          15,807      16,949     14,968     18,029      19,859       110,237
    General, administrative and
     marketing                              3,605       4,150      4,282      4,199       5,466        31,372
    Writedown of manufacturing
     facility assets (1)                       --          --         --     29,194          --        29,194
                                       ----------   ---------  ---------   --------   ---------    ----------
       Total expenses                      19,412      21,099     19,250     51,422      25,325       170,803
                                       ----------   ---------     ------  ---------   ---------    ----------
 Operating loss                           (19,412)    (21,099)   (19,250)   (51,411)    (24,666)     (164,215)
 Interest income and other, net (2)         8,472       3,076      2,146        708       1,326        17,245
                                       ----------  ----------  ---------  ---------   ---------    ----------
 Loss from continuing operations          (10,940)    (18,023)   (17,104)   (50,703)    (23,340)     (146,970)
 Discontinued operations                       --          --         --         --          --          (925)
                                      -----------  ----------  ---------  ---------   ---------    ----------
 Net loss                               $ (10,940)  $ (18,023)  $(17,104) $ (50,703)  $ (23,340)   $ (147,895)
                                      ===========  ==========  =========  =========   =========    ==========
 Loss per share data:
   Loss from continuing operations      $   (0.53)  $   (0.90)  $  (0.94) $   (3.64)  $   (2.37)
                                      ===========  ==========  ========== =========   =========

   Net loss                             $   (0.53)  $   (0.90)  $  (0.94) $   (3.64)  $   (2.37)
                                      ===========  ==========  ========== =========   =========
 Shares used in calculating per
    share data                             20,765      20,075      18,269    13,935       9,852
                                      ===========  ==========  ========== =========   =========


                                                                June 30,
Balance Sheet Data:                         1997        1996      1995       1994       1993
                                            ----        ----      ----       ----       ----

Cash, cash equivalents and short-
 term investments                       $  44,026   $  54,276   $  37,909 $  52,017   $ 22,658
Working capital                            42,458      51,739      35,789    45,446     15,436
Total assets                               56,031      69,161      51,880    65,994     60,368
Long-term debt and capital lease
 obligations                                   --          11         370     1,106      3,079
Deficit accumulated during the
 development stage                       (151,888)   (140,948)   (122,925) (105,821)   (55,118)
Stockholders' equity                       53,598      63,304      47,361    57,803     49,211
</TABLE>

- ----------------
(1)  Reflects   revaluation  of   manufacturing   facilities.   See  Note  2  to
     Consolidated Financial Statements included herein.

(2)  Fiscal 1997  reflects the receipt of $6 million from Lilly  pursuant to the
     strategic alliance termination provisions.


<PAGE> 28



Item 7. Management's Discussion and Analysis of Financial Condition and Results
        of Operations

         Except for the historical  information  contained herein, 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 section and elsewhere
in this Form 10-K.

         Since 1987,  Somatogen  has been a  development  stage  company and has
devoted  substantially  all  of  its  efforts  and  resources  to  research  and
development  related to its recombinant  hemoglobin  technology.  No revenue has
been  generated by Somatogen to date from  commercial  product  sales,  and such
sales are not  expected to commence  for  several  years,  if at all. To achieve
sustained profitable  operations,  Somatogen must successfully  develop,  obtain
regulatory  approval for,  manufacture  and market its products.  The time-frame
necessary  to achieve  market  success  for any  individual  product is long and
uncertain.  There can be no  assurance  that the Company will be able to achieve
profitability at all or on a sustained basis.

         For the  period  from its  inception  to June  30,  1997,  the  Company
incurred a cumulative  net loss of  $147,895,000.  The Company  expects to incur
substantial  and increasing  operating  losses for the next several years as the
Company's products will require significant additional research and development,
including extensive preclinical and clinical testing, before the Company will be
able to apply for and  obtain  approval  from the FDA or  corresponding  foreign
authorities  for any  indication,  if at all. There can be no assurance that the
Company's research and development  efforts will be successful,  that any of the
Company's products under development,  including Optro, will prove to be safe or
effective in clinical trials, that the Company will be able to obtain regulatory
approval to sell any  products,  that the  products  can be  manufactured  at an
acceptable cost and with appropriate quality, or that any products,  if and when
approved, could be successfully marketed.

         Pursuant to a strategic alliance (the "Alliance") between Somatogen and
Eli Lilly and  Company  ("Lilly"),  effective  June 24, 1994 and through May 20,
1997, Lilly was co-developing  Somatogen's lead recombinant  hemoglobin product,
Optro,  sharing in  certain  development  costs and  contributing  advisory  and
support  services.  The Alliance was  terminated  effective  May 20, 1997,  upon
notification from Lilly in March 1997.

<PAGE> 29

Results of Operations

         Fiscal  year ended June 30,  1997  ("fiscal  1997") as  compared to the
fiscal  years ended June 30,  1996  ("fiscal  1996") and June 30, 1995  ("fiscal
1995"):

         Operating Expenses

         For fiscal 1997, total operating expense decreased by 8% to $19,412,000
from  $21,099,000 for fiscal 1996 primarily due to increased net  reimbursements
from Lilly and from lower general,  administrative and marketing  expenses.  For
fiscal 1996,  total  operating  expense  increased by 10% from  $19,250,000  for
fiscal  1995   primarily   due  to  increased   net  research  and   development
expenditures.

         Net research and development expense for fiscal 1997 decreased by 7% to
$15,807,000  from  $16,949,000  in fiscal 1996.  Net  research  and  development
expense for fiscal 1996 increased by 13% from $14,968,000 for fiscal 1995. These
variances are further discussed in the following paragraphs.

         Excluding Lilly  reimbursements,  research and development  expense for
fiscal 1997 increased by 1% to $20,079,000  from $19,849,000 in fiscal 1996. For
fiscal 1996,  excluding Lilly  reimbursements,  research and development expense
increased by 5% from $18,890,000 for fiscal 1995. These increases were primarily
a result of increased expenditures related to process and product development.

         Reimbursements   from  Lilly  for  fiscal  1997  decreased  by  12%  to
$5,405,000  from $6,150,000 in fiscal 1996. This decrease was primarily a result
of decreased reimbursable clinical material manufacturing costs partially offset
by increased  reimbursable  process development  expenditures.  For fiscal 1996,
reimbursements from Lilly increased by 53% from $4,022,000 in fiscal 1995 due to
increased  reimbursable clinical development  expenditures and from an amendment
to the Alliance which provided that,  effective January 1, 1996, certain process
development expenditures would be reimbursable.

         Reimbursements  to Lilly for fiscal 1997 decreased by 65% to $1,133,000
from  $3,250,000  for  fiscal  1996.  This  decrease  was due to a  decrease  in
reimbursable   clinical  and  process   development   costs.  For  fiscal  1996,
reimbursements  to Lilly  increased  from  $100,000  in  fiscal  1995 due to the
sharing of clinical  development  costs and from sharing in process  development
costs which began January 1, 1996 pursuant to an amendment to the Alliance.

         General, administrative and marketing expense for fiscal 1997 decreased
by 13% to  $3,605,000  from  $4,150,000  for  fiscal  1996.  This  decrease  was
primarily a result of lower expenses incurred related to the disposal of certain
assets  held for  sale,  combined  with a  decrease  in  commercial  development
expenditures.  For fiscal 1996,  general,  administrative  and marketing expense
decreased by 3% compared to expenses of $4,282,000 in fiscal 1995.

<PAGE> 30

         Interest Income and Other, Net

         For fiscal 1997, net interest and other income  increased to $8,472,000
from  $3,076,000  in fiscal 1996.  This  increase was the result of a $6,000,000
termination  payment  received from Lilly,  net of a decrease in interest income
due to lower average investment  balances.  For fiscal 1996, net interest income
and other increased from $2,146,000 in fiscal 1995. This increase was the result
of  interest  earned  from  higher  average  cash and  investment  balances  and
decreased interest expense resulting from lower debt and capital lease balances.

         Taxes

         The Company  incurred  losses for federal income tax purposes in fiscal
1997, 1996 and 1995 and therefore incurred no tax liability or expense for any
 of those years.

         At June 30, 1997, the Company had net operating loss  carryforwards for
federal  income tax purposes of  approximately  $122,000,000.  Under the federal
income tax laws,  approximately $3,000,000 of these loss carryforwards cannot be
utilized  due to prior  changes in stock  ownership.  The  remainder of the loss
carryforwards  will expire in the years 2003  through  2012.  Future  changes in
stock  ownership  could result in a further  limitation  on the  utilization  of
present  and future  loss  carryforwards.  The  Company  also has  research  and
development tax credit carryforwards of approximately $4,300,000 which expire in
the years 2001 through 2012.

         Deferred tax assets of  approximately  $59,100,000 have been reduced to
the amount  realizable,  zero, by a valuation  allowance  based on the Company's
history of losses.

<PAGE> 31

Liquidity and Capital Resources

         Somatogen's  operations  to date have consumed  substantial  amounts of
cash.  Negative cash flow from  operations is expected to increase during fiscal
1998  compared  to the levels  experienced  in fiscal  1997,  and to increase in
subsequent  fiscal years as the clinical studies for Optro increase in scope and
the preclinical and clinical  studies of new products are undertaken.  Somatogen
will need to raise  significant  additional funds in order to fund the Company's
future operations and capital  expenditures  prior to  commercialization  of the
Company's  products.  The  Company  has relied  primarily  on public and private
offerings  of equity and cost  sharing  and equity  investments  pursuant to the
Alliance to fund its  operations  and upon  equipment  leasing  arrangements  to
finance the  acquisition of capital  equipment for the Company's  laboratory and
pilot manufacturing facilities.

         At June 30, 1997, the Company had cash, cash equivalents and short-term
investments of $44,026,000.  The Company's cash, cash equivalents and short-term
investments  decreased by  approximately  $10,250,000  during fiscal 1997.  This
decrease was  primarily due to the use of cash for  operations.  Pursuant to the
termination  provisions of the Lilly Alliance,  a revolving credit agreement was
executed  effective July 28, 1997, which provides that the Company may borrow up
to $8,000,000 from Lilly.

         In September  1992, the Company  commenced  construction  of a clinical
manufacturing  facility.  The Company had also  acquired land for, and begun the
design of, a larger  commercial  manufacturing  facility.  In  conjunction  with
entering into the Alliance,  an evaluation of the Company's future manufacturing
requirements  was  completed  and  construction  of the  clinical  manufacturing
facility was discontinued. During the fourth quarter of fiscal 1994, the Company
recognized a non-recurring  charge, which was principally  non-cash,  associated
with the  writedown  of its  clinical  and  commercial  manufacturing  assets of
approximately  $29,200,000.  The components of the charge included approximately
$21,000,000  for the clinical  manufacturing  facility,  $6,000,000  for related
manufacturing  equipment and  approximately  $2,200,000 for  engineering  design
costs for the  proposed  commercial  manufacturing  facility.  Land and building
related to  manufacturing  facilities  and the related  manufacturing  equipment
aggregating  $5,942,000 are  classified in  Somatogen's  balance sheet as assets
held for sale.

         For the year ended June 30,  1997,  the  Company  realized  $504,000 in
proceeds from the sale of clinical  manufacturing  assets.  The Company believes
the  aggregate  carrying  value of all  assets  held for sale  approximates  the
assets'  net  realizable  value;  however,  the  Company  continues  to  monitor
estimated realizable values on a quarterly basis. There can be no assurance that
the Company will realize the aggregate  carrying  value of assets held for sale.
Proceeds from such asset sales are being used for general corporate purposes.

         The  Company  historically  has  leased a  significant  portion  of the
equipment used in its laboratory and pilot manufacturing facilities. At June 30,
1997,  the  Company  had  aggregate  future   operating  lease   obligations  of
approximately  $2,713,000.  The Company spent  $1,256,000  during the year ended
June 30, 1997 for the purchase of capital equipment and leasehold improvements.


<PAGE> 32



         During the fiscal year beginning July 1, 1997, the Company's  operating
requirements  include  increases in research and  development  costs,  including
costs related to clinical studies and product development and manufacturing. The
Company's  capital spending program includes  purchases of additional  equipment
for its research and development  laboratories and pilot manufacturing facility.
In subsequent  fiscal years, the Company's  operating  requirements will include
continuing  increases in research and development  funding to cover the costs of
expanded   preclinical  and  clinical  studies  and  new  product   development,
expenditures  associated  with  commercial  manufacturing,  as well as  general,
administrative, marketing and distribution expenses.

         In order to meet its long-term financing requirements,  the Company may
pursue a number of  financing  alternatives,  including  public  and/or  private
offerings  of  securities  and  strategic  alliances.  The Company is  currently
engaged in preliminary  discussions with potential strategic partners.  However,
there  can be no  assurance  that the  Company  will be able to  enter  into any
strategic  relationships  and/or  raise  additional  financing.  There can be no
assurance that any strategic  relationship which the Company enters into will be
on terms  favorable to the Company,  or that any  additional  funding  which may
become  available to the Company will be on  satisfactory  terms.  The Company's
ability to raise  additional  financing may be dependent on many factors  beyond
the Company's  control,  including the state of the capital markets and the rate
of progress of the Company's clinical studies. Any additional financing that the
Company may be able to obtain could result in  substantial  dilution to existing
stockholders.  If adequate funds are not available, the Company will be required
to significantly curtail operations.  Any such action could impact the Company's
research and  development  programs,  including  the  Company's  clinical  study
program.  Any of these events could  adversely  affect the Company's  ability to
commercialize its products.

         Cash  requirements  for the Company may vary  materially from those now
planned due to results of research and development, results of clinical testing,
changes  in focus  and  direction  of the  Company's  research  and  development
programs,  manufacturing processes,  competitive and technological advances, the
FDA  regulatory  process,  changes in the Company's  marketing and  distribution
strategy and other factors.


Item 8.  Financial Statements and Supplementary Data

         Financial  Statements appear on pages 44-63 of this Annual Report on
Form 10-K.


<PAGE> 33



                                    PART III

Item 10. Directors and Executive Officers

         The  information  required by this item (with  respect to Directors) is
incorporated  by reference from the information  under the caption  "Election of
Directors"  contained in the registrant's Proxy Statement for the Annual Meeting
of Stockholders to be held on October 28, 1997.

         The required  information  concerning Executive Officers of the Company
is contained in Item 1, "Description of Business -- Officers."

         The required  information  concerning  compliance with Section 16(a) of
the  Securities  Exchange  Act of 1934 is  incorporated  by  reference  from the
registrant's  Proxy  Statement for the Annual Meeting of Stockholders to be held
on October 28, 1997.


Item 11. Executive Compensation

         Incorporated by reference from the registrant's Proxy Statement for the
Annual Meeting of Stockholders to be held on October 28, 1997.


Item 12. Security Ownership of Certain Beneficial Owners and Management

         Incorporated by reference from the registrant's Proxy Statement for the
Annual Meeting of Stockholders to be held on October 28, 1997.

Item 13.  Certain Relationships and Related Transactions

         Incorporated  by reference from  registrant's  Proxy  Statement for the
Annual Meeting of Stockholders to be held on October 28, 1997.



<PAGE> 34


                                     PART IV

Item 14.  Exhibits, Financial Statement Schedules and Reports on Form 8-K

(a-1) Financial Statements

The following  consolidated  financial statements of the registrant are filed as
Appendix F to this Annual Report on Form 10-K:
<TABLE>
<CAPTION>
<S>                                                                                       <C>
                                                                                          Page
Report of Price Waterhouse LLP, Independent Accountants                                    43

Consolidated Balance Sheet at June 30, 1997 and 1996                                       44

Consolidated  Statement of Operations  for each of the three years in the period
ended June 30, 1997 and for the period from July 10,  1985  (inception)  to 
June 30, 1997                                                                              45

Consolidated Statement of Stockholders' Equity for the period from July 10, 1985
(inception) to June 30, 1997                                                               46

Consolidated  Statement  of Cash Flows for each of the three years in the period
ended June 30, 1997 and for the period from July 10,  1985  (inception)  to 
June 30, 1997                                                                              48

Notes to Consolidated Financial Statements                                                 51

</TABLE>

(a-2) The  exhibits  to this  Annual  Report on Form 10-K are listed  under item
14(c) below.

<PAGE> 35

The following management  compensatory plans and arrangements are required to be
filed as exhibits to this Annual Report on Form 10-K pursuant to Item 14(c):

         Exhibit
         Number       Description

         10.2         Registrant's Stock Option Plan as amended (the "Plan").(1)
         10.3         Form of Incentive Stock Option under the Plan. (2)
         10.4         Form of Nonstatutory Stock Option under the Plan. (2)
         10.25        Registrant's Employee Stock Purchase Plan and related
                      offering document. (2)
         10.40        Non-Employee Director Stock Option Plan. (3)
         10.63        Consultants Stock Option Plan. (4)
         10.69        Amendment to the Somatogen, Inc. Amended and Restated
                      Stock Option Plan (5)

         (1)   Previously  filed  with  the  Commission  as an  exhibit  to  the
               Company's  Registration Statement on Form S-1 (File No. 33-48789)
               and incorporated by reference thereto.

         (2)   Previously  filed  with  the  Commission  as an  exhibit  to  the
               Company's  Registration Statement on Form S-1 (File No. 33-41229)
               and incorporated by reference thereto.

         (3)   Previously  filed  with  the  Commission  as an  exhibit  to  the
               Company's  Annual Report on Form 10-K for the year ended June 30,
               1993 and incorporated herein by reference thereto.

         (4)   Previously  filed  with  the  Commission  as an  exhibit  to  the
               Company's  Annual Report on Form 10-K for the year ended June 30,
               1995 and incorporated herein by reference thereto.

         (5)   Previously  filed as an  exhibit  to the  Company's  Registration
               Statement  on Form S-8 dated  November  6, 1996 and  incorporated
               herein by reference thereto.

  (b)    Reports on Form 8-K

         The  registrant  filed  a  Report  on Form  8-K  on  June  10,  1997,
         concerning the adoption of a preferred share purchase rights plan.

  (c)     Exhibits

<PAGE> 36

Exhibit
Numbers           Description

      3.1         Amended and Restated Certificate of Incorporation.(1)
      3.3         Bylaws.(1)
      4.1         Reference is made to Exhibits 3.1 and 3.3.(1)
      4.2         Amended  and  Restated  Registration   Agreement  between  the
                  Registrant  and the parties named  therein,  dated as of March
                  28, 1990, as amended.(1)
      4.3         Reference is made to Exhibit 10.8.(1)
      4.4         Amendment to the Amended and Restated Registration  Agreement,
                  dated as of June 14,  1991,  between  the  Registrant  and the
                  parties named therein.(1)
      4.5         Specimen Common Stock certificate.(1)
     10.1         Form of  Indemnification  Agreement  entered  into between the
                  Registrant   and  its  directors  and  officers  with  related
                  schedule.(2)
     10.2         Registrant's  Stock Option Plan as amended (the "Plan").(2) 
     10.3         Form of Incentive  Stock Option  under the  Plan.(1)  
     10.4         Form of  Nonstatutory Stock  Option  under the  Plan.(1)  
     10.5         Employment  and  Executive  Stock Agreement between the
                  Registrant and Charles H. Scoggin dated October 13, 1988. (1)
     10.6         Purchase  Agreement  between the Registrant and parties named
                  therein, dated as of October 28, 1988.(1)
     10.7         Series  B  Preferred  Stock  Purchase  Agreement  between  the
                  Registrant  and the parties named  therein,  dated as of March
                  28, 1990.(1)
     10.8         Amendment  to Series B  Preferred  Stock  Purchase  Agreement,
                  dated as of February 22, 1991,  between the Registrant and the
                  parties named therein.(1)
     10.9         Amendment to Preferred Stock Purchase Agreements,  dated as of
                  June 14, 1991,  between the  Registrant  and the parties named
                  therein.(1)
     10.19        Lease Agreement between the Registrant and 2545 Central Avenue
                  Partnership  ("Central"),  dated  as of  April  13,  1990,  as
                  amended.(2)
     10.20        Lease Agreement  between the Registrant and Central,  dated as
                  of  September  21,  1990.(1)  
     10.21        Master  Lease and Warrant
                  Agreement between the Registrant and Pacific,  as the Equitec,
                  dated as of March 31, 1989.(1)
     10.22        Master Lease and Warrant Agreement between the Registrant
                  and  Pacific,  dated as of May 2, 1990.(1)
     10.23        Master Lease  Agreement  between the  Registrant and Dominion,
                  dated  as of June 29,  1990.(1)  
     10.25        Registrant's  Employee Stock Purchase Plan and related 
                  offering document.(1)
     10.26        Master  Lease  Agreement  between the  Registrant  and General
                  Electric Capital Corporation,  dated as of March 19, 1992, and
                  accompanying  Letter of Credit, as amended,  dated as of March
                  30, 1992, and Promissory Note, Master Security Agreement,  and
                  Cross Collateral Agreement, dated as of May 22, 1992.(2)
     10.27        Lease/Option  Agreement between the Registrant and the parties
                  named therein, dated as of November 26, 1991, as amended (with
                  certain confidential information in brackets deleted).(2)

<PAGE> 37

     10.28        Purchase  Agreement  between  the  Registrant  and the parties
                  named therein, dated as of November 26, 1991, as amended (with
                  certain confidential information in brackets deleted).(2)
     10.29        Engineering,  Procurement and Validation Service Agreement for
                  Commercial  Manufacturing Facility No. 1 between the
                  Registrant and Fluor Daniel, Inc., dated as of April 1, 1992
                  (with certain confidential information in brackets deleted)(2)
     10.30        Engineering, Procurement and Validation Services  Agreement
                  for Commercial Manufacturing Facility No. 2 between the
                  Registrant and Fluor Daniel, Inc., dated as of April 1, 1992
                  (with certain confidential information in brackets deleted)(2)
     10.31        Form of warrant with related schedule.(2)
     10.33        Letter agreement dated July 9, 1992 between the Registrant and
                  General  Electric  Capital  Corporation,  amending  the Master
                  Lease  Agreement  between the Registrant and General  Electric
                  Capital Corporation, dated as of March 19, 1992.(2)
     10.34        Lease Agreement between the Registrant and Central, dated as
                  of November 25, 1991.(3)
     10.35        Deed of Trust Note to Flatiron  Industrial Park Co. and
                  related  Warranty Deed dated September 2, 1992.(3)
     10.36        Water and  Wastewater  Service  Agreement  between the City of
                  Boulder and the Company dated as of September 28, 1992.(4)
     10.38        Construction  Management  Services  Agreement  for  Commercial
                  Manufacturing  Facility  No. 1 between  the  Company and Fluor
                  Daniel,  Inc.,  dated  as of  August  1,  1992  (with  certain
                  confidential information deleted) and related letter agreement
                  dated December 1, 1992 (with certain confidential  information
                  deleted).(5)
     10.39        Letter agreement dated October 9, 1992 between the Company and
                  Comdisco Electronics Group regarding lease financing
                  commitment.(5)
     10.40        Non-Employee  Director  Stock  Option  Plan.(6) 
     10.41        Master lease agreement dated April 28, 1993 between Registrant
                  and BancBoston. (6)
     10.42        Amendment to the  Engineering  Procurement  and  Validation
                  Services Agreement for Commercial Manufacturing Facility
                  No. 1, between the Company and Fluor Daniel,  Inc.,
                  dated as of April 1, 1994 (with certain confidential
                  information in brackets deleted). (7)
     10.43        Amendment to the Construction  Management  Services  Agreement
                  for  Commercial  Manufacturing  Facility  No.  1  between  the
                  Company  and  Fluor  Daniel,  Inc.,  dated as of April 1, 1994
                  (with   certain    confidential    information   in   brackets
                  deleted).(7)
     10.44        Agreement  dated June 24, 1994,  among  Somatogen,  Inc.,  Eli
                  Lilly and Company,  and Lilly Industries Limited (with certain
                  confidential information in brackets deleted). (8)
     10.45        Amendment  dated  June 24,  1994,  among  Somatogen,  Inc.,
                  Eli  Lilly  and  Company  and  Lilly Industries Limited. (8)
     10.46        Stock Purchase  Agreement  between  Somatogen,  Inc., Eli
                  Limited. (8)
     10.47        Form of Severance Agreement entered into between the
                  Registrant  and certain of its  Executive Officers with
                  Related Schedule. (8)

<PAGE> 38

     10.48        Key Employee Agreement for Andre de Bruin, dated July 13,
                  1994. (10)
     10.49        Letter of Employment for J. W. Freytag, dated September 28,
                  1994. (10)
     10.50        Letter of Employment for Robert F. Caspari, dated October 14,
                  1994. (10)
     10.51        Letter of Employment for Richard J. Gorczynski, dated
                  November 14, 1994. (10)
     10.52        Promissory  Note of J.  William  Freytag for the benefit of
                  the Registrant, dated  November 21, 1994. (10)
     10.53        Promissory Note of Robert F. Caspari for the benefit of the
                  Registrant dated December 14, 1994. (10)
     10.54        Consulting Agreement for Charles H. Scoggin, dated January 18,
                  1995. (10)
     10.55        Lease  Agreement  dated  February  14,  1995 with  Central
                  for portion of 2545 Central Avenue, Boulder, Colorado. (11)
     10.56        Lease  Agreement  dated  February  14,  1995  with  Central
                  for 2590 Central Avenue, Boulder, Colorado. (11)
     10.57        Lease  Agreement  dated  February  14,  1995  with  Central
                  for 5797 Central Avenue, Boulder, Colorado. (11)
     10.58        Lease  Renewal  Amendment  dated  December  29, 1994 to the
                  Master Lease Agreement with General Electric Capital
                  Corporation dated March 19, 1992. (11)
     10.59        Lease Renewal Contract dated December 29, 1994 with Ellco
                  Leasing Corporation. (11)
     10.60        Exclusive Agency Agreement dated March 30, 1995 with
                  Binswanger Chesterton. (11)
     10.61        Promissory  Note of Richard  Gorczynski  for the benefit of
                  the Registrant dated July 13, 1995. (12)
     10.62        Consulting Agreement with Ralph Snyderman, M.D., dated
                  October 24, 1994. (12)
     10.63        Consultants Stock Option Plan. (12)
     10.64        Stock Purchase Agreement between Somatogen, Inc. and
                  Eli Lilly and Company, dated as of September 18, 1995. (13)
     10.65        Amendment No. 1 to the Stock Purchase Agreement between
                  Somatogen, Inc. and Eli Lilly and Company dated June 29,
                  1994. (13)
     10.66        Amendment No. 3 to the Agreement between  Somatogen,  Inc. and
                  Eli Lilly and Company  dated June 24, 1994,  and  subsequently
                  amended  on June  24,  1994  and  May 4,  1995  (with  certain
                  confidential information in brackets deleted). (13)
     10.67        Promissory Note of Fiona Wood for the benefit of the
                  Registrant dated July 30, 1996. (14)
     10.68        Amendment dated July 1, 1996 to Exclusive Agency Agreement
                  with Binswanger Chesterton. (15)
     10.69        Amendment to the Somatogen, Inc. Amended and Restated Stock
                  Option Plan. (16)
     10.70        Lease Extension  Agreement dated January 21, 1997 with Central
                  for 2545 Central Avenue, Boulder, Colorado.(17)
     10.71        Lease  Extension  Agreement dated January 21, 1997 with Centra
                  for 2590 Central Avenue, Boulder, Colorado.(17)
     10.72        Lease Extension  Agreement dated January 21, 1997 with Central
                  for 5797 Central Avenue, Boulder, Colorado.(17)
     10.73        Rights Agreement dated as of June 5, 1997.(18)
     10.74        Revolving  Credit  Facility  Agreement  dated  as of July 28,
                  1997  (with  certain  confidential   information  in  brackets
                  deleted).
     10.75        Amendment dated July 23, 1997 to Exclusive Agency Agreement
                  with Binswanger Chesterton.
     10.76        Form  of   Retention   Agreement   entered  into  between  the
                  Registrant and certain Executive Officers.

<PAGE> 39

     16.1         Letter Re: Change in Certifying Accountant. (9)
     23.1         Consent of Price Waterhouse LLP, Independent Accountants.
     24.1         Power of Attorney.  Reference is made to page 41.
     27.1         Financial Data Schedule (submitted only to the SEC in
                  electronic format).

(1)   Previously  filed  with the  Commission  as an  exhibit  to the  Company's
      Registration  Statement on Form S-1 (File No.  33-41229) and  incorporated
      herein by reference thereto.

(2)   Previously  filed  with the  Commission  as an  exhibit  to the  Company's
      Registration  Statement on Form S-1 (File No.  33-48789) and  incorporated
      herein by reference thereto.

(3)   Previously filed with the Commission as an exhibit to the Company's Annual
      Report  on Form 10-K for the year  ended  June 30,  1992 and  incorporated
      herein by reference thereto.

(4)   Previously  filed as an exhibit to the Company's  Quarterly Report on Form
      10-Q for the quarter ended September 30, 1992 and  incorporated  herein by
      reference thereto.

(5)   Previously  filed as an exhibit to the Company's  Quarterly Report on Form
      10-Q for the quarter ended  December 31, 1992 and  incorporated  herein by
      reference thereto.

(6)   Previously filed with the Commission as an exhibit to the Company's Annual
      Report  on Form 10-K for the year  ended  June 30,  1993 and  incorporated
      herein by reference thereto.

(7)   Previously  filed as an exhibit to the Company's  Quarterly Report on Form
      10-Q for the  quarter  ended  March 31,  1994 and  incorporated  herein by
      reference thereto.

(8)   Previously filed as an exhibit to the Company's Annual Report on Form 10-K
      for the year  ended June 30,  1994 and  incorporated  herein by  reference
      thereto.

(9)   Previously  filed as an exhibit to the Company's  Form 8-K filed on August
      24, 1994 and incorporated herein by reference thereto.

(10)  Previously  filed as an exhibit to the Company's  Quarterly Report on Form
      10-Q for the quarter ended  December 31, 1994 and  incorporated  herein by
      reference thereto.

<PAGE> 40

(11)  Previously  filed as an exhibit to the Company's  Quarterly Report on Form
      10-Q for the  quarter  ended  March 31,  1995 and  incorporated  herein by
      reference thereto.

(12)  Previously filed as an exhibit to the Company's Annual Report on Form 10-K
      for the year  ended June 30,  1995 and  incorporated  herein by  reference
      thereto.

(13)  Previously  filed with the  Commission as an exhibit to Amendment No. 1 to
      Schedule 13D filed by Eli Lilly and Company (File No. 5-42128) on
      November 9, 1995 and incorporated herein by reference thereto.


(14)  Previously  filed with the  Commission  as exhibit  10.64 to the Company's
      Annual  Report  on  Form  10-K  for the  year  ended  June  30,  1996  and
      incorporated herein by reference thereto.

(15)  Previously  filed with the  Commission  as exhibit  10.65 to the Company's
      Annual  Report  on  Form  10-K  for the  year  ended  June  30,  1996  and
      incorporated herein by reference thereto.

(16)  Previously  filed with the  Commission  as an exhibit to the Company's S-8
      Registration  Statement dated November 6, 1996 and incorporated  herein by
      reference thereto.

(17)  Previously filed as an exhibit to the Company's Annual Report on Form 10-Q
      for the  period  ended  December  31,  1996  and  incorporated  herein  by
      reference thereto.

(18)  Previously filed as an exhibit to the Company's Form 8-K filed on June 10,
      1997 and incorporated herein by reference thereto.



<PAGE> 41



                                   SIGNATURES

         Pursuant to the  requirements  of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this Form 10-K to be signed
on its behalf by the undersigned,  thereunto duly authorized on the 11th day of
September, 1997.

                                 SOMATOGEN, INC.

                                           By:  Andre de Bruin
                                                ---------------
                                           Chairman of the Board, President and
                                                Chief Executive Officer
                                             (Principal executive officer)


                                POWER OF ATTORNEY

         KNOW  ALL MEN BY THESE  PRESENTS,  that  each  person  whose  signature
appears below  constitutes  and appoints Andre de Bruin and Timothy D. Hoogheem,
or  either  of  them,  his or her  attorney-in-fact,  each  with  the  power  of
substitution,  for him or her in any and all capacities,  to sign any amendments
to this Report,  and to file the same, with exhibits thereto and other documents
in connection  therewith,  with the Securities and Exchange  Commission,  hereby
ratifying and confirming all that each of said attorneys-in-fact,  or his or her
substitute or substitutes, may do or cause to be done by virtue hereof.

         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>

Signature                                   Title                                  Date
<S>                                         <C>                                    <C>

Andre de Bruin                              Chairman of the Board, President        September 11, 1997
                                            and Chief Executive Officer
                                            (Principal executive officer)


Timothy D. Hoogheem                         Senior Vice President of                September 11, 1997
                                            Finance and Administration,
                                            Chief Financial Officer
                                            and Treasurer
                                            (Principal financial officer)


Conrad  A. McCarty                          Corporate Controller                    September 11, 1997
                                            (Principal accounting officer)

</TABLE>


<PAGE> 42

<TABLE>
<CAPTION>


Signature                       Title             Date

<S>                            <C>                <C>



Carlos Ferrer                   Director          September 11, 1997



Bernadine Healy                 Director          September 11, 1997



Gene I. Miller                  Director          September 11, 1997



George B. Rathmann, Ph.D.       Director          September 11, 1997



Jack W. Schuler                 Director          September 11, 1997



Ralph Snyderman, M.D.           Director          September 11, 1997


</TABLE>


<PAGE> 43






                        REPORT OF INDEPENDENT ACCOUNTANTS




To the Board of Directors and Stockholders of
Somatogen, Inc.


In our opinion,  the  accompanying  consolidated  balance  sheet and the related
consolidated statements of operations, of stockholders' equity and of cash flows
present fairly, in all material  respects,  the financial position of Somatogen,
Inc. (a development stage enterprise) at June 30, 1997 and 1996, and the results
of their  operations  and their  cash flows for the three  years  ended June 30,
1997,  1996 and 1995 and for the period from  inception  (July 10, 1985) to 
June 30, 1997, in conformity with generally  accepted  accounting  principles.  
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 of these  statements in accordance  with
generally accepted auditing standards which require that we plan and perform the
audits 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,
assessing the  accounting  principles  used and  significant  estimates  made by
management,  and evaluating the overall  financial  statement  presentation.  We
believe  that our audits  provide a reasonable  basis for the opinion  expressed
above.



PRICE WATERHOUSE LLP


Boulder, Colorado
July 25, 1997





<PAGE> 44

<TABLE>
<CAPTION>
                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

                           CONSOLIDATED BALANCE SHEET
               (In thousands, except share and per share amounts)

                                     ASSETS
                                                             June 30,         June 30,
                                                               1997             1996
                                                               ----             ----
<S>                                                         <C>             <C>
Current assets:
  Cash and cash equivalents                                 $   24,868      $  29,541
  Short-term investments                                        19,158         24,735
  Receivable from Lilly                                             --          1,852
  Other receivables                                                483          1,013
  Prepaid expenses and other current assets                        382            444
                                                            ----------      ---------
     Total current assets                                       44,891         57,585
Property and equipment, at cost, net of
  accumulated depreciation and amortization                      3,842          4,042
Assets held for sale                                             5,942          6,446
Other assets, net                                                1,356          1,088
                                                            ----------      ---------
                                                            $   56,031      $  69,161
                                                            ==========      =========

                      LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable                                          $    1,363      $   1,826
  Accrued payroll and payroll related                              543            801
  Payable to Lilly                                                 100          2,454
  Other accrued liabilities                                        427            603
  Current portion of long-term debt
     and capital lease obligations                                  --            162
                                                            ----------      ---------
       Total current liabilities                                 2,433          5,846
Long-term debt and capital lease obligations                        --             11
                                                            ----------      ---------
       Total liabilities                                         2,433          5,857
                                                            ----------      ---------
Commitments and contingencies
Stockholders' equity:
  Preferred stock, $.001 par value, 10,000,000
    shares authorized, no shares issued or outstanding              --             --
Common stock, $.001 par value, 35,000,000
    shares authorized, 20,865,362 and 20,684,970
    shares issued and outstanding at June 30, 1997
    and 1996, respectively                                          21             21
  Additional paid-in capital                                   205,652        204,518
  Deficit accumulated during the development stage            (151,888)      (140,948)
  Deferred compensation related to grant of stock options         (187)          (287)
                                                            ----------      ---------
       Total stockholders' equity                               53,598         63,304
                                                            ----------      ---------
                                                            $   56,031      $  69,161
                                                            ==========      =========
</TABLE>

See accompanying notes to consolidated financial statements.


<PAGE> 45
<TABLE>
<CAPTION>

                                           SOMATOGEN, INC.
                                (A Corporation in the Development Stage)
                                  CONSOLIDATED STATEMENT OF OPERATIONS
                           (In thousands, except share and per share amounts)

                                                    Year ended June 30,                          Period From
                                                                                                July 10, 1995
                                        ------------------------------------------------        (inception to)
                                           1997               1996          1995                June 30, 1997
                                           ----               ----          ----                -------------
<S>                                     <C>              <C>               <C>               <C>
Revenue:
   Technology disclosure and
      license fees                                                                            $      4,904
   Research and development
      grants and contracts                       --                --               --               1,684
                                        -----------       -----------     ------------        ------------
         Total revenue                           --                --               --               6,588
                                        -----------       -----------     ------------        ------------
Operating expenses:
   Research and development             $    20,079       $    19,849     $     18,890             121,331
   Reimbursements from Lilly                 (5,405)           (6,150)          (4,022)            (15,577)
   Reimbursements to Lilly                    1,133             3,250              100               4,483
                                        -----------       -----------     ------------        ------------
   Research and development, net             15,807            16,949           14,968             110,237
   General, administrative
       and marketing                          3,605             4,150            4,282              31,372
   Writedown of manufacturing
       facility assets                           --                --               --              29,194
                                        -----------       -----------     ------------        ------------
         Total operating expenses            19,412            21,099           19,250             170,803
                                        -----------       -----------     ------------        ------------
Operating loss                              (19,412)          (21,099)         (19,250)           (164,215)

Interest income and other, net                8,472             3,076            2,146              17,245
                                        -----------       -----------     ------------        ------------
Loss from continuing operations             (10,940)          (18,023)         (17,104)           (146,970)

Discontinued operations:
   Loss from operations
       of subsidiary                             --                --               --              (1,225)
   Gain on sale of subsidiary                    --                --               --                 300
                                        -----------       -----------      -----------        ------------
Net loss                                $   (10,940)      $   (18,023)     $   (17,104)       $   (147,895)
                                        ===========       ===========      ===========        ============

Net loss per share                      $     (0.53)      $     (0.90)     $     (0.94)
                                        ===========       ===========      ===========
Shares used in calculating
    per share data                       20,765,000        20,075,000       18,269,000
                                        ===========       ===========      ===========

</TABLE>

See accompanying notes to consolidated financial statements.

<PAGE> 46


                                  SOMATOGEN, INC.
                      (A Corporation in the Development Stage)

               CONSOLIDATED  STATEMENT OF  STOCKHOLDERS'  EQUITY  
                (In thousands, except share and per share amounts)

<TABLE>
<CAPTION>




                                                                        Deficit      Deferred
                                                                      accumulated  compensation
                                                          Additional   during the   related to      Total
                                      Common Stock         paid-in    development    grant of    stockholders'
                                   Shares       Amount     capital       stage       options        equity
                                   ------       ------    ----------  -----------  ------------  -----------
<S>                              <C>              <C>       <C>          <C>           <C>        <C>

Balances accumulated from
  July 10, 1985 (inception)
  through June 30, 1994          17,406,995       $17     $163,747   $(105,821)     $(140)      $ 57,803

Issuance of 381,463 shares of
  common stock upon exercise of
  stock options for cash at $0.40
  to $9.75 per share                381,463        --          299          --         --            299

Issuance of 710,750 shares of
  common stock to Lilly             710,750         1        5,999          --         --          6,000

Other                                52,813        --          223          --        140            363

Net loss                                 --        --           --     (17,104)        --        (17,104)
                                 ----------       ---       ------    --------      -----        -------

Balance, June 30, 1995           18,552,021        18      170,268    (122,925)        --         47,361


</TABLE>

See accompanying notes to consolidated financial statements.







<PAGE> 47

<TABLE>
<CAPTION>

                                  SOMATOGEN, INC.
                      (A Corporation in the Development Stage)

                CONSOLIDATED  STATEMENT OF STOCKHOLDERS' EQUITY  (CONTINUED)
                   (In thousands, except share and per share amounts)



                                                                        Deficit      Deferred
                                                                      accumulated  compensation
                                                          Additional   during the   related to      Total
                                      Common Stock         paid-in    development    grant of    stockholders'
                                   Shares       Amount     capital       stage       options        equity
                                   ------       ------    ----------  -----------  ------------  -----------
<S>                              <C>              <C>       <C>          <C>           <C>        <C>

Issuance of 258,751  shares of 
  common stock upon  exercise of 
  stock  options for cash at 
  $0.40 to $18.50 per share and
  exchange of 5,000 warrants      263,751          --         773            --          --            773

Issuance of 420,685 shares of
  common stock to Lilly           420,685           1       8,999            --          --          9,000

Issuance of 1,400,000 shares of
  common stock, net of issuance
  costs of $1,735               1,400,000           2      23,464            --          --         23,466

Other                              48,513          --       1,014            --        (287)           727

Net loss                               --          --          --       (18,023)         --        (18,023)
                               ----------         ---    --------     ---------       -----        --------

Balance, June 30, 1996         20,684,970          21     204,518      (140,948)       (287)        63,304


Issuance of 106,229 shares of
  common stock upon exercise of
  stock options for cash at
  $1.20 to $12.75 per share       106,229          --         634            --          --            634

Other                              74,163          --         500            --         100            600

Net loss                               --          --          --       (10,940)         --        (10,940)
                               ----------         ---    --------     ---------       -----        --------

Balance, June 30, 1997         20,865,362         $21    $205,652     $(151,888)      $(187)        $53,598
                               ==========         ===    ========     =========       =====         =======


</TABLE>

See accompanying notes to consolidated financial statements.


<PAGE> 48



                                  SOMATOGEN, INC.
                      (A Corporation in the Development Stage)

                          CONSOLIDATED STATEMENT OF CASH FLOWS
                    Increase (Decrease) in Cash and Cash Equivalents
                                   (In thousands)
<TABLE>
(Caption>

                                                                             Period From
                                                                            July 10, 1985
                                             Year ended June 30,            (inception) to
                                     1997           1996       1995         June 30, 1997
                                     ----           ----       ----         -------------
<S>                                 <C>            <C>         <C>           <C>

Cash flows provided by (used in) 
operating activities:
Net loss                            $(10,940)      $(18,023)   $(17,104)      $(147,895)
Adjustments to reconcile net loss
    to net cash used in operating
    activities:
  Depreciation and amortization        1,685          1,928       2,504          16,452
  Writedown of manufacturing
    facility assets                       --             --          --          29,194
  Other                                  251            418         192           1,213
Changes in assets and liabilities:
  Receivables                          2,382         (1,265)     (1,247)           (321)
  Prepaid expenses and other
    current assets                        62            (15)       (106)           (357)
  Accounts payable and accrued
    liabilities                       (3,251)         2,700      (1,848)          2,584
  Other, net                               2             (3)          6             330
                                     -------      ---------     -------         -------
    Net cash used in operating
        activities                    (9,809)       (14,260)    (17,603)        (98,800)
                                     -------      ---------     -------         -------


</TABLE>

See accompanying notes to consolidated financial statements.










<PAGE> 49


                                  SOMATOGEN, INC.
                      (A Corporation in the Development Stage)

                    CONSOLIDATED STATEMENT OF CASH FLOWS (CONTINUED)   
                    Increase (Decrease) in Cash and Cash Equivalents
                                   (In thousands)    
<TABLE>
(Caption>

                                                                             Period From
                                                                            July 10, 1985
                                             Year ended June 30,            (inception) to
                                     1997           1996       1995         June 30, 1997
                                     ----           ----       ----         -------------
<S>                                 <C>            <C>          <C>          <C>
Cash flows provided by (used in)
  investing activities:
  Purchases of short-term
    investments                     (59,718)        (66,723)    (29,651)     (308,679)
  Proceeds from sale of short-term
    investments                      65,295          53,521      42,501       289,521
  Purchases of property and
    equipment                        (1,256)         (2,009)     (2,132)      (23,511)
  Proceeds from sale of property
    and equipment                       532             971       1,711         3,310
  Additions to construction-
    in-progress                          --              --          --       (18,956)
  Other, net                           (397)           (521)       (200)       (9,283)
                                    -------        --------     -------     ---------
      Net cash provided by (used in)
       investing activities           4,456         (14,761)     12,229       (67,598)
                                    -------        --------     -------     ---------

Cash flows provided by (used in)
  financing activities:
  Payments of capital lease
    obligations and long-term debt    (173)          (1,362)     (2,233)      (10,467)
  Net proceeds from issuance of
    stock and warrants                 853           33,548       6,349       198,214
  Other, net                            --               --          --         3,519
                                   -------        ---------     -------     ---------
      Net cash provided by
       financing activities            680           32,186       4,116       191,266
                                   -------        ---------     -------     ---------
</TABLE>

See accompanying notes to consolidated financial statements.

<PAGE> 50


                                  SOMATOGEN, INC.
                      (A Corporation in the Development Stage)

                    CONSOLIDATED STATEMENT OF CASH FLOWS (CONTINUED)  
                    Increase (Decrease) in Cash and Cash Equivalents
                                   (In thousands)
<TABLE>
<CAPTION>

                                                                             Period From
                                                                            July 10, 1985
                                             Year ended June 30,            (inception) to
                                     1997           1996       1995         June 30, 1997
                                     ----           ----       ----         -------------
<S>                                <C>              <C>        <C>          <C>

Net increase (decrease) in
  cash and cash equivalents        (4,673)            3,165     (1,258)       24,868

Cash and cash equivalents at
  beginning of period              29,541            26,376     27,634            --
                                 --------          --------   --------       -------

Cash and cash equivalents at
  end of period                  $ 24,868          $ 29,541   $ 26,376       $24,868
                                 ========          ========   ========       =======


Supplemental disclosures of cash flow information:
    Cash paid for interest       $     19          $    111   $    265       $ 2,399
    Capital lease obligations
      incurred for purchase of
      property and equipment     $     --          $     --   $    560       $ 5,318
    Equipment deposits transferred
      to net property, plant and
      equipment                  $     --          $     --   $     --       $ 3,423
    Net property, plant and
      equipment transferred to
      assets held for sale       $     --          $     --   $     --       $ 9,541

</TABLE>

See accompanying notes to consolidated financial statements.




<PAGE> 51



                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Note 1.  Organization

     Somatogen,  Inc. (the  "Company")  was  organized in 1985.  The Company has
devoted  substantially  all of its efforts and resources  since 1987 to research
and  development  related  to  its  recombinant  hemoglobin  technology  and  is
considered to be in the development stage. The Company was reincorporated in the
State  of  Delaware  in  March  1989.  The  Company's   corporate  research  and
development  offices  and pilot  production  facility  are  located in  Boulder,
Colorado.


Note 2.  Summary of significant accounting policies

     Principles of consolidation:

     The accompanying  consolidated financial statements include the accounts of
the Company and its previously owned  subsidiary.  All significant  intercompany
transactions and accounts have been eliminated in consolidation.

     Significant 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  and  disclosure  of assets and
liabilities as of the date of the financial  statements and the reported amounts
of  expenses  during  the  periods.  Significant  estimates  have  been  made by
management in the preparation of these financial statements,  in particular with
respect to the  carrying  value and  realizability  of the assets held for sale.
Actual results could differ from estimates making it reasonably  possible that a
change in the estimates could occur in the near term.

     Cash and cash equivalents and short-term investments:

     The Company  considers  all highly  liquid  investments  with a maturity of
three  months  or  less  when  purchased  to  be  cash  equivalents.  Short-term
investments are carried at cost plus accrued  interest and consist of commercial
paper and  government  obligations,  having  original  maturities of longer than
three  months  but less  than one  year,  held at  financial  institutions.  The
carrying  values of the Company's cash  equivalents  and short-term  investments
approximate  their  market  values  based  on  quoted  market  prices.  All cash
equivalents and short-term investments are expected to be held to maturity.



<PAGE> 52



                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


     Property and equipment:

     The  components  of property  and  equipment,  exclusive of assets held for
sale, are as follows (in thousands):

<TABLE>
<CAPTION>
                                                                     June 30,                    Estimated
                                                                1997           1996                Lives
                                                                ----           ----                -----
      <S>                                                   <C>            <C>                 <C>


      Laboratory and pilot production equipment             $   10,558     $  10,127           3 - 10 years
      Office furniture and equipment                             3,326         3,075           3 - 10 years
      Leasehold improvements                                     3,858         3,718           2 -  4 years
                                                            ----------     ---------
                                                                17,742        16,920
      Less accumulated depreciation
        and amortization                                       (13,900)      (12,878)
                                                            ----------     ---------
                                                            $    3,842     $   4,042
                                                            ==========     =========
</TABLE>

     Property and equipment  purchased are depreciated  using the  straight-line
method over their estimated useful lives.  Leasehold  improvements are amortized
over the shorter of the life of the related asset or the life of the lease.

     Assets held for sale:

     Land and  building  related to  manufacturing  facilities  and the  related
manufacturing equipment,  aggregating $5,942,000 and $6,446,000 at June 30, 1997
and 1996, respectively, are classified as assets held for sale. These assets are
carried at their estimated net realizable value (See Note 3).

<PAGE> 53
                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)

     Other assets:

     Other assets at June 30, 1997 and 1996 include approximately $1,290,000 and
$1,010,000,  respectively,  of patent costs, net of accumulated  amortization of
$276,000  and  $161,000,  respectively,  which are  capitalized  as incurred and
amortized over a twelve-year period.

     Revenue recognition:

     Technology disclosure fees, licensing fees and option payments,  related to
future performance, are deferred and recorded as revenue as they are earned over
specified future performance periods. In return for contract payments,  contract
partners have received or will receive certain  marketing  and/or  manufacturing
rights and  material for clinical  use and  testing.  Revenue  recognized  under
arrangements with Pharmacia & Upjohn Inc., aggregated  approximately  $4,500,000
for the period  from July 10, 1985  (inception)  to June 30,  1997.  Pharmacia &
Upjohn Inc.  has the  marketing  rights to Optro in  Scandinavia  under its 1991
agreement  with the Company.  Research and  development  fees and grant  revenue
irrevocably received are recognized as revenue when received.

<PAGE> 54
                                SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


     Research and development costs:

     Research  and  development  costs are  expensed  as  incurred.  These costs
consist of direct and indirect costs  associated with specific  projects as well
as fees paid to various  laboratories that conduct certain  activities on behalf
of the Company.

     Pursuant  to an  alliance  between  Somatogen  and Eli  Lilly  and  Company
("Lilly")  effective  June  24,  1994,  and  through  May 20,  1997,  Lilly  was
co-developing Somatogen's lead recombinant hemoglobin product, Optro, sharing in
certain  clinical  development  costs  and  contributing  advisory  and  support
services.  Expense reimbursements receivable from Lilly and payable to Lilly are
disclosed as separate components of research and development in the Consolidated
Statement of Operations.

     Stock-Based Compensation Plans:

     Stock-based  compensation plans are accounted for using the intrinsic value
method  prescribed  in  Accounting  Principles  Board  Opinion  ("APB")  No. 25,
"Accounting for Stock Issued to Employees,"  rather than applying the fair value
method prescribed in Statement of Financial Accounting Standards ("SFAS") No.
123, "Accounting for Stock-Based Compensation."

<PAGE> 55

                                SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


     Net loss per share:

     Net loss per share is computed  based upon the weighted  average  number of
common shares and common equivalent shares outstanding. Common equivalent shares
from stock options and warrants are included in the per share calculations where
the effect of their inclusion would be dilutive.

     In February 1997, the Financial  Accounting Standards Board issued SFAS No.
128,  "Earnings per Share." SFAS No. 128,  which is effective for periods ending
after December 15, 1997, requires changes in the computation,  presentation, and
disclosure of earnings per share.  All prior period earnings per share data must
be restated to conform  with the  provisions  of SFAS No. 128.  The Company will
adopt SFAS No. 128 for the year ended June 30, 1998, but does not expect the new
accounting  standard  to  have  a  material  impact  on the  Company's  reported
financial results.

     Reclassifications:

     Certain prior year amounts in the  consolidated  financial  statements  and
footnotes have been reclassified to conform to the current year presentation.

Note 3.   Lilly Alliance

     In June 1994,  the Company  entered into a global  strategic  alliance (the
"Alliance") with Lilly to co-develop  Somatogen's  lead  recombinant  hemoglobin
product,  Optro. In March 1997, the Company  received notice of Lilly's decision
to discontinue their  co-development of Optro. The termination was effective 
May 20, 1997.


<PAGE> 56


                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


     Under the terms of the Alliance, Lilly invested $30,000,000 in exchange for
Somatogen common stock,  including milestone equity investments of $1,000,000 in
September 1994 and $2,000,000 in October 1995 and a $7,000,000 equity investment
made on October 27, 1995 in conjunction with Somatogen's October 18, 1995 public
common  stock  offering.   Additionally,  in  accordance  with  the  termination
provisions  of the  Alliance,  in May  1997  the  Company  received  a  one-time
termination  payment of  $6,000,000,  which is  reflected  in interest and other
income, net in the Consolidated Statement of Operations.  Additionally,  in July
1997 the Company and Lilly executed a revolving  credit agreement which provides
that the  Company  may  borrow up to  $8,000,000  from  Lilly.  Borrowings  bear
interest  at Lilly's  weighted  average  cost of capital.  The credit  agreement
expires in May 2002, or earlier under certain circumstances as identified in the
agreement,  and it contains certain  conditions  including,  but not limited to,
restrictions related to consolidation,  mergers, sales of assets,  indebtedness,
dividends, stock repurchases and loans.

Upon entering the Alliance,  the Company  discontinued all activity  surrounding
its clinical and  commercial  manufacturing  facilities and reduced the carrying
value of these manufacturing facilities to their estimated net realizable values
during the year ended June 30,  1994.  The fiscal 1994 charge to  operations  of
$29,200,000 included  approximately  $21,000,000 for the clinical  manufacturing
facility under construction,  $6,000,000 for the related clinical  manufacturing
equipment and  $2,200,000  for the  engineering  design costs of the  commercial
manufacturing  facility.  Approximately  $1,700,000 of the charge was related to
liabilities accrued at June 30, 1994 to terminate certain construction contracts
and provide for costs to ready certain assets for sale.  Approximately  $433,000
of this balance is remaining at June 30, 1997.

Note 4.    Income taxes

     At June 30, 1997,  the Company had net  operating  loss  carryforwards  for
federal income tax reporting purposes of approximately  $122,000,000.  Under the
federal income tax laws,  approximately $3,000,000 of these carryforwards cannot
be utilized due to prior changes in stock  ownership.  The remainder of the loss
carryforwards  will expire in the years 2003  through  2012.  Future  changes in
stock  ownership  could result in a further  limitation  on the  utilization  of
present  and future  loss  carryforwards.  The  Company  also has  research  and
development tax credit  carryforwards  of  approximately  $4,300,000  which will
expire in the years 2001 through 2012.


<PAGE> 57

                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)

     The tax effects of  significant  items  comprising  the Company's  deferred
taxes are as follows (in thousands):

<TABLE>
<CAPTION>
                                                                                         June 30,
                                                                            -----------------------------
     Deferred tax assets:                                                         1997            1996
                                                                                  ----            ----
<S>                                                                        <C>               <C>

     Net operating loss carryforwards                                       $    45,800       $    40,600
     Research and development carryforwards                                       4,300             3,700
     Temporary differences, net                                                   9,000            10,100
                                                                            -----------       -----------
                                                                                 59,100            54,400
     Valuation allowance                                                        (59,100)          (54,400)
                                                                            ------------      -----------
     Net deferred tax asset                                                 $        --       $        --
                                                                            ===========       ===========
</TABLE>

     There were no material deferred tax liabilities as of June 30, 1997 or 
June 30, 1996.

     At June 30, 1997 and 1996, a valuation allowance for deferred tax assets of
$59,100,000 and  $54,400,000,  respectively,  is required to reduce the deferred
tax assets to the amount  realizable,  zero,  based on the Company's  history of
losses.  The valuation  allowance  increased by $4,700,000 during the year ended
June 30, 1997,  primarily due to additional  losses incurred during the year for
which no tax benefit was recorded.

<PAGE> 58

SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


Note 5.    Leases

     The  Company  leases  office,   production  and  research  and  development
facilities as well as certain  equipment under agreements that expire at various
dates through  October 2001.  Total rent expense  charged to operations  for the
years  ended  June  30,  1997,  1996 and 1995  was  $1,331,000,  $1,225,000  and
$1,387,000, respectively.

     The aggregate  future  minimum  rental  commitments as of June 30, 1997 for
non-cancelable operating leases with initial or remaining terms in excess of one
year is as follows (in thousands):

<TABLE>
<CAPTION>

           Fiscal
        Year Ending                                                  Operating
          June 30,                                                     Leases
          --------                                                     ------
         <S>                                                          <C>

           1998                                                        $1,130
           1999                                                           671
           2000                                                           575
           2001                                                           252
           2002                                                            85
                                                                      -------
           Total lease obligations                                     $2,713
                                                                       ======
</TABLE>



<PAGE> 59



                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


Note 6.    Employee benefit plans

     Savings plan:

     The  Company  maintains  a  Retirement  Plan  covering   substantially  all
employees under Section 401(k) of the Internal Revenue Code. The Retirement Plan
provides for matching Company  contributions  of common stock.  Twice each year,
the Company  contributes  common  stock  equal in value to 50% of  participant's
voluntary  contributions for the preceding  six-month period, up to a maximum of
5% of the participant's compensation for the period. The contributed shares vest
over a four-year  period.  For the years ended June 30, 1997, 1996 and 1995, the
Company made stock match contributions of 39,508, 23,150 and 22,054 shares at an
aggregate value of $265,070, $339,135 and $191,855, respectively.

     Employee stock purchase plan:

     The Company maintains an Employee Stock Purchase Plan (the "Purchase Plan")
under which 300,000 shares of common stock are  authorized  for issuance.  Under
the Purchase Plan, the Board may authorize  participation by eligible employees,
including officers,  in periodic,  biannual offerings following the commencement
of the Purchase Plan. For the years ended June 30, 1997, 1996 and 1995,  34,655,
25,363  and  30,759  common   shares  were  issued  under  the  Purchase   Plan,
respectively.

Note 7.    Stock Option Plans and Warrants

     The Company's  Stock Option Plan (the "Stock Option Plan") provides for the
granting of stock options and supplemental stock bonuses to officers,  employees
and directors.

     The Company  currently has 4,525,960  shares  authorized for issuance under
its Stock  Option  Plan.  The Stock Option Plan was amended on October 31, 1996,
increasing  the number of shares of common stock  authorized  for issuance under
such plan by 1,000,000 shares.

     Options  granted  under the Stock Option Plan may be exercised for a period
of not more  than ten  years  from the date of grant or any  shorter  period  as
determined by the Board of Directors. Options vest as determined by the Board of
Directors,  subject to acceleration at the discretion of the Board of Directors.
The options are priced at the fair market value of the Company's common stock on
the date of grant.

     In fiscal 1995, the Company adopted the Consultants  Stock Option Plan (the
"Consultants'  Plan") and currently has 80,000 shares of common stock authorized
for issuance  thereunder.  Options  granted may be exercised for a period of not
more than ten years from the date of grant.  Options vest as  determined  by the
Board of  Directors.  The  options  are priced at the fair  market  value of the
Company's common stock on the date of grant.



<PAGE> 60


                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


     The Company also maintains a Non-Employee Directors' Stock Option Plan (the
"Directors' Plan") under which 270,000 shares of common stock are authorized for
issuance.  The  Directors'  Plan provides for  automatic  and  non-discretionary
grants.  On the date of each annual meeting of stockholders,  each  non-employee
director who is then a member of the Company's  Board of Directors  will receive
an option to purchase a number of shares determined by a specified formula.  The
minimum  annual  option  grant is 5,000  shares and the maximum  annual grant is
10,000 shares.  The options  expire six years after grant,  vest in twelve equal
quarterly installments (so long as the optionee continues to serve as a director
of the Company) and are priced at the fair market value of the Company's  common
stock on the date of grant.

     The following table summarizes  information about stock options outstanding
at June 30, 1997:

<TABLE>
<CAPTION>

                                              Outstanding Options            Outstanding Vested Options
                                   ----------------------------------------  --------------------------
                                    Average         Weighted                    Weighted
                                   Remaining         Average                     Average
         Range of                 Contractual       Exercise        Number      Exercise          Number
      Exercise Price                  Life           Price       Outstanding      Price        Outstanding
      --------------              -----------       --------     -----------    --------       -----------
<S>                                <C>              <C>              <C>          <C>             <C>

     $ 0.40 -- $1.80               0.6 years         $1.35            7,759        $1.35             7,759
       5.13 --  7.50               4.1 years          6.37        1,017,096         6.68           321,036
       7.75 -- 10.63               3.8 years          9.01          972,865         8.60           537,227
      11.00 -- 16.50               4.3 years         13.87          625,282        13.65           333,738
      16.75 -- 21.38               4.3 years         18.40          150,265        18.43            70,659
      25.75 -- 32.50               1.1 years         30.25              300        30.25               300
                                                                -----------                    -----------
                                                                  2,773,567                      1,270,719
                                                                ===========                    ===========
</TABLE>

     In  July  1997,  the  Board  of  Directors  ratified  an  amendment  to the
Directors'  Plan.  The amendment  provides for a 200,000  share  increase in the
Directors' Plan option pool, a  non-discretionary  option grant of 15,000 shares
upon initial  appointment to the Board of Directors,  an increase in the minimum
and maximum annual grant to 7,500 and 15,000 shares,  respectively,  accelerates
option vesting upon a change in control and gives non-employee board members the
alternative of deferring fees in exchange for discounted  option grants with the
discount  equal to the amount of the deferred  fee. The  amendment is subject to
stockholder approval.

     During fiscal 1997 certain  employees and  consultants,  holding options to
purchase shares of the Company's  common stock with a weighted  average exercise
price per share of $24.68  exchanged their existing vested and unvested  options
for replacement options to purchase the same number of shares of common stock at
a weighted average exercise price per share of $9.44, which was the market value
at the date of exchange. The vesting period on all the replacement options began
on the date of grant and  continues  quarterly  over two and one-half  years for
options  granted to consultants and five years for options granted to employees.
Options for 131,000  shares were  exchanged in fiscal 1997 and are  reflected in
both the  cancelation  and grant activity in the following  options  outstanding
table.


<PAGE> 61


                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


     Stock option  transactions for the years ended June 30, 1997, 1996 and 1995
were as follows:

<TABLE>
<CAPTION>
                                                                             Options Outstanding
                                                                       -----------------------------------
                                                                                           Weighted Average
                                                                        Number of           Exercise Price
                                                                          Shares               Per Share
                                                                        ---------          ---------------
<S>                                                                    <C>                    <C>

           Balance at June 30, 1994                                      1,840,880             $   7.89
           Granted                                                       1,057,559                 9.25
           Exercised                                                      (381,463)                 .79
           Canceled                                                       (204,605)               15.80
                                                                       -----------
           Balance at June 30, 1995                                      2,312,371                 8.93
           Granted                                                         577,141                16.88
           Exercised                                                      (258,751)                2.84
           Canceled                                                        (96,550)               12.14
                                                                       -----------
           Balance at June 30, 1996                                      2,534,211                11.26
           Granted                                                         923,690                 8.79
           Exercised                                                      (106,229)                5.93
           Canceled                                                       (578,105)               16.13
                                                                       -----------
           Balance at June 30, 1997                                      2,773,567                 9.63
                                                                       ===========
           Exercisable at June 30, 1997                                  1,270,719                 9.95
                                                                       ===========

</TABLE>

     At June 30, 1997,  total shares  available for grant under the Stock Option
Plan,  the  Consultants'  Plan and the Directors'  Plan are 955,937,  19,000 and
90,456, respectively,

<PAGE> 62
 
                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


     The Company  applies APB No. 25 in  accounting  for its Stock  Option Plan,
Directors'  Plan  and  Purchase  Plan  (collectively,   the  "Plans"),   and  no
compensation  expense  has been  recognized  in the  financial  statements.  Had
compensation  expense for the Company's Plans been determined  based on the fair
value at the grant dates for awards under the Plans  consistent  with the method
of  accounting  prescribed  by SFAS No. 123, the Company's net loss and loss per
share would have been  increased to the pro forma  amounts  indicated  below (in
thousands, except per share amounts):

<TABLE>
<CAPTION>
                                                                                    June 30,
                                                                             1997              1996
                                                                             ----              ----
<S>                                                                       <C>                <C>

         Net loss                                    As reported           $10,940            $18,023
                                                     Pro forma              12,339             18,753

         Net loss per common share                   As reported           $(0.53)            $(0.90)
                                                     Pro forma              (0.59)             (0.93)
</TABLE>


<PAGE> 63



                                 SOMATOGEN, INC.
                    (A Corporation in the Development Stage)

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)


     In accordance  with the guidance  provided  under SFAS No. 123, fair values
are based on  minimum  values.  The  weighted  average  fair value of options is
estimated as $4.82 and $8.09 for options  granted  during  fiscal years 1997 and
1996,  respectively,  using  the  Black-Scholes  option-pricing  model  with the
following  weighted-average  assumptions  used for grants during the years ended
June 30, 1997 and 1996:  dividend yield of zero;  expected volatility of 58% and
49%, respectively; risk-free interest rates of 6.4% and 6.1%, respectively; and,
an  expected  term of 4.4 years.  The  risk-free  rates used in the  calculation
represent  the average  U.S.  Government  Security  interest  rates on the stock
option grant date with maturities equal to the expected term of the option.  The
effect of actual forfeitures is included in the computation of compensation cost
for options granted during each of the respective years.

     Warrants:

     As of June 30,  1997,  the Company  had  warrants  outstanding  to purchase
85,000  shares of common  stock at an  exercise  price of $9.75 per  share.  The
warrants expire November 9, 1997.

Note 8.  Stockholder Rights Plan

     In June 1997,  the Board of  Directors  adopted a  stockholder  rights plan
("Rights  Plan").  The  Rights  Plan is  designed  to deter  coercive  or unfair
takeover  tactics and to prevent an acquiring entity from gaining control of the
Company without offering a fair price to all of the Company's stockholders.

Each right would  entitle the holder of the  Company's  common stock to purchase
one one-hundredth of a share of Series A Junior Participating Preferred Stock at
an exercise  price of $44.00,  subject to  adjustment to prevent  dilution.  The
rights are evidenced by the common stock certificates and will not separate from
the common stock until the earlier of (i) the date of a public announcement that
a person,  entity or group of affiliated or  associated  persons (an  "Acquiring
Person") have acquired  beneficial  ownership of 15% or more of the  outstanding
shares of common stock; or (ii) 10 days after a public  announcement of a tender
or exchange offer by any person or entity if upon consummation such person would
be an Acquiring Person. Further, upon the occurrence of certain events described
below,  the rights  generally  entitle each right holder  (except the  Acquiring
Person) to purchase  that number of shares of the  Company's  common stock which
equals the $44.00 exercise price of the right divided by one-half of the current
market price of the common stock.  Those events  generally  include (i) upon any
person or entity becoming an Acquiring Person;  and (ii) if any person or entity
becomes an Acquiring  Person and  thereafter,  (a) the Company is merged with or
into an Acquiring Person and the Company's common stock is changed, converted or
exchanged;  or (b) 50% or more of the Company's assets or earning power is sold;
or (c) an Acquiring Person engages in one or more "self-dealing" transactions as
described in the Rights Agreement.

     The Company is  generally  entitled to redeem the rights for $.01 per right
at any time  prior to the  earlier  of the date on which  any  person  or entity
becomes an Acquiring  Person or June 5, 2007.  The rights will expire on June 5,
2007, unless redeemed or exchanged earlier by the Company pursuant to the Rights
Plan.



               CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the incorporation by reference in the Registration
Statements on Form S-8 (Nos. 33-42012, 33-43332, 33-79466, 33-89426, 333-00896,
333-00894, 333-00892 and 333-15757) and in the Prospectus constituting part of
the Registration Statement on Form S-3 (No. 33-73224) of Somatogen, Inc. of
our report dated July 25, 1997 appearing on page 43 of this Form 10-K.

PRICE WATERHOUSE LLP
Boulder, Colorado

September 5, 1997


<TABLE> <S> <C>

<ARTICLE>     5
<LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
 CONSOLIDATED  BALANCE SHEET AS OF JUNE 30, 1997 AND THE CONSOLIDATED  STATEMENT
 OF OPERATIONS FOR THE TWELVE MONTHS ENDED JUNE 30, 1997 AND IS QUALIFIED IN ITS
 ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>  1,000
       
<S>                                  <C>
<PERIOD-TYPE>                        12-MOS
<FISCAL-YEAR-END>                    JUN-30-1997
<PERIOD-END>                         JUN-30-1997
<CASH>                                    24,868
<SECURITIES>                              19,158
<RECEIVABLES>                                483
<ALLOWANCES>                                   0
<INVENTORY>                                    0
<CURRENT-ASSETS>                          44,891
<PP&E>                                    17,742
<DEPRECIATION>                            13,900
<TOTAL-ASSETS>                            56,031
<CURRENT-LIABILITIES>                      2,433
<BONDS>                                        0
<COMMON>                                      21
                          0
                                    0
<OTHER-SE>                                53,598
<TOTAL-LIABILITY-AND-EQUITY>              56,031
<SALES>                                        0
<TOTAL-REVENUES>                               0
<CGS>                                          0
<TOTAL-COSTS>                                  0
<OTHER-EXPENSES>                          15,807
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                            19
<INCOME-PRETAX>                          (10,940)
<INCOME-TAX>                                   0
<INCOME-CONTINUING>                      (10,940)
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                             (10,940)
<EPS-PRIMARY>                              (0.53)
<EPS-DILUTED>                                  0
        

</TABLE>




                                           *CONFIDENTIAL TREATMENT FOR MARKED
                                           PORTIONS REQUESTED UNDER 17 C.F.R.
                                           SECTION 200.80(b)(4) and 240.24(b).*


- -------------------------------------------------------------------------------





                                   $8,000,000


                       REVOLVING CREDIT FACILITY AGREEMENT



                            Dated as of July 28, 1997


                                     Between


                                SOMATOGEN, INC.,


                                       and

                              ELI LILLY AND COMPANY





<PAGE> 2




                                TABLE OF CONTENTS

ARTICLE I.          DEFINITIONS                                             Page
         1.01.      Defined Terms---------------------------------------------4
         1.02.      Terms Generally-------------------------------------------8

ARTICLE II.         THE CREDITS

         2.01.      Commitments-----------------------------------------------8
         2.02.      Borrowing Procedure---------------------------------------9
         2.03.      Repayment of Term Loans; Evidence of Debt-----------------9
         2.04.      Interest on Loans-----------------------------------------9
         2.05.      Default Interest------------------------------------------10
         2.06.      Prepayment------------------------------------------------10
         2.07.      Payments--------------------------------------------------10
         2.08.      Mandatory Repayment---------------------------------------11

ARTICLE III.        REPRESENTATIONS AND WARRANTIES
         3.01.      Organization; Powers--------------------------------------11
         3.02.      Authorization---------------------------------------------11
         3.03.      Enforceability--------------------------------------------12
         3.04.      Governmental Approvals------------------------------------12
         3.05.      Financial Statements--------------------------------------12
         3.06.      Litigation; Compliance with Laws--------------------------12
         3.07.      Use of Proceeds-------------------------------------------13
         3.08.      Taxes-----------------------------------------------------13
         3.09.      Solvency--------------------------------------------------13

ARTICLE IV          CONDITIONS OF LENDING
         4.01.      All Borrowings--------------------------------------------13
         4.02.      Closing Date----------------------------------------------14

ARTICLE V.          COVENANTS
         5.01.      Existence-------------------------------------------------15
         5.02.      Business and Properties-----------------------------------15
         5.03.      Financial Statements, Reports, Etc.-----------------------15
         5.04.      Insurance-------------------------------------------------16
         5.05.      Obligations and Taxes-------------------------------------16
         5.06.      Litigation and Other Notices------------------------------16
         5.07.      Right to Inspect------------------------------------------17
         5.08.      Consolidations, Mergers, and Sales of Assets--------------17
         5.09.      Indebtedness----------------------------------------------18
         5.10.      Dividends; Repurchases of Stock---------------------------18
         5.11.      Liens-----------------------------------------------------18
         5.12.      Limitations on Sale and Leaseback Transactions------------19
         5.13.      Loans-----------------------------------------------------19
         5.14.      Transactions with Affiliates------------------------------19



<PAGE> 3


ARTICLE VI.         EVENTS OF DEFAULT

ARTICLE VII.        MISCELLANEOUS
         7.01.      Notices---------------------------------------------------21
         7.02.      Survival of Agreement-------------------------------------22
         7.03.      Binding Effect--------------------------------------------22
         7.04.      Successors and Assigns------------------------------------22
         7.05.      Expenses; Indemnity---------------------------------------22
         7.06.      Applicable Law--------------------------------------------23
         7.07.      Waivers; Amendment----------------------------------------23
         7.08.      Entire Agreement------------------------------------------23
         7.09.      Severability----------------------------------------------23
         7.10.      Counterparts----------------------------------------------24
         7.11.      Headings--------------------------------------------------24
         7.12.      Right of Setoff-------------------------------------------24
         7.13.      Jurisdiction and Venue------------------------------------24
         7.14.      Confidentiality-------------------------------------------25


EXHIBITS AND SCHEDULES

Exhibit A Form of Opinion of counsel to Somatogen-----------------------------26



<PAGE> 4



                       REVOLVING CREDIT FACILITY  AGREEMENT dated as of July 28,
                         1997 among:
                                SOMATOGEN, INC.,
                      a Delaware corporation ("Somatogen");
                                       and
                             ELI LILLY AND COMPANY,
                        an Indiana corporation ("Lilly").




         The parties hereto agree as follows:

                             ARTICLE I. DEFINITIONS

         Section 1.01.  Defined Terms.  As used in this Agreement, the following
terms shall have the meanings specified below:

                  "Affiliate"  means,  when used  with  respect  to a  specified
         person,  another  person  that  directly or  indirectly  controls or is
         controlled by or is under common control with the person specified.

                  "Board of Directors" means the Board of Directors of Somatogen
         or any duly authorized committee thereof.

                  "Borrowing" means a Loan from Lilly to Somatogen under this
         Agreement.

                  "Business Day" means any day (other than a Saturday, Sunday or
         legal  holiday  in the State of New  York) on which  banks are open for
         business in New York City.

                  "Capital   Lease   Obligations"   of  any  person   means  the
         obligations of such person to pay rent or other amounts under any lease
         of (or other  arrangement  conveying the right to use) real or personal
         property,  or a combination thereof,  which obligations are required to
         be classified and accounted for as capital leases on a balance sheet of
         such person  under GAAP (as defined  herein)  and,  for the purposes of
         this Agreement, the amount of such obligations at any time shall be the
         capitalized  amount thereof at such time  determined in accordance with
         GAAP.


<PAGE> 5

                  A "Change in Control"  shall be deemed to have occurred if any
         person or group of persons  (other  than  Lilly)  shall  have  acquired
         beneficial  ownership  of  shares  representing  more  than  50% of the
         combined voting power  represented by the outstanding  Voting Shares of
         Somatogen (within the meaning of Section 13(d) or 14(d) of the Exchange
         Act, and the applicable rules and regulations thereunder).

                  "Closing  Date" means July 28, 1997, or such other date as may
         be mutually agreed by the parties.

                  "Code"  means the Internal  Revenue Code of 1986,  as the same
         may be amended from time to time.

                  "Commitment"  means the  obligation of Lilly to make a loan in
         the amount set forth in Section 2.01.

                  "Control" means the possession, directly or indirectly, of the
         power to direct or cause the direction of the management or policies of
         a person,  whether  through  the  ownership  of voting  securities,  by
         contract or otherwise,  and the terms  "controlling"  and  "controlled"
         shall have meanings correlative thereto.

                  "Default" means any Event of Default or any event or condition
         which upon notice,  lapse of time or both would  constitute an Event of
         Default.

                  "Dollars" or "$" means lawful money of the United States of
         America.

                  "Event of Default" has the meaning assigned to such term in
         Article VI.

                  "Exchange Act" means the Securities Exchange Act of 1934, as
         amended.

                  "Financial  Officer" of any  corporation  means the  chairman,
         president,  chief financial officer,  principal  accounting officer, or
         treasurer of such corporation.

                  "GAAP" means generally accepted accounting principles, applied
         on a consistent basis.

                  "Governmental  Authority" means any Federal,  state,  local or
         foreign court or governmental  agency,  authority,  instrumentality  or
         regulatory body.


<PAGE> 6

                  "Guarantee   Obligations"  of  or  by  any  person  means  any
         obligation,  contingent or otherwise,  of such person  guaranteeing  or
         having the economic effect of guaranteeing any indebtedness  (including
         any  interest  and fees owing in respect of such  indebtedness)  of any
         other person (the "primary obligor") in any manner, whether directly or
         indirectly,  and  including any  obligation  of such person,  direct or
         indirect,  (a) to purchase  or pay (or advance or supply  funds for the
         purchase or payment of) such indebtedness or to purchase (or to advance
         or supply  funds for the  purchase  of) any security for the payment of
         such indebtedness, (b) to purchase property, securities or services for
         the purpose of assuring the owner of such  indebtedness  of the payment
         of such indebtedness or (c) to maintain working capital, equity capital
         or other  financial  statement  condition  or  liquidity of the primary
         obligor so as to enable the primary  obligor to pay such  indebtedness;
         provided  that  the  term  Guarantee   Obligations  shall  not  include
         endorsements for collection or deposit,  in either case in the ordinary
         course of business.

                  "Indebtedness" of any person means, without  duplication,  (a)
         all obligations of such person for borrowed money,  (b) all obligations
         of such  person  evidenced  by  bonds,  debentures,  notes  or  similar
         instruments,  (c) all obligations of such person under conditional sale
         or other  title  retention  agreements  relating  to property or assets
         purchased by such person,  (d) all obligations of such person issued or
         assumed as the deferred  purchase price of property or services,  other
         than trade accounts  payable (other than for borrowed  money)  arising,
         and accrued  expenses  incurred,  in the ordinary course of business so
         long as such trade  accounts  payable are payable within 30 days of the
         date the  respective  goods or services are delivered or rendered,  (e)
         all  indebtedness of others secured by (or for which the holder of such
         indebtedness  has an existing  right,  contingent or  otherwise,  to be
         secured  by),  any Lien on property  owned or acquired by such  person,
         whether or not the obligations  secured thereby have been assumed,  (f)
         all  Guarantee  Obligations  of such person and (g) all  Capital  Lease
         Obligations  of such  person.  The  Indebtedness  of any  person  shall
         include the  Indebtedness  of any partnership in which such person is a
         general partner.

                  "Lien" means any mortgage, lien, pledge, encumbrance, charge
         or security interest.
<PAGE> 7

                  "Loan" means a loan from Lilly to Somatogen pursuant to this
         Agreement.

                  "Loan  Documents"  means  this  Agreement  and  any  agreement
         required to be executed and  delivered  by  Somatogen  pursuant to this
         Agreement.

                  "Material Adverse Effect" means a materially adverse effect on
         the business, results of operations, properties, or financial condition
         of Somatogen.

                  "Maturity Date" means the earlier of (1) the date specified in
         Section 2.08 and (2) May 18, 2002.

                  "Person"  means  any  natural  person,  corporation,  business
         trust, joint venture, association,  company, limited liability company,
         partnership  or  government,  or any  agency or  political  subdivision
         thereof.

                  "Sale and Leaseback  Transaction"  means any arrangement  with
         any person  pursuant to which  Somatogen  leases any property  that has
         been or is to be sold or transferred by Somatogen to such person, other
         than (1) temporary leases for a term,  including renewals at the option
         of the  lessee,  of not more than three  years,  (2) leases of property
         executed by the time of, or within 12 months after the  acquisition  of
         the  property,  and (3)  arrangements  pursuant to any provision of law
         with an effect similar to the former Section  168(f)(8) of the Internal
         Revenue Code of 1954, as amended.

                  "SEC" means the Securities and Exchange Commission.

                  "Subsidiary" means, with respect to any person (the "parent"),
         any other person (other than a natural  person) of which  securities or
         other ownership  interests  representing  more than 50% of the ordinary
         voting power,  or more than 50% of the general  partnership  interests,
         are, at the time as of which any  determination is being made, owned or
         controlled by the parent or one or more  subsidiaries  of the parent or
         by the parent and one or more subsidiaries of the parent.

                  "Subsidiary" means a subsidiary of Somatogen.

                  "Transactions" has the meaning assigned to such term in
         Section 3.02.
<PAGE> 8

                  "Value"   means,   with  respect  to  a  Sale  and   Leaseback
         Transaction,  an  amount  equal to the net  present  value of the lease
         payments with respect to the term of the lease remaining on the date as
         of which the amount is being determined,  without regard to any renewal
         or extension options contained in the lease, discounted at the interest
         rate on the Loans which are  outstanding  on the effective date of such
         Sale and Leaseback Transaction.

                  "Voting   Shares"   means,   as  to  shares  of  a  particular
         corporation,   outstanding  shares  of  stock  of  any  class  of  such
         corporation  entitled to vote in the election of  directors,  excluding
         shares entitled so to vote only upon the happening of some contingency,
         and  including  shares  that  would  be  entitled  to vote  but for the
         application of a control share statute.

                  "Weighted  Average  Cost of Capital"  means,  for any calendar
         year,  the "Cost of Capital" for that year  determined  by Lilly in its
         discretion  pursuant  to Section  3.5 of the Eli Lilly and  Company EVA
         Bonus Plan.  For  calendar  year 1997,  the  Weighted  Average  Cost of
         Capital is thirteen percent (13%).

         Section 1.02.  Terms  Generally.  The definitions in Section 1.01 shall
apply  equally to both the singular and plural forms of the terms  defined.  The
words  "include",  "includes" and "including"  shall be deemed to be followed by
the phrase "without limitation".  Except as otherwise expressly provided herein,
all terms of an accounting or financial  nature shall be construed in accordance
with GAAP.

                             ARTICLE II. THE CREDITS

         Section 2.01.  Commitments.

         (a)      Subject  to the  terms and  conditions  and  relying  upon the
                  representations  and warranties herein set forth, Lilly agrees
                  to make Loans in Dollars to  Somatogen,  on any  Business  Day
                  during the period from and  including  the Closing Date to the
                  Maturity Date, in a principal amount not to exceed  $8,000,000
                  outstanding at any time.

         (b)      Within the foregoing  limits,  Somatogen  may borrow,  pay or
                  prepay and reborrow  Loans from and including the Closing Date
                  to the Maturity Date,  subject to the terms,  conditions,  and
                  limitations set forth herein.

         (c)      Loans shall be in an  aggregate  principal  amount of at least
                  $1,000,000  and may be in  integral  multiples  of $100,000 in
                  excess of  $1,000,000.  Loans shall be made only in accordance
                  with the borrowing procedure set forth in the next Section.

<PAGE> 9

         Section 2.02.  Borrowing Procedure.

         (a)      In order to effect a Borrowing,  Somatogen  shall hand deliver
                  or  telecopy  to Lilly a notice of  borrowing  not later  than
                  thirty (30) days before the day of such Borrowing. Such notice
                  shall be  irrevocable  and  shall  specify  the  amount of the
                  Borrowing,  the  date of the  Borrowing,  and  funds  transfer
                  instructions.

         (b)       On the effective date of the Borrowing,  Somatogen shall hand
                   deliver or telecopy the  certificate  of a Financial  Officer
                   called for under Section 4.01(d).

         Section 2.03.  Repayment of  Loans: Evidence of Debt.

         (a)      Somatogen hereby promises to pay to Lilly the entire aggregate
                  unpaid principal amount of the Loans on the Maturity Date. The
                  Loans shall bear  interest on the unpaid  principal  amount as
                  set forth in Section 2.04.

         (b)      Lilly shall  maintain an account or  accounts  evidencing  the
                  borrowing,  including  any amounts of  principal  and interest
                  payable and paid Lilly from time to time under this Agreement.

         (c)      The  entries  made in the  accounts  described  above shall be
                  prima  facie  evidence  of the  existence  and  amounts of the
                  obligations  therein  recorded;  provided  that the failure of
                  Lilly to maintain such accounts or any error therein shall not
                  in any manner affect the obligations of Somatogen to repay the
                  Loans in accordance with their terms.

         Section 2.04.  Interest on Loans.

         (a)      Subject to the  provisions  of Section  2.05,  each  Borrowing
                  shall  bear  interest  (computed  on the  basis of the  actual
                  number of days  elapsed over a year of 365 days) at a rate per
                  annum equal to Lilly's  Weighted  Average Cost of Capital,  as
                  adjusted  for each  calendar  year.  Interest  shall  compound
                  annually.

         (b)      Interest  on each Loan  shall be  payable  (i) upon  voluntary
                  prepayment  pursuant to Section  2.06;  and (ii) at  maturity,
                  whether on the Maturity Date, by acceleration, or otherwise.
<PAGE> 10

         Section  2.05.  Default  Interest.  If Somatogen  shall  default in the
payment of the principal of or interest on any Loan or any other amount becoming
due hereunder, whether by scheduled maturity, notice of prepayment, acceleration
or  otherwise,  Somatogen  shall on  demand  from  time to time  from  Lilly pay
interest on such  defaulted  amount up to (but not including) the date of actual
payment  (after as well as before  judgment)  at a rate per annum  (computed  as
provided in Section  2.04(a)) equal to Lilly's  Weighted Average Cost of Capital
plus 1%.

         Section 2.06.  Prepayment.

         (a)      Somatogen shall have the right at any time and time to time to
                  prepay  any  Borrowing,  in  whole  or in  part,  upon  giving
                  telecopy  notice  (or  phone  notice  promptly   confirmed  by
                  telecopy) to Lilly before 10:00 a.m.,  New York City time, one
                  Business Day prior to  prepayment.  Prepayments  shall be in a
                  minimum amount of $100,000 or in integral multiples thereof.

         (b)      Each notice of prepayment  shall specify the  prepayment  date
                  and  the  principal  amount  of  each  Borrowing  (or  portion
                  thereof) to be prepaid,  shall be irrevocable and shall commit
                  Somatogen to prepay such Borrowing (or portion thereof) by the
                  amount  stated  therein  on the date  specified  therein.  All
                  prepayments  under this Section 2.06 shall be  accompanied  by
                  accrued  interest on the principal amount being prepaid to and
                  including the date of payment.

         Section 2.07.  Payments.

         (a)      Somatogen shall make each payment  (including  principal of or
                  interest on any Borrowing and any other amounts) hereunder not
                  later than 12:00  noon,  New York City time,  on the date when
                  due, in Dollars and  immediately  available  funds, to Lilly's
                  designated account.

         (b)      Whenever  any payment  (including  principal of or interest on
                  any Borrowing or any Fees or other  amounts)  hereunder  shall
                  become due, or otherwise  would occur,  on a day that is not a
                  Business Day, such payment may be made on the next  succeeding
                  Business Day, and such extension of time shall in such case be
                  included in the computation of interest, if applicable.
<PAGE> 11

         Section  2.08.  Mandatory  Repayment.  In the event a Change in Control
shall occur and the person or group of persons obtaining control [ * ], the date
of the closing of the  transaction  which causes the Change in Control  shall be
considered the Maturity Date.  Somatogen shall pay to Lilly on the Maturity Date
the entire aggregate  unpaid  principal  amount of the Loans,  together with all
unpaid interest to and including the date of payment.

                   ARTICLE III. REPRESENTATIONS AND WARRANTIES

         Somatogen represents and warrants to Lilly that:

         Section 3.01.  Organization: Powers.  Somatogen

         (a)      is a corporation duly organized, validly existing and in good
                  standing under the laws of the jurisdiction of its organiza-
                  tion,

         (b)      has all  requisite  corporate  power and  authority to own its
                  property  and  assets  and to  carry  on its  business  as now
                  conducted and as proposed to be conducted,

         (c)      is qualified to do business in every  jurisdiction  where such
                  qualification  is  required,  except  where the  failure so to
                  qualify would not result in a Material Adverse Effect, and (d)
                  has the corporate power and authority to execute,  deliver and
                  perform its  obligations  under this  Agreement  and to borrow
                  hereunder.

         Section 3.02. Authorization. The execution, delivery and performance by
Somatogen of this  Agreement and the  Borrowings  hereunder  (collectively,  the
"Transactions")  (a) have been duly authorized by all requisite corporate action
and (b) will not (i)  violate (A) any  provision  of any law,  statute,  rule or
regulation  or  of  the  certificate  of  incorporation  or  other  constitutive
documents  or  bylaws  of  Somatogen  or any  Subsidiary,  (B) any  order of any
Governmental Authority or (C) any provision of any indenture, agreement or other
instrument to which Somatogen or any Subsidiary is a party or by which it or any
of its property is or may be bound, (ii) be in conflict with, result in a breach
of or constitute (alone or with notice or lapse of time or both) a default under
any such  indenture,  agreement  or other  instrument  or  (iii)  result  in the
creation or  imposition  of any lien upon any property or assets of Somatogen or
any Subsidiary.

*CONFIDENTIAL TREATMENT REQUESTED UNDER 17 C.F.R. SECTION 200.80(b)(4) and
240.24(b).*
<PAGE> 12

         Section 3.03. Enforceability. This Agreement constitutes a legal, valid
and binding  obligation of Somatogen,  enforceable in accordance  with its terms
(subject,   as  to  enforceability,   to  applicable   bankruptcy,   insolvency,
reorganization,  moratorium or other similar laws  affecting  creditors'  rights
generally  and to general  principles  of equity  (regardless  of  whether  such
enforceability is considered in a proceeding at law or in equity)).

         Section 3.04. Governmental Approvals. Other than the filing of the Loan
Agreement as an exhibit to the Borrower's  next periodic  report filed under the
Exchange Act, no action,  consent or approval of, registration or filing with or
other action by any  Governmental  Authority is required in connection  with the
Transactions.

         Section 3.05. Financial Statements.  Somatogen has heretofore furnished
to Lilly copies of (i) its audited  consolidated  financial  statements  for the
year ended June 30, 1996,  together with the opinion thereon of Price Waterhouse
LLP, and (ii) its unaudited  consolidated  financial statements for the quarters
ended September 30, 1996,  December 31, 1996, and March 31, 1997. Such financial
statements present fairly, in all material respects, the financial condition and
the results of operations of Somatogen and the  Subsidiaries,  taken as a whole,
as of, and for accounting  periods ending on, such dates in accordance with GAAP
(subject, in the case of said unaudited financial statements, to normal year-end
audit adjustments and the absence of footnotes).

         Section 3.06.  Litigation: Compliance with Laws.

         (a)      There are no actions,  proceedings or investigations  filed or
                  (to the knowledge of Somatogen)  threatened  against Somatogen
                  or any  Subsidiary  in any  court or before  any  Governmental
                  Authority or arbitration  board or tribunal which question the
                  validity or legality of this  Agreement,  the  Transactions or
                  any action taken or to be taken pursuant to this Agreement and
                  no order or judgment has been issued or entered restraining or
                  enjoining   Somatogen   from  the   execution,   delivery   or
                  performance of this Agreement.

         (b)      Neither  Somatogen  nor any  Subsidiary is in violation of any
                  law,  rule or  regulation,  or in default  with respect to any
                  judgment,  writ,  injunction  or  decree  of any  Governmental
                  Authority, where such violation or default would be reasonably
                  likely to result in a Material Adverse Effect.
<PAGE> 13

         Section 3.07.  Use of Proceeds.  All proceeds of the Loans shall be
used for working capital or other general corporate purposes.

         Section  3.08.  Taxes.  Somatogen  and the  Subsidiaries  have filed or
caused to be filed all Federal and material state, local and foreign tax returns
which are  required to be filed by them,  and have paid or caused to be paid all
taxes shown to be due and payable on such returns or on any assessments received
by any of them,  other than any taxes or  assessments  the  validity of which is
being  contested in good faith by appropriate  proceedings,  and with respect to
which appropriate accounting reserves have, to the extent required by GAAP, been
set aside.

         Section 3.09.  Solvency.  To the extent that any proceeds of a Loan are
used by Somatogen,  directly or indirectly,  to fund the repurchase of Somatogen
common stock from Lilly,  Somatogen  represents and warrants that,  after giving
effect to any Borrowing and such use of the proceeds of such Borrowing,  (a) the
aggregate  value of all  properties  of Somatogen at their present fair saleable
value  (i.e.,  the  amount  that  may be  realized  within  a  reasonable  time,
considered to be six months to one year,  either  through  collection or sale at
the  regular  market  value,  conceiving  the latter as the amount that could be
obtained  for the  property  in  question  within  such  period by a capable and
diligent  businessperson  from an  interested  buyer who is willing to  purchase
under  ordinary  selling  conditions),  exceeds  the amount of all the debts and
liabilities  (including  contingent,  subordinated,  unmatured and  unliquidated
liabilities)  of  Somatogen,  (b)  Somatogen  will not have  unreasonably  small
capital with which to conduct its business  operations as  previously  conducted
and (c) Somatogen  projects that it will have  sufficient cash flow to enable it
to pay its debts as they mature.


                        ARTICLE IV. CONDITIONS OF LENDING

         The  obligations  of Lilly to make Loans  hereunder  are subject to the
satisfaction of the following conditions:

         Section 4.01.  All Borrowings.  On the date of each Borrowing:

         (a)      Lilly shall have received a notice of Borrowing as required by
                  Section 2.02.

         (b)      The  representations  and  warranties set forth in Article III
                  shall be true and correct in all  material  respects on and as
                  of the date of such  Borrowing  with the same effect as though
                  made on and as of the Closing Date,  except to the extent such
                  representations and warranties  expressly relate to an earlier
                  date.

         (c)      At the time of and immediately after such Borrowing no Default
                  shall have occurred and be continuing.

         (d)      Lilly shall have received a Financial Officer's Certificate of
                  Somatogen confirming  compliance with the conditions precedent
                  set forth in paragraphs (b) and (c) of this Section.
<PAGE> 14

         Section 4.02.  Closing Date.  On the Closing Date:

         (a)      Lilly shall have received favorable written opinion, dated the
                  Closing  Date,  of counsel to Somatogen in  substantially  the
                  form of Exhibit A hereto.

         (b)      Lilly  shal  have  received (i)  copies  of  the
                  certificate  of incorporation  and by-laws, including  all
                  amendments  thereto,  of Somatogen, certified by the Secretary
                  or an Assistant  Secretary of  Somatogen,  and (ii) a
                  certificate  of the Secretary or an Assistant  Secretary of
                  Somatogen  dated the Closing Date and  certifying  (A) that
                  attached  thereto is a true and complete copy of  resolutions
                  duly  adopted by the Board of  Directors  authorizing  the
                  execution,  delivery  and  performance  of this  Agreement
                  and  the  Borrowings hereunder,  and that  such  resolutions
                  have not been  modified,  rescinded  or amended and are in
                  full force and effect, and (B) as to the incumbency and
                  specimen signature of the officer executing this Agreement on
                  behalf  of Somatogen.

         (c)      Lilly  shall have  received a  certificate,  dated the Closing
                  Date  and  signed  by  a  Financial   Officer  of   Somatogen,
                  confirming  compliance with the conditions precedent set forth
                  in paragraphs (b) and (c) of Section 4.01.

                              ARTICLE V. COVENANTS

A.       Affirmative Covenants.
         Somatogen  covenants  and  agrees  with  Lilly  that  so  long  as this
Agreement  shall remain in effect or the principal of or interest on any Loan or
any other amounts  payable  hereunder  shall be unpaid,  unless Lilly  otherwise
consents in writing, it will, and will cause each of the Subsidiaries to:
<PAGE> 15

         Section 5.01.  Existence.  Do or cause to be done all things necessary,
to preserve and keep in full force and effect its  corporate  existence,  rights
and franchises,  except as expressly permitted under Section 5.07 and except, in
the case of any  Subsidiary,  where the  failure  to do so would not result in a
Material Adverse Effect.

         Section 5.02. Business and Properties.  Comply in all respects with all
applicable laws,  rules,  regulations and orders of any Governmental  Authority,
whether now in effect or hereafter  enacted except  instances that could not, in
the aggregate,  reasonably be expected to result in a Material  Adverse  Effect;
and at all times  maintain and preserve all property  material to the conduct of
its business and keep such property in good repair,  working order and condition
and from time to time make, or cause to be made, all needful and proper repairs,
renewals,  additions,  improvements and replacements  thereto necessary in order
that the business carried on in connection  therewith may be properly  conducted
at all times  except to the  extent  that the  failure to do so would not have a
Material Adverse Effect.

         Section 5.03.  Financial Statements, Reports. Etc.  Furnish to Lilly:

         (a)      within 90 days after the end of each fiscal year, its
                  consolidated balance sheet and the related consolidated
                  earnings statement showing its consolidated financial
                  condition as of the close of such fiscal year and the
                  consolidated results of its operations during such year,
                  all audited by Price Waterhouse LLP or other independent
                  certified public accountants of recognized national standing
                  selected by Somatogen and accompanied by an opinion of such
                  accountants to the effect that such consolidated financial
                  statements fairly present Somatogen' financial condition and
                  results of operations on a consolidated basis in accordance
                  with GAAP;

         (b)      within 60 days after the end of each of the first three fiscal
                  quarters of each fiscal year, its unaudited consolidated
                  balance sheet and related consolidated earnings statement,
                  showing its consolidated financial condition as of the close
                  of such fiscal quarter and the consolidated results of its
                  operations during such fiscal quarter and the then elapsed
                  portion of the fiscal year (and each delivery of such
                  statements shall be deemed a representation that such
                  financial condition and results of operations on a
                  consolidated basis in accordance with GAAP, subject to normal
                  year-end audit adjustments and the absence of footnotes);

         (c)      at any time in which a Default  has  occurred  and is uncured,
                  within 20 days  after the end of each  month  that is not also
                  the  end  of a  fiscal  quarter,  its  unaudited  consolidated
                  balance  sheet and related  consolidated  earnings  statement,
                  showing its consolidated  financial  condition as of the close
                  of such month and the  consolidated  results of its operations
                  during such month and the then  elapsed  portion of the fiscal
                  year;
<PAGE> 16

         (d)      promptly after the same become publicly  available,  copies of
                  all periodic and other  reports or proxy  statements  filed by
                  Somatogen or any Subsidiary  with the SEC or with any national
                  securities exchange; and

         (e)      concurrently with any delivery of financial statements under
                  paragraph (a), (b) or (c) above, a certificate of a Financial
                  Officer of Somatogen (i) certifying as to whether a Default
                  has occurred and is continuing and, if a Default has occurred
                  and is continuing, specifying the details thereof and any
                  action taken or proposed to be taken with respect thereto,
                  and (ii) stating whether any change in GAAP or in the
                  application thereof has occurred since the date of the
                  audited financial statements referred to in Section 3.05(a)
                  and, if any such change has occurred, specifying the effect
                  of such change on the financial statements accompanying such
                  certificate.

         Section  5.04.  Insurance.  Keep its  insurable  properties  adequately
insured at all times by financially sound and reputable  insurers,  and maintain
such other insurance,  to such extent and against such risks, including fire and
other risks insured against by extended coverage, as is customary with companies
similarly situated and in the same or similar businesses.

         Section 5.05.  Obligations and Taxes.  Pay and discharge  promptly when
due all material taxes,  assessments and governmental charges imposed upon it or
upon its income or profits or in respect of its  property,  in each case  before
the same shall  become  delinquent  or in default  and before  penalties  accrue
thereon,  unless and to the  extent  that the same are being  contested  in good
faith by  appropriate  proceedings  and adequate  reserves with respect  thereto
shall, to the extent required by GAAP, have been set aside.

         Section 5.06.  Litigation and Other Notices.  Give Lilly prompt written
 notice of the following:

         (a)      the filing, commencement or written threat of any action,
                  suit or proceeding of the type described in Section 3.06(a);
                  and

         (b)      any Default,  specifying the nature and extent thereof and the
                  action (if any)  which is  proposed  to be taken with  respect
                  thereto.

<PAGE> 17

         Section 5.07.  Right to Inspect.  Upon  reasonable  notice by Lilly and
during normal business hours, allow Lilly and its representatives to inspect and
photocopy the financial records of Somatogen at Somatogen's  principal  offices,
and use best efforts to  facilitate  discussions  with  Somatogen's  independent
auditors  for review of their work  papers,  and to discuss  such  records  with
Somatogen's  independent  auditors. So long as Somatogen is not in Default, this
right of inspection shall be limited to twice per calendar year. After a Default
has  occurred,  this  right  shall not be limited  in  number.  The  information
disclosed in any such inspection is subject to the confidentiality provisions of
Section 7.14 regardless of whether the information is marked as confidential.

B.       Negative Covenants.
         Somatogen  covenants  and  agrees  with  Lilly  that  so  long  as this
Agreement  shall  remain in effect or the  principal  of or interest on any Loan
shall be unpaid,  unless Lilly shall otherwise consent in writing,  it will not,
and will not permit any of the Subsidiaries to:

         Section 5.08.  Consolidations, Mergers, and Sales of Assets.

         (a)      consolidate or merge with or into any other person or
                  liquidate, wind up or dissolve (or suffer any liquidation
                  or dissolution) or

         (b)      sell,  lease or otherwise  transfer (in one  transaction  or a
                  series of  transactions),  or permit any  Subsidiary  to sell,
                  lease or otherwise transfer (in one transaction or a series of
                  transactions),   all  or  substantially   all  of  the  assets
                  (including  capital stock of any  Subsidiary) of Somatogen and
                  the  Subsidiaries,  taken as a  whole,  to any  other  person;
                  provided that Somatogen may merge with another person if

                  (A)      Somatogen is the  corporation  surviving such merger,
                           or if not, the surviving  corporation succeeds to all
                           the rights, duties and obligations of Somatogen under
                           this Agreement, and

                  (B)      immediately  after giving  effect to such merger,  no
                           Default   shall  have   occurred  and  be  continuing
                           (including  no Default  as a result of such  merger's
                           giving rise to an earlier  Maturity  Date pursuant to
                           Section 2.08).

<PAGE> 18

         Section 5.09.  Indebtedness.  Create, incur or suffer to exist any
Indebtedness other than:

         (a)      Indebtedness existing as of the date of this Agreement and
                  any refinancing or extensions thereof,

         (b)      Indebtedness of Somatogen hereunder,

         (c)      unsecured  Indebtedness  the  payment  of  which  (whether  of
                  principal  or  interest,  and whether at stated  maturity,  by
                  acceleration,  by reason of an Event of Default or  otherwise)
                  is expressly  subordinated to the payment of all principal and
                  interest under this Agreement as set forth in a  subordination
                  agreement which has been approved in writing by Lilly prior to
                  the creation of such Indebtedness,  which approval will not be
                  unreasonably withheld.

         (d)      [      *     ]

         (e) other Indebtedness, not to exceed [ * ].

         Section  5.10.  Dividends  and Stock  Repurchases.  Declare  or pay any
dividends or make any other distribution of cash or other property on any of its
shares of capital stock now or hereafter existing; or purchase,  redeem, retire,
or otherwise  acquire any of such capital stock,  except for (i) stock dividends
or stock  splits  payable  in common  stock to  holders  of common  stock,  (ii)
distributions  of  options,  warrants  or rights to  acquire  securities  of the
Company,  (iii)  payment of dividends  on preferred  stock issued after the date
hereof,  and (iv)  repurchases  of  common  stock  from  employees  pursuant  to
employment  agreements  or  similar  arrangements  not  exceeding  [ * ] in  the
aggregate.

         Section 5.11.  Liens.  Create,  assume or suffer to exist any Lien upon
any property to secure any  Indebtedness  of  Somatogen,  any  Subsidiary or any
other person, or permit any Subsidiary to do so, except that the foregoing shall
not prevent Somatogen or any Subsidiary from creating,  assuming or suffering to
exist Liens of the following character:

         (a)      Liens  existing  on the date  hereof  or in  conjunction  with
                  refinancing of any  indebtedness  as to which a Lien exists on
                  the date hereof;

         (b)      any Lien existing on property at the time of the acquisition
                  thereof by Somatogen or any Subsidiary;

         (c)      [     *    ]

         (d)      any  Lien  arising  by  operation  of  law  to  secure  taxes,
                  assessments and other government charges.

*CONFIDENTIAL TREATMENT REQUESTED UNDER 17 C.F.R. SECTION 200.80(b)(4) and
240.24(b).*


<PAGE> 19

         Section 5.12.  Limitations  on Sale and Leaseback  Transactions.  Enter
into any Sale and  Leaseback  Transaction,  or permit any  Subsidiary  to do so,
unless Somatogen or such Subsidiary would be entitled to incur  Indebtedness (in
a  principal  amount  at least  equal to the  Value of such  Sale and  Leaseback
Transaction)  secured  by Liens on the  property  to be leased  without  thereby
violating Section 5.09.

         Section 5.13.  Loans.  Make any loans or advances to any person
including without limitation any Affiliate, officer, director, employee,
consultant, or shareholder of Somatogen except:

         (a)      advance payments to suppliers and consultants in the ordinary
                  course of Somatogen's business and consistent with its past 
                  practices;

         (b)      advances to officers,  directors and employees with respect to
                  reasonable  business  expenses  incurred  by  them  which  are
                  properly   reimbursable   by  Somatogen  as  an  ordinary  and
                  necessary  business  expense  under  the  Code,  and  loans or
                  guarantees  made in connection  with  relocation of employees;
                  and

         (c)      other  loans  to   non-Affiliates   made  in  connection  with
                  Somatogen's business operations and not exceeding an aggregate
                  of [ * ] at any time.

         Section 5.14.  Transactions  with Affiliates.  Except for agreements in
effect  on the date  hereof,  enter  into  any  transaction  with an  Affiliate,
including any purchase,  sale, exchange or lease of property or the rendering of
any service,  unless the transaction is otherwise permitted under this Agreement
and is on fair and reasonable terms no less favorable to Somatogen than it would
obtain in a comparable arm's length transaction with a non-affiliate.

                          ARTICLE VI. EVENTS OF DEFAULT

         In case of the happening of any of the following events (each an "Event
of Default"):

         (a)      any  representation,  warranty or certification made or deemed
                  made  herein  or  in  any  other  Loan  Document  (or  in  any
                  modification or supplement  hereto or thereto) by Somatogen or
                  Somatogen,  or any certificate  furnished to Lilly pursuant to
                  the  provisions  hereof or  thereof,  shall prove to have been
                  false or  misleading  as of the time made or  furnished in any
                  material respect;

*CONFIDENTIAL TREATMENT REQUESTED UNDER 17 C.F.R. SECTION 200.80(b)(4) and
240.24(b).*
<PAGE> 20

         (b)      default  shall  be made in the  payment  of any  principal  or
                  interest of any Loan when and as the same shall become due and
                  payable,  whether  at the due date  thereof or at a date fixed
                  for  prepayment   thereof  or  by   acceleration   thereof  or
                  otherwise;

         (c)      default  shall  be made in the  payment  of any  other  amount
                  (other than an amount  referred to in paragraph (b) above) due
                  hereunder,  when and as the same shall become due and payable,
                  and such default  shall  continue  unremedied  for a period of
                  thirty days;

         (d)      default shall be made in the due  observance or performance of
                  any  covenant,  condition  or  agreement  contained in Section
                  5.08, 5.10, or 5.12;

         (e)      default shall be made in the due  observance or performance of
                  any covenant,  condition or agreement  contained herein (other
                  than  those  specified  in (b),  (c) or (d)  above)  and  such
                  default shall continue  unremedied for a period of thirty days
                  after notice thereof from Lilly to Somatogen;

         (f)      an involuntary proceeding shall be commenced or an involuntary
                  petition shall be filed in a court of competent jurisdiction
                  seeking (i) relief in respect of Somatogen or any Subsidiary,
                  or of a substantial part of the property or assets of
                  Somatogen or any Subsidiary, under Title 11 of the United
                  States Code, as now constituted or hereafter amended, or any
                  other Federal or state bankruptcy, insolvency, receivership
                  or similar law, (ii) the appointment of a receiver, trustee,
                  custodian, sequestrator, conservator or similar official for
                  Somatogen or any Subsidiary or for a substantial part of the
                  property or assets of Somatogen or any Subsidiary or (iii)
                  the winding up or liquidation of Somatogen or any Subsidiary;
                  and such proceeding or petition shall continue undismissed fo
                  60 days or an order or decree approving or ordering any of
                  the foregoing shall be entered; or


         (g)      Somatogen or any Subsidiary shall (i) voluntarily commence an
                  proceeding or file any petition seeking relief under Title 11
                  of the United States Code, as now constituted or hereafter
                  amended, or any other Federal or state bankruptcy, insolvency,
                  receivership or similar law, (ii) consent to the institution
                  of, or fail to contest in a timely and appropriate manner, an
                  proceeding or the filing of any petition described in (f)
                  above, (iii) apply for or consent to the appointment of a
                  trustee, custodian, sequestrator, conservator or similar
                  official for Somatogen or any Subsidiary or for a substantial
                  part of the property or assets of Somatogen or any Subsidiary
                  (iv) file an answer admitting the material allegations of a
                  petition filed against it in any such proceeding, (v) make a
                  general assignment for the benefit of creditors, (vi) become
                  unable, admit in writing its inability or fail generally to
                  pay its debts as they become due or (vii) take any action for
                  the purpose of effecting any of the foregoing;
<PAGE> 21

then, and in every such event (other than an event described in paragraph (f) or
(g) above),  and at any time  thereafter  during the  continuance of such event,
Lilly  shall,  by  notice to  Somatogen,  take  either or both of the  following
actions, at the same or different times: (i) terminate forthwith the Commitments
and (ii) declare the Loans then  outstanding  to be forthwith due and payable in
whole or in part, whereupon the principal of the Loans so declared to be due and
payable,  together with accrued  interest  thereon and all other  liabilities of
Somatogen  accrued  hereunder,  shall become forthwith due and payable,  without
presentment,  demand,  protest or any other notice of any kind, all of which are
hereby   expressly   waived,   anything   contained   herein  to  the   contrary
notwithstanding;  and, in any event described in paragraph (f) or (g) above, the
Commitments  shall  automatically  terminate and the principal of the Loans then
outstanding, together with accrued interest thereon and all other liabilities of
Somatogen accrued hereunder shall automatically become due and payable,  without
presentment,  demand,  protest or any other notice of any kind, all of which are
hereby   expressly   waived,   anything   contained   herein  to  the   contrary
notwithstanding.

                           ARTICLE VII. MISCELLANEOUS

         Section 7.01.  Notices.  Except as otherwise expressly provided herein,
notices and other  communications  provided  for herein  shall be in writing and
shall be delivered by hand or overnight courier service or sent by telecopy,  as
follows:

         (a)      If to Somatogen:

                           Mr. Timothy D. Hoogheem, Senior Vice President of
                           Finance and Administration, CFO and Treasurer
                           Somatogen, Inc.
                           2545 Central Avenue, Suite FD1
                           Boulder, CO  80301
                           (Fax:  303-444-3013)

         (b)      If to Lilly:

                           Mr. Edwin W. Miller
                           Vice President and Treasurer
                           Lilly Corporate Center,
                           Indianapolis, IN 46285
                           D.C. 1878
                           (Fax:  317-277-3275)

         All  notices  and other  communications  given to any  party  hereto in
accordance  with the provisions of this  Agreement  shall be deemed to have been
given on the date of receipt if delivered by hand or overnight  courier  service
or sent by telecopy to such party as provided in this  Section or in  accordance
with the latest  unrevoked  direction  from such party given in accordance  with
this Section.

<PAGE> 22

         Section  7.02.  Survival  of  Agreement.  All  covenants,   agreements,
representations  and warranties made by Somatogen herein and in the certificates
or other  instruments  prepared or delivered in  connection  with or pursuant to
this  Agreement  shall be considered to have been relied upon by Lilly and shall
survive the making by Lilly of the Loans regardless of any investigation made by
Lilly,  and shall  continue in full force and effect as long as the principal of
or any accrued interest on any Loan or any Fee or any other amount payable under
this  Agreement  is  outstanding  and  unpaid or the  Commitments  have not been
terminated.

         Section 7.03.  Binding Effect.  This Agreement  shall become  effective
when it shall have been executed by Somatogen and Lilly, and thereafter shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and assigns, except that Somatogen shall not have the Right to assign
any rights hereunder or any interest herein,  except in a transaction  permitted
by section 5.08 (b) (A) and (B), without the prior consent of Lilly.

         Section 7.04.  Successors and Assigns.

         (a)      Whenever  in  this  Agreement  any of the  parties  hereto  or
                  thereto is  referred  to,  such  reference  shall be deemed to
                  include the  successors  and  assigns of such  party;  and all
                  covenants,  promises  and  agreements  by or on  behalf of any
                  party  that are  contained  in this  Agreement  shall bind and
                  inure to the benefit of its successors and assigns.

         (b)      Neither  party shall  assign or delegate any of its rights and
                  duties  hereunder  without  the prior  written  consent of the
                  other party, and any attempt so to assign or delegate shall be
                  void; provided,  however, that Lilly may assign its rights and
                  delegate its duties hereunder to an Affiliate of Lilly upon 30
                  days' prior written notice to Somatogen.

         Section 7.05.  Expenses: Indemnity.

         (a)      Each party agrees to pay all reasonable out-of-pocket expenses
                  incurred by or on behalf of the other party in connection with
                  the enforcement of its rights under this Agreement,  including
                  the reasonable fees and disbursements of counsel.

         (b)      Somatogen agrees to indemnify Lilly, its Affiliates and the
                  directors, officers,employees and agents of the foregoing
                  (each such person being called an "Indemnitee") against, and
                  to hold each indemnitee harmless from, any and all losses,
                  claims, damages, liabilities and related expenses, including
                  reasonable counsel fees and expenses, incurred by or asserted
                  against any Indemnitee arising out of (i) the use of the
                  proceeds of the Loans or (ii) any claim, litigation,
                  investigation or proceeding relating thereto, whether or not
                  any Indemnitee is a party thereto; provided that such
                  indemnity shall not, as to any Indemnitee, be available to the
                  extent  that such  losses,  claims,  damages,  liabilities  or
                  related  expenses  resulted  from the  negligence  or  willful
                  misconduct of such Indemnitee.
<PAGE> 23

         (c)      The  provisions of this Section shall remain  operative and in
                  full force and effect regardless of the expiration of the term
                  of  this  Agreement,  the  consummation  of  the  transactions
                  contemplated  hereby,  the repayment of any of the Loans,  the
                  invalidity  or  unenforceability  of any term or  provision of
                  this  Agreement or any  investigation  made by or on behalf of
                  Lilly.  All amounts due under this Section shall be payable on
                  written demand therefor.

         Section 7.06.  Applicable Law.  THIS AGREEMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF INDIANA.

         Section 7.07.  Waivers: Amendment.

         (a)      No failure or delay of Lilly in exercising any power or right
                  hereunder shall operate as a waiver thereof, nor shall any
                  single or partial exercise of any such right or power, or any
                  abandonment or discontinuance of steps to enforce such a right
                  or power, preclude any other or further exercise thereof or
                  the exercise of any other right or power.  The rights and
                  remedies of Lilly hereunder are cumulative and are not
                  exclusive of any rights or remedies which it would otherwise
                  have.  No waiver of any provision of this Agreement or consent
                  to any departure therefrom shall in any event be effective
                  unless the same shall be permitted by paragraph (b) below,
                  and then such waiver or consent shall be effective only in the
                  specific instance and for the purpose for which given.  No
                  notice or demand on Somatogen or any Subsidiary in any case
                  shall entitle such party to any other or further notice or
                  demand in similar or other circumstances.

         (b)      Neither this Agreement nor any provision hereof may be waived,
                  amended  or  modified  except  pursuant  to  an  agreement  or
                  agreements in writing entered into by Somatogen and Lilly.

         Section 7.08. Entire Agreement.  This Agreement  constitutes the entire
contract among the parties  relative to the subject matter hereof.  Any previous
agreement  among the  parties  with  respect  to the  subject  matter  hereof is
superseded by this Agreement.  Nothing in this Agreement,  expressed or implied,
is intended  to confer upon any party other than the parties  hereto any rights,
remedies, obligations or liabilities under or by reason of this Agreement.

         Section  7.09.  Severability.  In the  event  any  one or  more  of the
provisions  contained  in this  Agreement  should be held  invalid,  illegal  or
unenforceable in any respect,  the validity,  legality and enforceability of the
remaining  provisions  contained  herein  shall  not in any way be  affected  or
impaired  thereby.  The parties  shall  endeavor in good faith  negotiations  to
replace the invalid,  illegal or unenforceable  provisions with valid provisions
the economic  effect of which comes as close as possible to that of the invalid,
illegal or unenforceable provisions.

<PAGE> 24

          Section 7.10.  Counterparts.  This Agreement may be executed in two or
more counterparts,  each of which shall  constitute an original but all of which
when taken together shall constitute but one contract.

         Section 7.11.  Headings.  Article and Section headings and the Table of
Contents used herein are for convenience of reference only, are not part of this
Agreement  and are not to  affect  the  construction  of,  or to be  taken  into
consideration in interpreting, this Agreement.

         Section  7.12.  Right of  Setoff.  If an Event of  Default  shall  have
occurred and be continuing, Lilly is hereby authorized at any time and from time
to time,  to the fullest  extent  permitted by law, to set off and apply any and
all  indebtedness  at any time  owing by Lilly  to  Somatogen  now or  hereafter
existing,  irrespective of whether or not such Lender shall have made any demand
under this  Agreement and although  such  obligations  may be  unmatured.  Lilly
agrees promptly to notify Somatogen after such setoff and  application,  but the
failure to give such  notice  shall not affect the  validity  of such setoff and
application.  The rights of Lilly  under this  Section  are in addition to other
rights and remedies (including other rights of setoff) which it may have.

         Section 7.13.  Jurisdiction and Venue.

         (a)      Somatogen hereby irrevocably and unconditionally submits, for
                  itself and its property, to the nonexclusive jurisdiction of
                  any Indiana State court or Federal court of the United States
                  of America sitting in the Southern District of Indiana, and
                  any appellate court from any thereof, in any action or
                  proceeding arising out of or relating to this Agreement, or
                  for recognition or enforcement of any judgment, and each of
                  the parties hereto hereby irrevocably and unconditionally
                  agrees that all claims in respect of any such action or
                  proceeding may be heard and determined in such Indiana State
                  or, to the extent permitted by law, in such Federal court.
                  Each of the parties hereto agrees that a final judgment in
                  any such action or proceeding shall be conclusive and may be
                  enforced in other jurisdictions by suit on the judgment or in
                  any other manner provided by law.  Subject to the foregoing
                  and to paragraph (b)below, nothing in this Agreement shall
                  affect any right that any party hereto may otherwise have to
                  bring any action or proceeding relating to this Agreement
                  against any other party hereto in the courts of any
                  jurisdiction.

         (b)      Each   of  the   parties   hereto   hereby   irrevocably   and
                  unconditionally  waives,  to the fullest extent it may legally
                  and  effectively  do so,  any  objection  which  it may now or
                  thereafter have to the laying of venue of any suit,  action or
                  proceeding arising out of or relating to this Agreement in any
                  Indiana  State or Federal  court.  Each of the parties  hereto
                  hereby irrevocably  waives, to the fullest extent permitted by
                  law, the defense of an  inconvenient  forum to the maintenance
                  of such action or proceeding in any such court.
<PAGE> 25

         Section   7.14.   Confidentiality.   Lilly   agrees  to  maintain   the
confidentiality  of the Information (as defined below),  except that Information
may be disclosed (a) to its and its affiliates' directors,  officers,  employees
and agents,  including  accountants,  legal counsel and other advisors (it being
understood  that the persons to whom such disclosure is made will be informed of
the  confidential  nature  of such  Information  and  instructed  to  keep  such
Information  confidential),   (b)to  the  extent  requested  by  any  regulatory
authority,  (c) to the extent  required by applicable  laws or regulations or by
any subpoena or similar legal  process,  (d) in connection  with the exercise of
any  remedies  hereunder  or any suit,  action or  proceeding  relating  to this
Agreement  or the  enforcement  of rights  hereunder,  (e) with the  consent  of
Somatogen or (f) to the extent such Information (i) becomes  publicly  available
other than as a result of a breach of this Section or (ii) becomes  available to
Lilly on a  nonconfidential  basis from a source other than  Somatogen.  For the
purposes of this  Section,  "Information"  means all  information  received from
Somatogen relating to Somatogen or its business, other than any such information
that is available to Lilly on a  nonconfidential  basis prior to  disclosure  by
Somatogen,  provided  that, in the case of  information  received from Somatogen
after the date hereof,  such  information  is clearly  identified at the time of
delivery as confidential. Any person required to maintain the confidentiality of
Information  as provided in this Section  shall be  considered  to have complied
with its  obligation  to do so if such person has  exercised  the same degree of
care to maintain the  confidentiality  of such  Information as such person would
accord to its own confidential information.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly  executed by their  respective  authorized  officers as of the day and year
first above written.

                                         ELI LILLY AND COMPANY



                                         By:    Edwin W. Miller

                                         Title: Vice President and Treasurer



                                         SOMATOGEN, INC.



                                         By:    Timothy D. Hoogheem

                                         Title: Senior Vice President of Finance
                                         and Administration, CFO and Treasurer


<PAGE> 26
Exhibit A - Form of Opinion of Counsel to Somatogen

July 28, 1997


Eli Lilly and Company
Lilly Corporate Center
Indianapolis, IN  46285


Ladies and Gentlemen:

We have acted as counsel  for  Somatogen,  Inc.,  a  Delaware  corporation  (the
"Borrower"),  in connection with the execution of the Revolving  Credit Facility
Agreement  dated as of July 28, 1997 by and between Eli Lilly and Company,  (the
"Lender") and Borrower  (the "Loan  Agreement").  We are rendering  this opinion
pursuant to Section  4.02a of the Loan  Agreement.  Except as otherwise  defined
herein, capitalized terms used but not defined herein have the meanings given to
them in the Loan Agreement.

In  connection  with  this  opinion,  we  have  examined  and  relied  upon  the
representations  and  warranties  as to factual  matters  contained  in and made
pursuant to the Loan  Agreement  by the various  parties and upon  originals  or
copies certified to our satisfaction of such records,  documents,  certificates,
opinions,  memoranda and other  instruments  as in our judgment are necessary or
appropriate to enable us to render the opinion expressed below.

Where we render an opinion "to the best of our  knowledge" or concerning an item
"known to us" or our  opinion  otherwise  refers to our  knowledge,  it is based
solely  upon (i) an inquiry of  attorneys  within  this firm who  perform  legal
services for the Borrower,  (ii) receipt of a certificate executed by an officer
of the Borrower covering such matters,  and (iii) such other  investigation,  if
any, that we specifically set forth herein.

In rendering this opinion,  we have assumed the genuineness and  authenticity of
all  signatures  on  original  documents;  the  authenticity  of  all  documents
submitted to us as  originals;  the  conformity  to  originals of all  documents
submitted  to us as copies;  the  accuracy,  completeness  and  authenticity  of
certificates  of public  officials;  and the due  authorization,  execution  and
delivery of all documents (except the due authorization,  execution and delivery
by Borrower of the Loan Agreement) where  authorization,  execution and delivery
are prerequisites to the  effectiveness of such documents.  We have also assumed
that all individuals  executing and delivering  documents had the legal capacity
to so execute and  deliver;  that you have  received all  documents  you were to
receive  under the Loan  Agreement;  that the Loan  Agreement  is an  obligation
binding upon you; and that there are no extrinsic  agreements or  understandings
among the parties to the Loan Agreement that would modify or interpret the terms
of the Loan  Agreement or the  respective  rights or  obligations of the parties
thereunder.

We have assumed that Lender will disburse the loan funds in accordance  with the
terms of the Loan Agreement and that at the time of each such  disbursement  all
facts and applicable law will be the same as those existing at closing.
<PAGE> 27

Our opinion is expressed  with respect only to the laws of the State of Colorado
and the Delaware  General  Corporation  Law. We express no opinion as to whether
the laws of any particular jurisdiction apply, and no opinion to the extent that
the  laws of any  jurisdiction  other  than  Colorado  or the  Delaware  General
Corporation  Law are  applicable to the subject  matter  hereof.  Our opinion is
expressed  only as to the outcome that would  pertain  were  Colorado law or the
Delaware  General  Corporation  Law  (excluding  choice  of law  principles  and
excluding the effect of any law other than Colorado law or the Delaware  General
Corporation  Law) the sole law  applicable  to the subject  matter  hereof.  For
purposes of this opinion, we have assumed,  with your permission,  that the laws
of Indiana are the same in all material respects as the laws of Colorado.

We express no opinion  relative to the  applicability or effect of any law, rule
or regulation relating to securities or to the sale or issuance thereof.

With  regard to our  opinion in  paragraph  2 below with  respect to defaults or
violations  under  any  material  agreement,  we have  relied  solely  upon  (i)
inquiries of officers of Borrower  and (ii) an  examination  of documents  which
Borrower has filed with the  Securities  and Exchange  Commission as exhibits to
either registration  statements filed pursuant to the Securities Act of 1933, as
amended or periodic  reports filed  pursuant to the  Securities  Exchange Act of
1934, as amended (the "Exchange Act") (the "Material Agreements");  we have made
no further  investigation.  With regard to the violation or breach of provisions
in the Material  Agreements  relating to financial covenants and other financial
and factual  matters we have relied solely on a certificate of an officer of the
Borrower that such  covenants will not be violated or breached by the execution,
delivery and performance by the Borrower of the terms of the Loan Agreement.

With regard to our opinion in paragraph 3, we have assumed with your  permission
that the Weighted Average Cost of Capital will not exceed 43.9%.

On the basis of the  foregoing,  in  reliance  thereon,  and with the  foregoing
qualifications, we are of the opinion that:

         1. Borrower (a) is a corporation  duly organized,  validly existing and
in good standing under the laws of the State of Delaware,  (b) has all requisite
corporate power and authority to own its property and assets and to carry on its
business as now conducted, (c) is, to the best of our knowledge, qualified to do
business in every  jurisdiction  where such  qualification  is required,  except
where the  failure to so qualify  would not have a  material  adverse  effect on
Borrower, and (d) has the corporate power and authority to execute,  deliver and
perform its obligations under the Loan Agreement and to borrow thereunder.

         2. The  execution,  delivery  and  performance  by Borrower of the Loan
Agreement and the Borrowings thereunder  (collectively,  the "Transactions") (a)
have been  duly  authorized  by all  requisite  corporate  action on the part of
Borrower  and (b) will not (i) result in a violation  having a material  adverse
effect on Borrower of (A) any provision of any law, statute,  rule or regulation
or of the certificate of incorporation or by laws of Borrower,  (B) any order of
any  Governmental  Authority  entered  against  Borrower known to us, or (C) any
provision  of any  Material  Agreement,  or (ii) be in material  conflict  with,
result in a material breach or constitute (alone or with notice or lapse of time
or both) a material default under any such Material Agreement.
<PAGE> 28

         3. The Loan Agreement constitutes a legal, valid and binding obligation
of  Borrower,   enforceable   in  accordance   with  its  terms  except  (i)  as
enforceability may be subject to or limited by rights to indemnity, contribution
or acceleration which may be limited by applicable laws; and (ii) as enforcement
may  be  limited  by  (a)  the  effect  of  applicable  bankruptcy,  insolvency,
reorganization,  arrangement,  moratorium,  receivership,  suretyship  or  other
similar laws  relating to or affecting  creditors'  rights;  (b) general  equity
principles and limitations on the  availability of equitable  relief,  including
specific  performance;  (c) compliance with the requirements,  and the effect of
the  limitations,  of Colorado  law  relating  to the  exercise of remedies by a
lender;  (d) limitations on a lender's ability to waive rights or benefits given
by  statute or  otherwise;  (e)  limitations  on the right of a lender to impose
added  charges  for  late  payments  or  defaults  by the  Company,  where it is
determined that such charges bear no reasonable  relation to the damage suffered
by the lender as a result of such late payments or defaults;  (f) limitations on
the  enforceability  of a clause  prohibiting  or  restricting  prepayment of an
indebtedness or imposing prepayment charges; (g) limitations imposed by Colorado
law on the  appointment  of  receivers;  (h) laws  with  respect  to  fraudulent
conveyance;  (i) limitations  created by or arising under statute or case law on
the  enforceability  of certain covenants and provisions of agreements where (x)
the breach of such covenants or provisions imposes  restrictions or burdens upon
the  Borrower,   including  the  acceleration  of  indebtedness  due  under  the
Indenture,   and  it  cannot  be  demonstrated  that  the  enforcement  of  such
restrictions or burdens is reasonably necessary for the protection of the lender
or (y) the  lender's  enforcement  of such  covenants  or  provisions  under the
circumstances would violate the lender's implied covenant of good faith and fair
dealing.

         4.  Other than the  filing of the Loan  Agreement  as an exhibit to the
Borrower's next periodic report filed under the Exchange Act, no action, consent
or approval of,  registration or filing with or other action by any governmental
authority  is  required  on  the  part  of  Borrower  in  connection   with  the
Transactions.

This opinion is intended solely for your benefit and is not to be made available
to or relied upon by any other person, firm, or entity without our prior written
consent.

Very truly yours,

Cooley Godward LLP


By: _________________



cc:  




AMENDMENT DATED JULY 23, 1997 TO EXCLUSIVE
AGENCY AGREEMENT WITH BINSWANGER CHESTERTON.



July 23, 1997


The Binswanger Companies
Two Logan Square, 4th Floor
18th and Arch Streets
Philadelphia, PA  19103-2759

Re:   Boulder, Colorado

Ladies and Gentlemen:

This letter is to confirm our  understanding  that the  Exclusive  Right to Sell
Agreement  dated  April 4, 1995,  as amended  July 1, 1996,  (the  "Agreement"),
pursuant to which you are acting as our exclusive  agent in connection  with the
sale of the Property.  Capitalized terms used herein without definition have the
meanings respectively assigned thereto in the Agreement. This extension shall be
on the same terms and conditions as contained in the Agreement, except as follow
and extended through December 31, 1997:

         1)   Notwithstanding any provision contained in the Agreement, the
              Company will not be obligated to pay to the Binswanger Companies
              ("Binswanger") any commission, fee or any other compensation,
              including, but not limited to the Commission Fee, lease commission
              or cancellation fee, pursuant to the Agreement or otherwise, if
              the Company sells, leases, conveys, or in any other way transfers
              the Property to any party that was introduced to the Company
              through an entity or individual (such entity or individual, an
              "Investment Bank") that has a written agreement with the Company
              which obligates the Company to pay a fee to such Investment Bank
              in connection with a transaction involving the Company.

                                           Very truly yours, SOMATOGEN, INC.


                                           By: Timothy D. Hoogheem

                                           Date: July 23, 1997


BINSWANGER OF COLORADO, INC.

By:  Susan Sygenda
     Corporate Council



FORM OF RETENTION AGREEMENT ENTERED INTO
BETWEEN THE REGISTRANT AND CERTAIN
EXECUTIVE OFFICERS


RESTRICTED & CONFIDENTIAL                            INTERNAL USE ONLY
SOMATOGEN, INC.

                             RETENTION AGREEMENT


         This  RETENTION  AGREEMENT  is  entered  into  as  of  (Date),  between
Somatogen, Inc., a Delaware corporation (the "Corporation"), and (Officer).

                                     RECITAL

         Officer  serves  as  the  Corporation's   (Officer's  Title),  and  the
Corporation  and the Officer desire to set forth herein the terms and conditions
of his/her  compensation in the event of the termination of his/her  employment,
following a Change in Control,  or Change of Management (as defined herein).  In
the event of a Change in Control, or Change of Management, the Officer and other
key employees may be more  vulnerable to dismissal  without regard to quality of
their service. Because such key employees are in a unique position to affect the
acquisition  effort by another party and are vulnerable in the event of a Change
of Management,  the Board of Directors of the Corporation (the "Board") believes
that it is in the best  interests of the  Corporation  and its  stockholders  to
enter into Agreements such as this one in order to ensure fair treatment of such
key employees and to reduce the distractions and other adverse effects upon such
employees'  performance  which are  inherent in such an  acquisition,  change in
control, or change of management.

                                 AGREEMENT

         The parties hereto agree as follows:

         1. Term.  If a Change in Control or Change of  Management  (as  defined
below) has not  occurred,  this  Agreement  shall expire two years from the date
hereof.  This  Agreement may be renewed by written  agreement of the parties for
successive one-year periods.  If a Termination  Following a Change in Control or
Change of Management  occurs during the term of this  Agreement,  this Agreement
shall  continue  in full  force and  effect  and shall not  terminate  until the
Officer shall have received the severance compensation provided hereunder.

         2.  Termination  Following a Change in Control or Change of Management.
In the  event of a  Termination  Following  a Change  in  Control  or  Change of
Management (as defined below), the Officer shall immediately be paid all accrued
salary,  bonus compensation to the extent earned,  vested deferred  compensation
(other than pension


<PAGE> 2



plan or profit sharing plan benefits,  which will be paid in accordance with the
applicable  plan), any benefits then due under any plans of Corporation in which
Officer is a  participant,  accrued  vacation pay and any  appropriate  business
expenses incurred by Officer in connection with his/her duties,  all to the date
of termination ("Accrued  Compensation").  The Officer shall also be entitled to
the severance compensation described in Section 3.

"Termination Following a Change in Control or Change of Management" shall mean a
termination  by the  Officer for Good  Reason (as  defined  below) of  Officer's
employment with Corporation  within one year after the occurrence of a Change in
Control  or  Change  of  Management  (as  defined  below)  or a  termination  by
Corporation  of Officer's  employment by  Corporation  within one year after the
occurrence  of a  Change  in  Control  or  Change  of  Management  other  than a
termination by reason of death or disability (as defined below) or a Termination
for Cause (as defined below).

         For purposes  hereof,  the following  terms shall have the meanings set
forth below.

         A  "Change  in  Control"  of the  Corporation  shall be  deemed to have
occurred if (i) any person (as such term is used in Sections 13(d) and 14(d) (2)
of the Securities and Exchange Act of 1934 (the "Exchange Act"),  other than the
Corporation,  is or becomes the beneficial owner (as defined in Rule 13D-3 under
the Exchange Act), directly or indirectly, of 50% or more of the combined voting
power of the outstanding shares of capital stock of the Corporation  entitled to
vote  generally  in the election of  directors  (calculated  as provided in Rule
13d-3(d) under the Exchange Act in the case of rights to acquire capital stock),
whether by means of a tender offer or exchange offer,  Transaction or otherwise;
or (ii) the Board or the stockholders of the Corporation  approve a Transaction.
A "Transaction" is: a) any consolidation or merger of the Corporation other than
a merger solely to effect a reincorporation or a merger of the Corporation as to
which stockholder approval is not required pursuant to Sections 251(f) or 253 of
the Delaware General  Corporation Law; or b) any sale, lease,  exchange or other
transfer (in one transaction or a series of related transactions) of 50% or more
of the assets of the Corporation; or c) the adoption of any plan or proposal for
the liquidation or dissolution of the Corporation.

         A  "Change  of  Management"  shall be deemed  to have  occurred  if the
Company's  current  Chief  Executive  Officer  ceases to serve as such, or a new
Chief Executive  Officer or Chief Operating Officer is appointed by the Board of
Directors.


<PAGE> 3




         "Disability" shall mean that the Officer, in the reasonable judgment of
the Board,  is  incapable  of  performing  the duties of his office by reason of
illness or physical or mental  disability,  which  condition has continued for a
period of more than three (3) consecutive months.

         "Good Reason" shall include any of the following:

                  (i) the assignment to the Officer by the Corporation of duties
         inconsistent with, or a substantial  alteration in the nature or status
         of, Officer's  responsibilities;  as in effect immediately prior to the
         Change in Control or Change of Management;

                  (ii) a reduction by  Corporation  in the  Officer's  salary or
         other  benefits  as in  effect on the date of a Change  in  Control  or
         Change of Management;

                  (iii)  a  relocation  of  Corporation's   principal  executive
         offices to a location  outside Boulder County,  Colorado,  or Officer's
         relocation to any place other than said offices of Corporation,  except
         for reasonably required travel by Officer on Corporation's business;

                  (iv) any material  breach by the  Corporation of any provision
         of this  Agreement,  if such material  breach has not been cured within
         thirty  (30)  days  following  written  notice  by the  Officer  to the
         Corporation of such breach setting forth with specificity the nature of
         the breach; or

                  (v) any failure by  Corporation  to obtain the  assumption  of
         this Agreement by any successor or assign of Corporation.

         "Termination  for  Cause"  shall  mean  termination  of  the  Officer's
employment by the Corporation by reason of the following:  (i) Officer's willful
dishonesty towards, fraud upon, crime against, deliberate or attempted injury or
bad faith action with respect to the Corporation;  or (ii) Officer's  conviction
for any felony crime (whether in connection  with the  Corporation's  affairs or
otherwise).

         3.       Severance Compensation.

                  a. Severance  Payments.  In the event of a Termination  Upon a
Change in Control or Change of Management,  the  Corporation  and Officer hereby
stipulate  and agree that the  Corporation  shall pay to the  Officer  severance
compensation in an aggregate amount equal to Officer's  compensation (as defined
below) for a period of twelve (12) months.


<PAGE> 4



Such  Compensation  shall be computed with reference to the Compensation paid to
the Officer for the last full  calendar  month  coinciding  with or  immediately
preceding  the month in which  the  Change in  Control  or Change of  Management
occurred or the month in which the Officer's  employment  terminates,  whichever
amount is  higher.  "Compensation"  of  Officer  means and  includes  all wages,
salary,   bonus  and  incentive   compensation   paid  by  the   Corporation  as
consideration  for the Officer's service that are includible in the gross income
of the Officer for federal  income tax  purposes,  (or are deferred by Officer's
elections or contributed to any employee  benefit plan on a pre-tax basis),  but
excluding any taxable  income  recognized  upon the exercise of stock options or
disposition of shares acquired upon the exercise of stock options.  Compensation
as to any month shall include: (i) one twelfth (1/12) of the amount of any bonus
or other lump sum  compensation  entitled to the Officer  during the  subsequent
twelve (12) months and all amounts  accrued with respect to such month under any
deferred  compensation  plan.  All  severance   compensation  shall  be  without
prejudice to Officer's right to receive all Accrued  Compensation (as defined in
Section  2)  earned  and  unpaid  up  to  the  time  of  termination.  Severance
compensation  payments to the Officer shall, at the Company's option, be paid in
a lump  sum,  or in equal  semi-monthly  installments  for  twelve  (12)  months
following the termination.  Severance  compensation  payments shall continue for
the  stipulated  twelve (12) months without  respect to the Officers  employment
status with any other organization or self employment.

                  b. Other  Severance  Provisions.  In addition to the severance
payments  described  above,  the  Corporation  will  either  (I)  reimburse  the
officer's COBRA premiums, or (ii) if permitted by the Corporation's health plan,
continue  in such  plans  at the  Corporation's  expense.  If  Officer's  health
insurance  coverage included the Officer's  dependents  immediately prior to the
Officer's termination, such dependents will also be covered at the Corporation's
expense. Continuation coverage under this Section 3(b) shall continue for twelve
(12) months after the Officer's  Termination  Upon a Change in Control or Change
of Management,  provided,  however, that such continuation of coverage shall end
as of the date the Officer  becomes  covered  under any other group  health plan
that is not maintained by the Corporation.

         4.  Acceleration  of Options.  In the event of  Termination,  all stock
options  held by the  Officer,  shall become  exercisable  in full,  even if the
vesting  conditions set forth therein have not been satisfied in full, and shall
remain exercisable for a period of 90 days if the Termination occurs following a
Change of Control  in which the  Company's  stock  exchanged  for  consideration
consisting of 75% or more cash, or a period of two (2) years following any other
Termination,  or a period of  twelve  (12)  months  in the event of  termination
because of the Officer's disability.


<PAGE> 5



         5. Other  Benefits.  Neither the  provisions of this  Agreement nor the
severance compensation provided for hereunder shall reduce any amounts otherwise
payable,  or in any way  diminish  the  Officer's  rights as an  employee of the
Corporation,  whether existing now or hereafter,  under any benefit,  incentive,
retirement,  stock option,  stock bonus,  stock purchase plan, or any employment
agreement or other plan or arrangement.

         6. Employment Status.  This Agreement does not constitute a contract of
employment or impose on the Officer or the  Corporation any obligation to retain
the Officer as an employee, or to change the status of the Officer's employment.
The Officer acknowledges that he or she is an "at-will" employee of the Company,
and that the Company may  terminate his or her  employment at any time,  with or
without cause.

         7.       Miscellaneous.

                  a.  Severability.  Should a court or other  body of  competent
jurisdiction  determine  that any  provision  of this  Agreement is excessive in
scope or otherwise  invalid or  unenforceable,  such provision shall be adjusted
rather than voided, if possible, so that it is enforceable to the maximum extent
possible.

                  b.  Withholding.  All compensation and benefits to the Officer
hereunder shall be reduced by all federal,  state,  local and other withholdings
and similar taxes and payments required by applicable law.

                  c.  Arbitration.  Except as provided in Section 3, the parties
hereby  submit all  controversies,  claims and matters of  difference in any way
related to this Agreement or the  performance or breach of the whole or any part
hereof to arbitration in Denver, Colorado,  according to the rules and practices
of the  American  Arbitration  Association  from time to time in force.  If such
rules and practices shall conflict with the Colorado Rules of Civil Procedure or
any other  provisions  of the  Colorado  Rules of Civil  Procedure  or any other
provisions  of Colorado law then in force,  such Colorado  rules and  provisions
shall govern. Arbitration of any such controversy, claim or matter of difference
shall be a condition precedent to any legal action thereon.  This submission and
agreement to  arbitration  shall be  specifically  enforceable.  Awards shall be
final and  binding on all  parties to the extent and in the manner  provided  by
Colorado  law.  All  awards  may be filed  by any  party  with the  Clerk of the
District Court in the County of Boulder,  Colorado,  and an appropriate judgment
entered  thereon and execution  issued  therefor.  At the election of any party,
said award may also be filed,  and judgment entered thereon and execution issued
therefor,  with the clerk of one or more other courts, state or federal,  having
jurisdiction  over the  party  against  whom  such an award is  rendered  or its
property.

<PAGE> 6

The  arbitrators  shall allocate the costs of the  arbitration in such manner as
they deem equitable,  and may require the  reimbursement  of all or a portion of
the reasonable  legal fees incurred by the prevailing  party in such arbitration
proceeding,  and any legal  proceedings  which are taken to enforce the arbitral
award.

                  d. Entire Agreement;  Modifications. This Agreement represents
the entire agreement between the parties and may be amended modified, superseded
or  canceled,  and any of the  terms  hereof  may be  waived,  only by a written
instrument  executed  by each party  hereto or, in the case of a waiver,  by the
party  waiving  compliance.  The  failure  of any  party at any time or times to
require  performance  of any  provision  hereof  shall not affect the right at a
latter  time to  enforce  the same.  No waiver by any party of the breach of any
provision contained in this Agreement,  whether by conduct or otherwise,  in any
one or more  instances,  shall be deemed  to be or  construed  as a  further  or
continuing waiver of any such breach or of any other term of this Agreement.

                  e.       Applicable Law.  This Agreement shall be construed
under and governed by the laws of the State of Colorado.

                  f.  Successors and Assigns.  This  agreement  shall be binding
upon,  and shall issue to the benefit of, the Company's  successors  and assigns
and the Executive's heirs and assigns.



         IN WITNESS  WHEREOF,  the parties have executed this  Agreement as of (
Date ).



                                        SOMATOGEN, INC.



                                        By______________________________


                                        OFFICER:



                                        ---------------------------------



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