LUMINEX CORP
S-1/A, 2000-03-27
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>


  As filed with the Securities and Exchange Commission on March 27, 2000
                                                      Registration No. 333-96317
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- --------------------------------------------------------------------------------
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                              AMENDMENT NO. 2
                                       to
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

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

                              LUMINEX CORPORATION
             (Exact name of registrant as specified in its charter)

<TABLE>
 <S>                               <C>                              <C>
             Delaware                            8731                          74-2747608
 (State or other jurisdiction of     (Primary Standard Industrial           (I.R.S. Employer
  incorporation or organization)     Classification Code Number)          Identification No.)
</TABLE>

                           12212 Technology Boulevard
                              Austin, Texas 78727
                                 (512) 219-8020
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
                                ----------------
                            Mark B. Chandler, Ph.D.
                      Chairman and Chief Executive Officer
                              Luminex Corporation
                           12212 Technology Boulevard
                              Austin, Texas 78727
                                 (512) 219-8020
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

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

                                   Copies to:
<TABLE>
<S>                                              <C>
              Craig N. Adams, Esq.                            Donald J. Murray, Esq.
          T. Christopher Pledger, Esq.                         Dewey Ballantine LLP
             Thompson & Knight LLP                         1301 Avenue of the Americas
      98 San Jacinto Boulevard, Suite 1200                   New York, New York 10019
              Austin, Texas 78701                                 (212) 259-8000
                 (512) 469-6100
</TABLE>
                                ----------------

        Approximate date of commencement of proposed sale to the public:
As soon as practicable after the effective date of this Registration Statement.

   If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. [_]

   If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]

   If this form is a post effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]

   If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]

   If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]

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

   The registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the registrant
shall file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until this Registration Statement shall become
effective on such date as the Securities and Exchange Commission, acting
pursuant to said Section 8(a), may determine.
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<PAGE>


PRELIMINARY PROSPECTUS                                       March 27, 2000
                             Subject to completion

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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+The information in this prospectus is not complete and may be changed. We may +
+not sell these securities until the registration statement filed with the     +
+Securities and Exchange Commission is effective. This preliminary prospectus  +
+is not an offer to sell these securities and is not soliciting an offer to    +
+buy these securities in any state where the offer or sale is not permitted.   +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
4,500,000 Shares


[LOGO OF LUMINEX APPEARS HERE]

Common Stock
- --------------------------------------------------------------------------------

This is our initial public offering of shares of our common stock. No public
market currently exists for our common stock. We expect the public offering
price to be between $17.00 and $19.00 per share.

The Nasdaq National Market has approved our common stock for quotation under
the symbol "LMNX."

Before buying any shares you should read the discussion of material risks of
investing in our common stock in "Risk factors" beginning on page 7.

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is
a criminal offense.

<TABLE>
<CAPTION>
                                        Per share Total
- -------------------------------------------------------
<S>                                     <C>       <C>
Public offering price                      $      $
- -------------------------------------------------------
Underwriting discounts and commissions     $      $
- -------------------------------------------------------
Proceeds, before expenses, to Luminex      $      $
- -------------------------------------------------------
</TABLE>

The underwriters may also purchase up to 675,000 shares of common stock from us
at the public offering price, less the underwriting discounts and commissions,
within 30 days from the date of this prospectus. The underwriters may exercise
this option only to cover over-allotments, if any. If the underwriters exercise
the option in full, the total underwriting discounts and commissions will be
$   , and the total proceeds, before expenses, to Luminex will be $   .

The underwriters are offering the common stock as set forth under
"Underwriting." Delivery of the shares will be made on or about     , 2000.

Warburg Dillon Read LLC
                   Lehman Brothers
                                                           Dain Rauscher Wessels
<PAGE>


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[Inside Front Cover]

Luminex

Representation of dyed microsphere during a bioassay using the LabMAP system.

[Inside Front Cover Gatefold]

LabMAP

The Technology

Luminex has developed a proprietary technology that combines a microscopic
fluid stream and digital signal processing to perform high-speed biological
tests at a low cost. This miniaturized biological testing format has broad
applications in pharmaceutical, clinical and biomedical research laboratories.

Representation of microsphere--Luminex dyes microscopic plastic beads, called
microspheres.

Representation of a set of 100 dyed microspheres--in 100 different
fluorescently colored sets.

Representation of microsphere with targeted antibodies on its surface--A
biological test occurs on the surface of each microsphere set.

Representation of four different dyed microspheres representing a bioassay
using the LabMAP system--This allows researchers to perform multiple biological
tests in the same sample.

[Inside Front Cover Gatefold]

A microscopic fluid stream carries each biological test through laser beams in
the Luminex 100, generating florescent signals which provide instantaneous test
results.

Representation of the microfluidic system including two small lasers.

Picture of the Luminex 100 product with XY platform and packaged microspheres.

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<PAGE>


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


Through and including        , 2000 (the 25th day after commencement of this
offering), federal securities law may require all dealers selling shares of our
common stock, whether or not participating in this offering, to deliver a
prospectus. This delivery requirement is in addition to the obligation of
dealers to deliver a prospectus when acting as underwriters and with respect to
their unsold allotments or subscriptions.

TABLE OF CONTENTS
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<TABLE>
<S>                                   <C>
Prospectus summary...................   3
The offering.........................   5
Summary financial and operating
  data...............................   6
Risk factors.........................   7
Forward-looking information..........  19
Use of proceeds......................  20
Dividend policy......................  20
Capitalization.......................  21
Dilution.............................  22
Selected financial data..............  24
Management's discussion and analysis
  of financial condition and results
  of operations......................  26
</TABLE>
<TABLE>
<S>                                <C>
Business.........................   31
Management.......................   46
Related party transactions.......   55
Principal stockholders...........   57
Description of capital stock.....   59
Shares eligible for future sale..   62
Underwriting.....................   64
Legal matters....................   66
Experts..........................   66
Where you can find more
  information....................   66
Index to financial statements....  F-1
</TABLE>

Luminex(R) and LabMAP(TM) are trademarks of Luminex Corporation. This
prospectus also refers to trademarks and trade names of other organizations.

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<PAGE>

                      (THIS PAGE INTENTIONALLY LEFT BLANK)
<PAGE>

Prospectus summary

This summary highlights information contained elsewhere in this prospectus. You
should read the entire prospectus carefully, especially the risks of investing
in our common stock which we discuss under "Risk factors." Our principal
executive offices are located at 12212 Technology Boulevard, Austin, Texas
78727. Our telephone number is (512) 219-8020. Our web site is
http://www.luminexcorp.com. We do not intend the information found on our web
site to be a part of this prospectus.

OUR BUSINESS

Luminex Corporation has developed, manufactures and markets a proprietary
technology that simplifies biological testing for the life sciences industry.
This industry depends on a broad range of tests, called bioassays, to discover
new drugs, identify new genes or simply monitor blood cholesterol levels. The
LabMAP system simultaneously performs up to 100 bioassays on a single drop of
fluid. We accomplish this with the Luminex 100, a compact instrument that reads
biological tests taking place on the surface of microscopic plastic beads
called microspheres. The Luminex 100 combines this miniaturized bioassay
capability with small lasers, digital signal processors and proprietary
software to create a system offering significant advantages in speed,
precision, flexibility and cost. We believe our LabMAP technology is broadly
applicable in the fields of drug discovery, clinical diagnostics, genetic
analysis and biomedical research.

We began marketing the current generation of LabMAP in 1999. As of February 29,
2000, 63 life sciences customers have purchased 114 LabMAP systems. Our
customers include Abbott Laboratories, Bio-Rad Laboratories, Inc., Centers for
Disease Control and Prevention, Eli Lilly and Company, GlaxoWellcome plc,
Laboratory Corporation of America, Lawrence Livermore National Laboratories,
Life Technologies, Inc., Mayo Clinic, National Institutes of Health and
SmithKline Beecham Corporation.

OUR MARKET OPPORTUNITY

The life sciences industry uses bioassays extensively to detect the presence of
certain biochemicals, proteins or genes in a sample. Drug discovery, genetic
analysis, pharmacogenomics, clinical diagnostics and general biomedical
research all broadly use bioassays. For example, bioassays can be used to:

 .measure the attraction, or affinity, between a chemical compound and a disease
 target for drug discovery and development;

 .assist physicians in prescribing the appropriate drug therapy to match the
 patient's unique genetic makeup, a process known as pharmacogenomics;

 .detect genetic variations, such as single nucleotide polymorphisms or SNPs;
 and

 .measure the presence and quantity of biochemicals in blood to assist
 physicians in diagnosing, treating and monitoring disease conditions such as
 heart attack or diabetes.

Laboratories either develop bioassays internally to meet their specific needs
or purchase them in the form of an off-the-shelf test kit or customized
service. Industry reports estimate the global market for

                                                                               3
<PAGE>

tools the drug discovery and development, clinical diagnostic and biomedical
research industries use to develop and perform bioassays to have been
approximately $27.5 billion in 1998 and expect it to grow at an annual rate of
7.2%. There are a number of factors contributing to this increase, including:

 .increased spending by pharmaceutical and biomedical research companies on
 research and development;

 .a shift in research and development focus from gene sequencing to determining
 the function of genes and their protein products, known as functional genomics
 and proteomics;

 .increased demand for disease-specific diagnostic tests;

 .application of disease targets from drug discovery into in vitro diagnostics;
 and

 .evolution of pharmacogenomics.

The differing bioassay needs of life sciences laboratories have led to the
development of specialized techniques and instrumentation. As a result, most of
these laboratories have become highly compartmentalized. For example, clinical
testing facilities organize into functional groups, such as chemistry,
microbiology, immunology and infectious disease. Similarly, pharmaceutical
companies organize their laboratories by disease target, such as cancer and
hypertension, as well as by the stages of the drug discovery process, from
initial bioassay development to toxicology. This has created inefficiencies in
laboratories since they must now purchase multiple instruments, often from
different vendors, to meet their testing needs. This limits the laboratories'
ability to standardize bioassay techniques, operator training and hardware
maintenance.

THE LUMINEX SOLUTION

Our solution is to provide a single platform, the LabMAP technology, that can
perform a wide range of bioassays in a cost-effective manner. The key features
of our platform include the following:

 .performs multiple tests simultaneously;

 .flexible in customizing bioassays comprised of multiple tests;

 .high rate, or throughput, of test results per day;

 .ease of use; and

 .low cost to purchase and operate.

OUR STRATEGY

Our goal is to establish our LabMAP system as the industry standard for
performing bioassays. To achieve this goal, we have implemented the following
strategy:

 .focus on large, fast-growing segments of the life sciences industry;

 .continue to develop strategic partnerships to broaden and accelerate market
 acceptance of our LabMAP technology;

 .provide an open platform that allows customers to design bioassays using a
 single platform;

 .expand the functionality of the LabMAP product line; and

 .allow easy technology access to encourage rapid market adoption.

4
<PAGE>


The offering

The following information assumes that the underwriters do not exercise the
over-allotment option granted to them to purchase additional shares in the
offering.

<TABLE>
 <C>                                         <S>
 Common stock we are offering............... 4,500,000 shares
 Common stock to be outstanding after the
   offering................................. 26,676,070 shares
 Proposed Nasdaq National Market symbol..... LMNX
 Use of proceeds............................ To fund our operations, including
                                             continued development and
                                             manufacturing of existing
                                             products and research and
                                             development of additional
                                             products, expanding our
                                             facilities to be able to meet the
                                             needs of our growing business,
                                             and for other working capital and
                                             general corporate purposes. See
                                             "Use of proceeds."
</TABLE>

Unless we indicate otherwise, when analyzing the information in this
prospectus, you should assume that all outstanding shares of our preferred
stock convert into 8,768,592 shares of our common stock upon the closing of
this offering.

At March 21, 2000, we were obligated to issue shares of common stock upon
exercise of options and warrants as follows:

 .4,231,134 shares issuable upon the exercise of options at a weighted average
 exercise price of $6.25 per share;

 .535,500 shares issuable upon the exercise of warrants at an exercise price of
 $1.96 per share; and

 .2,587,500 additional shares available for future grant under our 2000 Long-
 Term Incentive Plan. See "Management -- Employee benefit plans --  2000 Long-
 Term Incentive Plan."

In addition, we have agreed to issue an additional 675,000 shares if the
underwriters exercise their over-allotment option in full, which we describe in
"Underwriting". If the underwriters exercise this option in full, 27,351,070
shares of common stock will be outstanding after this offering.

We base our calculation of the number of shares of common stock outstanding
after the offering on shares outstanding as of March 21, 2000. See
"Capitalization."

                                                                               5
<PAGE>

Summary financial and operating data

The as adjusted balance sheet reflects the receipt of the net proceeds from the
sale of 4,500,000 shares of our common stock in this offering at an assumed
price to the public of $18.00 per share, after deducting the underwriting
discounts and commissions and estimated offering expenses. The pro forma net
loss per share and shares used in computing pro forma net loss per share are
calculated as if all of our convertible preferred stock was converted into
shares of our common stock on the date of their issuance.

<TABLE>
<CAPTION>
                                PERIOD FROM
                               MAY 24, 1995
                             (INCEPTION) TO      YEAR ENDED DECEMBER 31,
                          DECEMBER 31, 1995     1996     1997     1998      1999
STATEMENT OF OPERATIONS
DATA                             (In thousands, except per share data)
- ---------------------------------------------------------------------------------
<S>                       <C>                <C>      <C>      <C>      <C>
Revenue:
 Product................                $--      $--      $99     $386    $2,606
 Grant..................                 --       --       --       --       506
                                     ------  -------  -------  -------  --------
  Total revenue.........                 --       --       99      386     3,112
Cost of product
   revenue..............                 --       --       10       88     1,172
                                     ------  -------  -------  -------  --------
Gross margin............                 --       --       89      298     1,940
Operating expenses:
 Research and
    development.........                 58    1,036    1,594    3,611     6,188
 Selling, general and
    administrative......                216      731    1,426    2,566     5,238
                                     ------  -------  -------  -------  --------
  Total operating
     expenses...........                274    1,767    3,020    6,177    11,426
                                     ------  -------  -------  -------  --------
Loss from operations....               (274)  (1,767)  (2,931)  (5,879)   (9,486)
Interest income.........                  4        7      178      283       284
                                     ------  -------  -------  -------  --------
Net loss................               (270)  (1,760)  (2,753)  (5,596)   (9,202)
Accretion of discount on
   convertible preferred
   stock................                 --       --       --       --    (3,406)
                                     ------  -------  -------  -------  --------
Net loss applicable to
   common stockholders..             $ (270) $(1,760) $(2,753) $(5,596) $(12,608)
                                     ======  =======  =======  =======  ========
Net loss per share,
   basic and diluted....             $(0.06)  $(0.16)  $(0.21)  $(0.43)   $(0.96)
                                     ======  =======  =======  =======  ========
Shares used in computing
   net loss per share,
   basic and diluted....              4,531   10,826   12,842   13,086    13,151
Pro forma net loss per
   share, basic and
   diluted..............                                                  $(0.45)
                                                                        ========
Shares used in computing
   pro forma net loss
   per share, basic and
   diluted..............                                                  20,529
</TABLE>

<TABLE>
<CAPTION>
                                                            AS OF DECEMBER 31,
                                                                   1999
                                                             ACTUAL AS ADJUSTED
BALANCE SHEET DATA                                            (In thousands)
- -------------------------------------------------------------------------------
<S>                                                         <C>     <C>
Cash and cash equivalents..................................  $4,083     $78,713
Working capital............................................  10,426      85,056
Total assets...............................................  12,566      87,196
Total stockholders' equity.................................  11,195      85,825
</TABLE>

Please see Note 2 to our financial statements for an explanation of the method
used to calculate the net loss per share and the number of shares used in the
computation of per share amounts.

6
<PAGE>


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Risk factors

You should carefully consider the risks described below together with all of
the other information included in this prospectus before making an investment
decision. If any of the following risks actually occurs, our business,
financial condition or results of operations could be harmed. In such an event,
the trading price of our common stock could decline, and you may lose all or
part of your investment.

RISKS RELATED TO OUR BUSINESS

WE MAY NOT BE ABLE TO SUCCESSFULLY IMPLEMENT OUR BUSINESS PLAN OR ADAPT IT TO
CHANGES IN THE MARKET.

We are at an early stage of development, and our business model is still
evolving. As a result, we are subject to all of the risks inherent in the
development of new commercial products, such as the need:

 .to obtain substantial capital to support the expenses of developing our
 technology and commercializing our products;

 .to develop a market for our products; and

 .to successfully transition from a company with a research focus to a company
 capable of supporting commercial activities.

Since commencing operations in May 1995, we have dedicated substantially all of
our resources to the research and development of our products. Because we have
only recently begun to market our products commercially, we have generated
limited revenues from product sales.

WE CANNOT ASSURE YOU THAT WE WILL EVER ACHIEVE OR SUSTAIN PROFITABILITY OR THAT
OUR OPERATING LOSSES WILL NOT INCREASE IN THE FUTURE.

We have incurred operating losses and negative cash flow from operations since
our inception. As of December 31, 1999, we had an accumulated deficit of $23.0
million. For the years ended December 31, 1997, 1998 and 1999, we had net
losses of $2.8 million, $5.6 million and $9.2 million, respectively. We expect
to continue to incur operating and net losses and negative cash flow from
operations, which may increase, for the foreseeable future due in part to
anticipated increases in expenses for research and product development and
expansion of our facilities and sales and marketing capabilities. We anticipate
that our business will generate operating losses until we successfully
implement our commercial development strategy and generate significant
additional revenues to support our level of operating expenses.

IF OUR TECHNOLOGY AND PRODUCTS DO NOT BECOME WIDELY USED IN THE LIFE SCIENCES
INDUSTRY, IT IS UNLIKELY THAT WE WILL EVER BECOME PROFITABLE.

Life sciences companies have historically conducted screening and
identification tests using a variety of technologies, including bead-based
screening. However, compared to other technologies, the LabMAP technology is
new and unproven, and the use of our technology by life sciences companies is
limited. The commercial success of our technology will depend upon the adoption
of this technology as a method to perform bioassays. In order to be successful,
our products must meet the commercial

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                                                                               7
<PAGE>

Risk factors

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

requirements for bioassays within the life sciences industry, and we must
convince potential customers to utilize our system instead of competing
technologies. Market acceptance will depend on many factors, including our
ability to:

 .convince prospective strategic partners and customers that our technology is
 an attractive alternative to other technologies for pharmaceutical, clinical
 and biomedical testing and analysis;

 .manufacture products in sufficient quantities with acceptable quality and at
 an acceptable cost; and

 .place and service sufficient quantities of our products.

Because of these and other factors, our products may not gain market
acceptance.

Our business plan may not succeed unless we establish meaningful and successful
relationships with our strategic partners.

Our strategy for the development and commercialization of our LabMAP technology
depends in part upon our ability to establish strategic relationships with a
number of partners. Our business plan contemplates that a significant portion
of our future revenues will come from sales of our systems, the development and
sale of bioassay kits utilizing our technology and use of our technology by our
strategic partners in performing services offered to third parties. This
strategy entails a number of risks as more fully described below.

If we cannot establish and maintain sufficient effective strategic
partnerships, we will not be able to create sufficient market demand for our
products.

Our success depends on our ability to maintain our current strategic
partnerships and establish and maintain additional partnerships. Our ability to
enter into agreements with additional partners depends in part on convincing
them that our technology can help achieve and accelerate their goals or
efforts. This may require substantial time and effort on our part. We will
expend substantial funds and management effort with no assurance that a
strategic relationship will result. We cannot assure you that we will be able
to negotiate additional strategic agreements in the future on acceptable terms,
if at all, or that current or future partners will not pursue or develop
alternative technologies either on their own or in collaboration with others.
Termination of strategic relationships, or the failure to enter into a
sufficient number of additional agreements on favorable terms, could reduce
sales of our products or lower margins on our products.

If our strategic partners do not effectively develop and market products based
on our technology, our ability to generate revenues will be diminished.

In return for the right to produce bioassay kits incorporating our technology,
our strategic partners will purchase our systems from us for resale to end-
users and will pay royalties to us based on revenues they generate from sales
of the kits. We expect that we will also generate revenue from royalties on
sales of diagnostic testing services by strategic partners utilizing our
technology. This strategy entails a number of risks. We believe that our
strategic partners will have economic incentives to market these products, but
we cannot predict future sales and royalty revenues because our strategic
partner agreements do not include minimum purchase requirements. The amount of
these revenues will depend on a variety of factors that are outside our
control, including the amount and timing of resources that current and future
strategic partners devote to market products incorporating our technology. Some
of the companies we are targeting as strategic partners offer products
competitive with our LabMAP

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

8
<PAGE>

Risk factors

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

technology. As a result, competition with these companies may hinder or prevent
strategic relationships. Further, the development and marketing of certain
bioassay kits will require our strategic partners to obtain governmental
approvals, which could delay or prevent their commercialization efforts. If our
current or future strategic partners do not effectively develop and market
products based on our technology and obtain any necessary government approvals,
our revenues from product sales and royalties will be significantly reduced.

We have only produced our products in limited quantities, and we may experience
manufacturing problems or delays that could limit the growth of our revenue.

We currently produce products incorporating our LabMAP technology in limited
quantities. If we successfully develop and introduce these products to the
marketplace, we may not be able to produce sufficient quantities at an
acceptable cost. In addition, we may encounter difficulties in production due
to, among other things, quality control and assurance and component supply.
These difficulties could result in reduced sales of our products, increased
repair or re-engineering costs due to product returns and defects as well as
increased expenses due to switching to alternative suppliers, all of which
could damage our industry reputation and hurt our profitability.

Because we have limited sources of production and suppliers, our ability to
produce and supply our products could be impaired.

We have limited experience producing products for commercial purposes. We
presently outsource most of the assembly of our products to contract
assemblers. In addition, certain key components of our product line are
currently purchased from a limited number of outside sources and may only be
available through a few sources. We do not have agreements with any of our
suppliers or certain of our contract assemblers.

Our reliance on our suppliers and contract assembler exposes us to risks
including:

 .the possibility that one or more of our suppliers or assemblers could
 terminate their services at any time without penalty;

 .the potential inability of our suppliers to obtain required components;

 .the potential delays and expenses of seeking alternative sources of supply or
 manufacturing services; and

 .reduced control over pricing, quality and timely delivery due to the
 difficulties in switching to alternative suppliers or assemblers.

Consequently, in the event that components from our suppliers or work performed
by our assembler are delayed or interrupted for any reason, our ability to
produce and supply our products could be impaired.

We have limited experience in selling and marketing our products and may not be
able to develop a direct sales and marketing force that can meet our customers'
needs.

We intend to sell a portion of our products through our own sales force. We
have limited experience in direct marketing, sales and distribution. Our future
profitability will depend in part on our ability to

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

                                                                               9
<PAGE>

Risk factors

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

further develop a direct sales and marketing force to sell our products to our
customers. Our products are technical in nature. As a result, we believe it is
necessary to develop a direct sales force that includes people with scientific
backgrounds and expertise. Competition for such employees is intense. We may
not be able to attract and retain qualified salespeople or be able to build an
efficient and effective sales and marketing force. Failure to attract or retain
qualified salespeople or to build an efficient and effective sales and
marketing force could negatively impact sales of our products, thus reducing
our revenues and profitability.

If we cannot provide quality customer service, we could lose customers and our
operating results could suffer.

Our inability to attract, train or retain the number of highly qualified
customer support and technical services personnel that our business needs may
cause our business and prospects to suffer. We are currently expanding these
areas and will need to increase our staff further to support expected new
customers as well as the expanding needs of existing customers. The
introduction of our products to new customers, the integration of our
technology into our customers' existing systems and the ongoing customer
support can be complex. Accordingly, we need highly trained customer support
and technical personnel. Hiring customer support and technical personnel is
very competitive in our industry due to the limited number of people available
with the necessary technical skills and understanding of our systems and
services.

Our business plan contemplates a period of rapid and substantial growth that
will place a strain on our administrative and operational infrastructure.

We increased the number of our employees from 47 at December 31, 1998 to 87 at
February 29, 2000. Our product revenue increased from $386,000 in 1998 to $2.6
million in 1999. Our ability to manage effectively our operations and growth
requires us to continue to improve our operational, financial and management
controls, reporting systems and procedures. We may not successfully implement
improvements to our management information and control systems in an efficient
or timely manner and may discover deficiencies in existing systems and
controls.

Our research and development efforts may not produce commercially viable
products.

We intend to devote significant personnel and financial resources to research
and development activities designed to advance the capabilities of our LabMAP
technology. Some of these research and development activities will be conducted
by others. We may never realize any benefits from such research and development
activities.

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

10
<PAGE>

Risk factors

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


RISKS RELATED TO OPERATING IN OUR INDUSTRY

The life sciences industry is highly competitive and subject to rapid
technological change, and we may not have the resources necessary to
successfully compete.

We compete with companies in the United States and abroad that are engaged in
the development and production of similar products. We anticipate competition
primarily from the following two sectors:

 .companies marketing conventional testing products based on established
 technologies; and

 .companies developing their own advanced testing technologies.

Many of our competitors have access to greater financial, technical, research,
marketing, sales, distribution, service and other resources than we do. We
face, and will continue to face, intense competition from organizations serving
the life sciences industry that are pursuing competing technologies. These
organizations may develop technologies that are superior alternatives to our
technologies. Further, our competitors may be more effective at implementing
their technologies to develop commercial products.

The life sciences industry is characterized by rapid and continuous
technological innovation. We may need to develop new applications for our
products to remain competitive. Our present or future products could be
rendered obsolete or uneconomical by technological advances by one or more of
our current or future competitors. In addition, the introduction or
announcement of new products by us or by others could result in a delay of or
decrease in sales of existing products, as customers evaluate these new
products. Our future success will depend on our ability to compete effectively
against current technology as well as to respond effectively to technological
advances.

Our success will depend on our ability to retain principal members of our
management and scientific staff.

We depend on the principal members of our management and scientific staff. The
loss of services of any of these persons could delay or reduce our product
development and commercialization efforts. In addition, recruiting and
retaining qualified scientific personnel to perform future research and
development work will be critical to our success. There is a shortage in our
industry of qualified management and scientific personnel, and competition for
these individuals is intense. There can be no assurance that we will be able to
attract additional and retain existing personnel.

The intellectual property rights we rely upon to protect the technology
underlying our products may not be adequate, which could enable third parties
to use our technology or very similar technology and could reduce our ability
to compete in the market.

Our success will depend on our ability to obtain, protect and enforce patents
on our technology and to protect our trade secrets. Any patents we own may not
afford meaningful protection for our technology and products. Others may
challenge our patents and, as a result, our patents could be narrowed,
invalidated or rendered unenforceable. In addition, our current and future
patent applications may not result in the issuance of patents in the United
States or foreign countries. Competitors may develop products similar to ours
which are not covered by our patents. Further, there is a substantial backlog
of patent applications at the US Patent and Trademark Office, and the approval
or rejection of patent applications may take several years.

We have obtained a patent in the United States and have pending applications in
certain foreign jurisdictions, except Japan, for our method of "real time"
detection and quantification of multiple

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

                                                                              11
<PAGE>

Risk factors

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

analytes from a single sample. We have filed a lawsuit alleging that as a
result of our prior patent counsel's negligence the corresponding patent
application in Japan was not obtained. We are seeking damages caused by this
negligence. We intend, however, to pursue patent protection in Japan for other
aspects of our technology. As a result, we may not be able to prevent
competitors from developing and marketing technologies similar to our LabMAP
technology in Japan.

We require our employees, consultants and advisors to execute confidentiality
agreements. However, we cannot guarantee that these agreements will provide us
with adequate protection against improper use or disclosure of confidential
information. In addition, in some situations, these agreements may conflict
with, or be subject to, the rights of third parties with whom our employees,
consultants or advisors have prior employment or consulting relationships.
Further, others may independently develop substantially equivalent proprietary
information and techniques, or otherwise gain access to our trade secrets. Our
failure to protect our proprietary information and techniques may inhibit or
limit our ability to exclude certain competitors from the market.

We may be involved in lawsuits to protect or enforce our intellectual property
rights, which may be expensive. If we lose, we may lose the benefit of some of
our intellectual property rights, the loss of which may inhibit or remove our
ability to exclude certain competitors from the market.

In order to protect or enforce our patent rights, we may have to initiate legal
proceedings against third parties, such as infringement suits or interference
proceedings. These legal proceedings could be expensive, take significant time
and divert management's attention from other business concerns. We may also
provoke these third parties to assert claims against us. The patent position of
companies like ours generally is highly uncertain, involves complex legal and
factual questions, and has recently been the subject of much litigation. No
consistent policy has emerged from the US Patent and Trademark Office or the
courts regarding the breadth of claims allowed or the degree of protection
afforded under patents like those we own.

Our success will depend partly on our ability to operate without infringing on
or misappropriating the proprietary rights of others.

We may be sued for infringing on the intellectual property rights of others. In
addition, we may find it necessary, if threatened, to initiate a lawsuit
seeking a declaration from a court that we do not infringe the proprietary
rights of others or that these rights are invalid or unenforceable.
Intellectual property litigation is costly, and, even if we prevail, the cost
of such litigation could affect our profitability. In addition, litigation is
time consuming and could divert management attention and resources away from
our business. If we do not prevail in any litigation, in addition to any
damages we might have to pay, we could be required to stop the infringing
activity or obtain a license. Any required license may not be available to us
on acceptable terms, or at all. In addition, some licenses may be nonexclusive,
and therefore, our competitors may have access to the same technology licensed
to us. If we fail to obtain a required license or are unable to design around a
patent, we may be unable to sell some of our products, which could have a
material adverse affect on our business, financial condition and results of
operations.

We are aware of a European patent granted to Dr. Ioannis Tripatzis, which
covers certain testing agents and certain methods of their use. Dr. Tripatzis
has publicly stated his belief that his patent covers aspects of our
technology. This patent expires in 2004. We cannot assure you that a dispute
with Dr. Tripatzis will not arise or that any dispute with him will be resolved
in our favor.

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

12
<PAGE>

Risk factors

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


If we fail to comply with the extensive governmental regulations that affect
our business, we could be subject to enforcement actions, injunctions and civil
and criminal penalties that could delay or prevent marketing of our products.

The production, labeling, distribution and marketing of our products for some
purposes and products based on our technology expected to be produced by our
strategic partners are subject to governmental regulation by the United States
Food and Drug Administration in the United States and by similar agencies in
other countries. Depending on their intended applications, some of our products
and products based on our technology expected to be produced by our strategic
partners are subject to approval or clearance by the FDA prior to marketing for
commercial use. Products using our technology for clinical diagnostic purposes
will require such approval or clearance. No such approvals or clearances have
yet been obtained. The process of obtaining necessary FDA clearances or
approvals can be time-consuming, expensive and uncertain. Further, clearance or
approval may place substantial restrictions on the indications for which the
product may be marketed or to whom it may be marketed. In addition, we are also
required to comply with FDA requirements relating to laser safety.

Approved or cleared products are subject to continuing FDA requirements
relating to quality control and quality assurance, maintenance of records and
documentation and labeling and promotion of medical devices. Our inability, or
the inability of our strategic partners, to obtain required regulatory approval
or clearance on a timely or acceptable basis could harm our business. In
addition, failure to comply with applicable regulatory requirements could
subject us or our strategic partners to enforcement action, including product
seizures, recalls, withdrawal of clearances or approvals, restrictions on or
injunctions against marketing our products or products based on our technology,
and civil and criminal penalties.

Medical device laws and regulations are also in effect in many countries
outside the United States. These range from comprehensive device approval
requirements for some or all of our medical device products to requests for
product data or certifications. The number and scope of these requirements are
increasing. Failure to comply with applicable federal, state and foreign
medical device laws and regulations may harm our business, financial condition
and results of operations.

We are also subject to a variety of other laws and regulations relating to,
among other things, environmental protection and work place safety. See
"Business -- Government regulation."

If we become subject to product liability claims, we may be required to pay
damages that exceed our insurance coverage.

Our business exposes us to potential product liability claims that are inherent
in the testing, production, marketing and sale of human diagnostic and
therapeutic products. While we believe that we are reasonably insured against
these risks, there can be no assurance that we will be able to obtain insurance
in amounts or scope sufficient to provide us with adequate coverage against all
potential liabilities. A product liability claim in excess of our insurance
coverage or a recall of one of our products would have to be paid out of our
cash reserves.

Some of our programs are partially supported by government grants, which may be
reduced, withdrawn or delayed.

We have received and may continue to receive funds under United States
government research and technology development programs. Funding by the
government may be significantly reduced in the future for a number of reasons.
For example, some programs are subject to a yearly appropriations

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                                                                              13
<PAGE>

Risk factors

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

process in Congress. Additionally, we may not receive funds under existing or
future grants because of budgeting constraints of the agency administering the
program. We cannot assure you that we will receive significant funding under
government grants.

A portion of our sales have been to universities, government research
laboratories, private foundations and other institutions, where funding is
dependent on grants from government agencies such as the National Institutes of
Health. The funding associated with approved NIH grants for instrumentation
generally becomes available at particular times of the year, as determined by
the government. Although research funding has increased during the past several
years, grants have, in the past, been frozen for extended periods or have
otherwise become unavailable to various institutions, sometimes without advance
notice. Furthermore, increasing political pressures in the United States to
reduce or eliminate budgetary deficits may result in reduced allocations to the
NIH and the other government agencies that fund research and development
activities. If government funding, especially NIH grants, necessary to purchase
our products were to become unavailable to researchers for any extended period
of time or if overall research funding were to decrease, our sales could
decline.

Because we receive revenues principally from life science companies, the
capital spending policies of these entities have a significant effect on the
demand for our products.

Our customers include pharmaceutical, biotechnology, chemical and industrial
companies, and the capital spending policies of these companies can have a
significant effect on the demand for our products. These policies are based on
a wide variety of factors, including the resources available for purchasing
research equipment, the spending priorities among various types of research
equipment and the policies regarding capital expenditures during recessionary
periods. Any decrease in capital spending by life sciences companies could
cause our revenues to decline and impact our profitability.

If third-party payors increasingly restrict payments for health care expenses,
we may experience reduced sales which would hurt our business and our business
prospects.

Third-party payors, such as government entities, health maintenance
organizations and private insurers, are restricting payments for health care.
These restrictions may decrease demand for our products and the price we can
charge. Increasingly, Medicaid and other third-party payors are challenging the
prices charged for medical services, including clinical diagnostic tests. They
are also attempting to contain costs by limiting coverage and the reimbursement
level of tests and other health care products. Without adequate coverage and
reimbursement, consumer demand for tests will decrease. Decreased demand could
cause sales of our products, and sales and services by our strategic partners,
to fall. In addition, decreased demand could place pressure on us or our
strategic partners to lower prices on these products or services, resulting in
lower margins. Reduced sales or margins by us or our strategic partners would
hurt our business, profitability and business prospects.

RISKS RELATED TO THIS OFFERING

Our products have lengthy sales cycles, which could cause our operating results
to fluctuate significantly from quarter to quarter.

The sale of bioassay testing devices typically involves a significant technical
evaluation and commitment of capital by customers. Accordingly, the sales cycle
associated with our products is expected to be lengthy and subject to a number
of significant risks, including customers' budgetary constraints and

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

14
<PAGE>

Risk factors

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

internal acceptance reviews that are beyond our control. Due to this lengthy
and unpredictable sales cycle, our operating results could fluctuate
significantly from quarter to quarter. We expect to continue to experience
significant fluctuations as a result of a variety of factors, many of which are
outside of our control. The following factors could affect our operating
results:

 .market acceptance of our products;

 .the timing and willingness of strategic partners to commercialize our products
 which would result in royalties;

 .expiration of contracts with strategic partners or government research grants,
 which may not be renewed or replaced; and

 .general and industry specific economic conditions, which may affect our
 collaborative partners' research and development expenditures.

A large portion of our expenses, including expenses for facilities, equipment
and personnel, are relatively fixed. Accordingly, if revenues decline or do not
grow as anticipated, we might not be able to correspondingly reduce our
operating expenses. In addition, we plan to significantly increase operating
expenses in 2000. Failure to achieve anticipated levels of revenues could
therefore significantly harm our operating results for a particular fiscal
period.

Due to the possibility of fluctuations in our revenues and expenses, we believe
that quarter-to-quarter comparisons of our operating results are not a good
indication of our future performance. Our operating results in some quarters
may not meet the expectations of stock market analysts and investors. In that
case, our stock price would probably decline.

Our stock price could be volatile, and your investment could suffer a decline
in value.

The trading price of our common stock is likely to be highly volatile and could
be subject to wide fluctuations in price in response to various factors, many
of which are beyond our control, including:

 .actual or anticipated variations in quarterly operating results;

 .announcements of technological innovations by us or our competitors;

 .new products or services introduced or announced by us or our competitors;

 .changes in financial estimates by securities analysts;

 .conditions or trends in the biotechnology and pharmaceutical industries;

 .announcements by us of significant acquisitions, strategic partnerships, joint
 ventures or capital commitments;

 .additions or departures of key personnel; and

 .sales of our common stock.

In addition, the stock market in general, and the Nasdaq National Market and
the market for technology companies in particular, has experienced significant
price and volume fluctuations that have often been unrelated or
disproportionate to the operating performance of those companies. Further,

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                                                                              15
<PAGE>

Risk factors

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

there has been particular volatility in the market prices of securities of life
sciences companies. These broad market and industry factors may seriously harm
the market price of our common stock, regardless of our operating performance.
In the past, following periods of volatility in the market price of a company's
securities, securities class action litigation has often been instituted. A
securities class action suit against us could result in substantial costs,
potential liabilities and the diversion of management's attention and
resources.

There may not be an active, liquid trading market for our common stock.

Prior to this offering, there has been no public market for our common stock.
We cannot assure you that an active trading market for our common stock will
develop following this offering. You may not be able to sell your shares
quickly or at the market price if trading in our stock is not active. The
initial public offering price will be determined by negotiations between us and
representatives of the underwriters based upon a number of factors. The initial
public offering price may not be indicative of prices that will prevail in the
trading market. See "Underwriting" for more information regarding our
arrangement with the underwriters and the factors considered in setting the
initial public offering price.

Our principal stockholders, directors and executive officers will own
approximately 55.0% of our common stock, which may prevent new investors from
influencing corporate decisions.

After this offering, our stockholders who currently own over 5% of our common
stock, our directors and executive officers will beneficially own approximately
55.0% of our outstanding common stock or 53.7% if the underwriters exercise
their over-allotment option in full. These stockholders will be able to
exercise significant influence over all matters requiring stockholder approval,
including the election of directors and the approval of significant corporate
transactions. This concentration of ownership may also delay or prevent a
change in control of the company even if beneficial to our stockholders. See
"Principal stockholders" for additional information on the concentration of
ownership of our common stock.

Future sales of our common stock may depress our stock price.

The market price of our common stock could decline as a result of sales of
substantial amounts of our common stock in the public market after the closing
of this offering, or the perception that these sales could occur. In addition,
these factors could make it more difficult for us to raise funds through future
offerings of common stock. There will be 26,676,070 shares of common stock
outstanding immediately after this offering, or 27,351,070 shares if the
underwriters exercise their over-allotment option in full, based on the number
of shares outstanding at March 21, 2000. All of the shares sold in the offering
will be freely transferable without restriction or further registration under
the Securities Act, except for any shares purchased by our "affiliates," as
defined in Rule 144 of the Securities Act. The remaining 22,176,070 shares of
common stock outstanding will be "restricted securities" as defined in Rule
144. These shares may be sold in the future without registration under the
Securities Act to the extent permitted by Rule 144 or other exemptions under
the Securities Act.

Approximately 180 days after this offering, we intend to register approximately
4,231,134 shares of common stock which are reserved for issuance upon exercise
of options granted under our stock option plan. Once we register these shares,
they can be sold in the public market upon issuance, subject to restrictions
under the securities laws applicable to resales by affiliates. See "Shares
eligible for future sale."

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16
<PAGE>

Risk factors

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


You will experience immediate and substantial dilution.

The initial public offering price of our common stock is expected to be
substantially higher than the net tangible book value per share of our common
stock. Therefore, if you purchase shares of our common stock in this offering,
you will incur immediate and substantial dilution of approximately $14.75 in
the pro forma net tangible book value per share of common stock from the price
per share that you pay for the common stock (based upon an assumed initial
public offering price of $18.00 per share). If the holders of outstanding
options or warrants exercise those options or warrants at prices below the
initial public offering price, you will incur further dilution.

If we need but are unable to obtain additional funding to support our
operations, we would have to reduce or cease operations or attempt to sell all
or a part of our operations.

We anticipate that our existing cash and cash equivalents, together with the
net proceeds of this offering, will be sufficient to fund our currently planned
operations through at least December 31, 2001. However, this expectation is
based on our current operating plan, which could change as a result of many
factors, and we could require additional funding sooner than anticipated. Our
requirements for additional capital may be substantial and will depend on many
factors, some of which are beyond our control, including:

 .payments received or made under possible future strategic partner agreements;

 .market acceptance of our products;

 .continued progress of our research and development of our products;

 .the cost of protection of patent and other intellectual property rights; or

 .further development of production, marketing and sales capabilities.

We have no credit facility or other committed sources of capital. To the extent
capital resources are insufficient to meet future capital requirements, we will
have to raise additional funds to continue the development of our technologies.
There can be no assurance that funds will be available on favorable terms if at
all. To the extent that additional capital is raised through the sale of equity
or convertible debt securities, the issuance of those securities could result
in dilution to our stockholders. Moreover, incurring debt financing could
result in a substantial portion of our operating cash flow being dedicated to
the payment of principal and interest on such indebtedness, could render us
more vulnerable to competitive pressures and economic downturns and could
impose restrictions on our operations. If adequate funds are not available, we
may be required to curtail operations significantly or to obtain funds through
entering into collaboration agreements on unattractive terms.

Because it is unlikely that we will ever pay dividends, you will only be able
to benefit from holding our stock if the stock price appreciates.

We have never paid cash dividends on our capital stock and do not anticipate
paying any cash dividends in the foreseeable future.

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

                                                                              17
<PAGE>

Risk factors

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


Anti-takeover provisions in our charter and bylaws and Delaware law could make
a third-party acquisition of us difficult.

Our certificate of incorporation and bylaws contain provisions that could make
it more difficult for a third party to acquire us, even if doing so would be
beneficial to our stockholders. These provisions could limit the price that
investors might be willing to pay in the future for shares of our common stock.
We are also subject to certain provisions of Delaware law that could delay,
deter or prevent a change in control of us. See "Description of securities --
Anti-takeover effects of provisions of the certificate of incorporation, bylaws
and Delaware law."

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18
<PAGE>


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

Forward-looking information

Some of the statements under "Prospectus summary," "Risk factors,"
"Management's discussion and analysis of financial condition and results of
operations," "Business" and elsewhere in this prospectus constitute forward-
looking statements. These statements relate to future events or our future
financial performance and involve known and unknown risks, uncertainties and
other factors that may cause our or our industry's actual results, levels of
activity, performance or achievements to be materially different from those
expressed or implied by any forward-looking statements. Some of these factors
are listed under "Risk factors" and elsewhere in this prospectus. In some
cases, you can identify forward-looking statements by terminology such as
"may," "will," "should," "expects," "plans," "anticipates," "intends,"
"believes," "estimates," "predicts," "potential" or "continue" or the negative
of these terms or other comparable terminology. These statements are only
predictions. Actual events or results may differ materially.

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                                                                              19
<PAGE>


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

Use of proceeds

We estimate that the net proceeds from the sale of the shares of common stock
we are offering will be approximately $74.6 million at an assumed initial
public offering price of $18.00 per share after deducting the estimated
underwriting discounts and commissions and estimated offering expenses. If the
underwriters' over-allotment option is exercised in full, we estimate that the
net proceeds will be approximately $85.9 million.

We currently intend to use the net proceeds to fund our operations, including
continued development and manufacturing of existing products as well as
research and development of additional products. In addition, we also intend to
use a portion of the net proceeds to hire additional personnel and expand our
facilities to be able to meet the growing needs of our business. Although we
have no current plans, agreements or commitments with respect to any
acquisition, we may, if the opportunity arises, use an unspecified portion of
the net proceeds to acquire or invest in products, technologies or companies.
We intend to use the balance of the net proceeds for general corporate
purposes, including working capital. Our management may spend the proceeds from
this offering in ways which the stockholders may not deem desirable.

The timing and amount of our actual expenditures will be based on many factors,
including cash flows from operations and the growth of our business.

Until we use the net proceeds of this offering for the above purposes, we
intend to invest the funds in short-term, investment grade, interest-bearing
securities. We cannot predict whether the proceeds invested will yield a
favorable return.

Dividend policy

We have never declared or paid any cash dividends on our capital stock. We
anticipate that we will retain any earnings to support operations and to
finance the growth and development of our business. Therefore, we do not expect
to pay cash dividends in the foreseeable future. Any future determination
relating to our dividend policy will be made at the discretion of our board of
directors and will depend on a number of factors, including future earnings,
capital requirements, financial conditions and future prospects and other
factors the board of directors may deem relevant.

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20
<PAGE>


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

Capitalization

The following table sets forth our capitalization as of December 31, 1999:

 .on an actual basis;

 .on a pro forma basis to give effect to the conversion of 841,359 shares of our
 preferred stock outstanding as of the date this prospectus into 8,768,592
 shares of common stock upon the closing of this offering; and

 .on a pro forma as adjusted basis to give effect to the conversion of our
 preferred stock into common stock and the receipt of the estimated net
 proceeds from the sale of 4,500,000 shares of common stock offered by this
 prospectus at an assumed initial public offering price of $18.00 per share.

<TABLE>
<CAPTION>
                                                              Pro    Pro Forma
                                                  Actual    Forma  as adjusted
- -------------------------------------------------------------------------------
                                                 (in thousands, except share
                                                          amounts)
<S>                                              <C>      <C>      <C>
Preferred stock, par value $0.001;
 Authorized shares -- none actual, 5,000,000 pro
    forma and pro forma as adjusted
 Issued and outstanding shares -- none actual,
    pro forma and pro forma as adjusted.........    $ --     $ --         $ --
Convertible preferred stock, par value $2.00;
 Authorized shares -- 5,000,000 actual, pro
    forma and pro forma as adjusted
 Issued and outstanding shares -- 841,359
    actual, none pro forma and pro forma as
    adjusted....................................  28,946       --           --
Common stock, par value $0.001;
 Authorized shares -- 50,000,000 actual,
    200,000,000 pro forma and pro forma as
    adjusted
 Issued and outstanding shares -- 13,167,754
    actual, 21,936,346 pro forma and 26,436,346
    pro forma as adjusted.......................      13       22           26
Warrants to purchase 535,500 shares of common
   stock........................................     180      180          180
Additional paid-in capital......................   5,511   34,448      109,074
Deferred stock compensation.....................    (467)    (467)        (467)
Accumulated deficit............................. (22,988) (22,988)     (22,988)
                                                 -------  -------      -------
 Total stockholders' equity.....................  11,195   11,195       85,825
                                                 -------  -------      -------
 Total capitalization........................... $11,195  $11,195      $85,825
                                                 =======  =======      =======
</TABLE>

The table above does not include:

 .3,437,359 and 4,231,134 shares of common stock issuable upon exercise of
 options outstanding at a weighted average price of $3.06 and $6.25 per share
 at December 31, 1999 and March 21, 2000, respectively; and

 .2,587,500 additional shares of common stock available for future grant under
 our 2000 Long-Term Incentive Plan at March 21, 2000.

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                                                                              21
<PAGE>


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

Dilution

Our historical net tangible book value as of December 31, 1999 was
approximately $11.2 million, or $0.85 per share, based on the number of common
shares outstanding as of December 31, 1999. Historical net tangible book value
per share is equal to the amount of our total tangible assets less total
liabilities, divided by the number of shares of common stock outstanding as of
December 31, 1999.

Our pro forma net tangible book value as of December 31, 1999 was approximately
$11.2 million, or $0.51 per share, based on the pro forma number of shares
outstanding as of December 31, 1999 of 21,936,346, calculated after giving
effect to the automatic conversion of 841,359 shares of our preferred stock
outstanding as of December 31, 1999 into 8,768,592 shares of our common stock.

Dilution in pro forma net tangible book value per share represents the
difference between the amount per share paid by purchasers of shares of our
common stock in this offering and the net tangible book value per share of our
common stock immediately afterwards, after giving effect to the sale of
4,500,000 shares in this offering. This represents an immediate increase in pro
forma net tangible book value of $2.74 per share to existing stockholders and
an immediate dilution in pro forma net tangible book value of $14.75 per share
to new investors. The following table illustrates this per share dilution:

<TABLE>
<S>                                                               <C>    <C>
Assumed initial public offering price per share..................        $18.00
 Historical net tangible book value per share as of December 31,
    1999......................................................... $0.85
 Decrease attributable to conversion of preferred stock.......... (0.34)
                                                                  -----
 Pro forma net tangible book value per share as of December 31,
    1999.........................................................  0.51
 Increase attributable to the offering...........................  2.74
                                                                  -----
Net tangible book value per share after the offering.............          3.25
                                                                         ------
Dilution per share to new investors..............................        $14.75
                                                                         ======
</TABLE>

The following table summarizes, on a pro forma basis as of December 31, 1999,
after giving effect to this offering, the total number of shares of common
stock purchased from us and the total consideration and the average price per
share paid by existing stockholders and by new investors:

<TABLE>
<CAPTION>
                          Shares purchased   Total consideration   Average price
                             Number Percent        Amount Percent      per share
- --------------------------------------------------------------------------------
<S>                      <C>        <C>      <C>          <C>      <C>
Existing stockholders..  21,936,346     83%  $ 30,562,740     27%         $ 1.39
New investors..........   4,500,000     17%    81,000,000     73%         $18.00
                         ----------     ---  ------------     ---
Total..................  26,436,346     100% $111,562,740     100%
                         ==========     ===  ============     ===
</TABLE>

The tables and calculations above assume no exercise of the outstanding options
or warrants described below:

 .3,437,359 and 4,231,134 shares issuable upon the exercise of options
 outstanding at a weighted average exercise price of $3.06 and $6.25 per share
 at December 31, 1999 and March 21, 2000, respectively;

 .535,500 shares issuable upon the exercise of warrants outstanding at a
 weighted average exercise price of $1.96 per share at December 31, 1999 and
 March 21, 2000; and

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

22
<PAGE>

Dilution

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

 .2,587,500 additional shares available for future grant under our 2000 Long-
 Term Incentive Plan at March 21, 2000.

To the extent that these options or warrants are exercised, there will be
further dilution to new investors. See "Management -- Employee benefit plans"
for further information regarding our stock option plan and stock purchase
plan.

If the underwriters exercise their over-allotment option in full, the following
will occur:

 .the percentage of shares of our common stock held by existing stockholders
 will decrease to approximately 81% of the total number of shares of our common
 stock outstanding after this offering;

 .the number of shares of our common stock held by new public investors will
 increase to 5,175,000, or approximately 19% of the total number of shares of
 our common stock outstanding after this offering; and

 .our pro forma net tangible book value will increase to $3.58 per share to
 existing stockholders and our pro forma net tangible book value will be
 diluted by $14.42 per share to new investors.

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                                                                              23
<PAGE>


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

Selected financial data

The following selected financial data should be read in conjunction with the
financial statements and the notes to such statements and "Management's
discussion and analysis of financial condition and results of operations"
included elsewhere in this prospectus. The statement of operations data for the
years ended December 31, 1997, 1998 and 1999, and the balance sheet data as of
December 31, 1998 and 1999, are derived from our financial statements which
have been audited by Ernst & Young LLP, independent auditors, and are included
elsewhere in this prospectus. The statement of operations data for the period
from May 24, 1995 (inception) to December 31, 1995 and for the year ended
December 31, 1996 and the balance sheet data as of December 31, 1995, 1996 and
1997 are derived from audited financial statements not included in this
prospectus. Historical results are not necessarily indicative of the results to
be expected in the future.

The pro forma net loss per share and shares used in computing pro forma net
loss per share are calculated as if all of our convertible preferred stock was
converted into shares of our common stock on the date of their issuance.

<TABLE>
<CAPTION>
                              PERIOD FROM
                             MAY 24, 1995
                           (INCEPTION) TO
                             DECEMBER 31,      YEAR ENDED DECEMBER 31,
                                     1995     1996     1997     1998      1999
STATEMENT OF OPERATIONS
DATA                            (In thousands, except per share data)
- -------------------------------------------------------------------------------
<S>                        <C>             <C>      <C>      <C>      <C>
Revenue:
 Product ................             $--      $--      $99     $386    $2,606
 Grant ..................              --       --       --       --       506
                                   ------  -------  -------  -------  --------
  Total revenue..........              --       --       99      386     3,112
Costs of product
   revenue...............              --       --       10       88     1,172
                                   ------  -------  -------  -------  --------
Gross margin.............              --       --       89      298     1,940
Operating expenses:
 Research and
    development..........              58    1,036    1,594    3,611     6,188
 Selling, general and
    administrative.......             216      731    1,426    2,566     5,238
                                   ------  -------  -------  -------  --------
  Total operating
     expenses............             274    1,767    3,020    6,177    11,426
                                   ------  -------  -------  -------  --------
Loss from operations.....            (274)  (1,767)  (2,931)  (5,879)   (9,486)
Interest income..........               4        7      178      283       284
                                   ------  -------  -------  -------  --------
Net loss.................            (270)  (1,760)  (2,753)  (5,596)   (9,202)
Accretion of discount on
   convertible preferred
   stock.................             --       --       --       --     (3,406)
                                   ------  -------  -------  -------  --------
Net loss applicable to
   common stockholders...          $ (270) $(1,760) $(2,753) $(5,596) $(12,608)
                                   ======  =======  =======  =======  ========
Net loss per share, basic
   and diluted...........          $(0.06)  $(0.16)  $(0.21)  $(0.43)   $(0.96)
                                   ======  =======  =======  =======  ========
Shares used in computing
   net loss per share,
   basic and diluted.....           4,531   10,826   12,842   13,086    13,151
Pro forma net loss per
   share, basic and
   diluted...............                                               $(0.45)
                                                                      ========
Shares used in computing
   pro forma net loss per
   share, basic and
   diluted...............                                               20,529
</TABLE>

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

24
<PAGE>

Selected financial data

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


<TABLE>
<CAPTION>
                                                     As of December 31,
                                              1995  1996    1997   1998    1999
Balance sheet data                                     (In thousands)
- -------------------------------------------------------------------------------
<S>                                           <C>  <C>    <C>    <C>    <C>
Cash and cash equivalents.................... $229   $14  $2,821 $8,537  $4,083
Working capital (deficit)....................  138  (249)  2,761  8,391  10,426
Total assets.................................  286   154   3,119  9,590  12,566
Total stockholders' equity (deficit).........  196  (110)  2,964  9,190  11,195
</TABLE>

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

                                                                              25
<PAGE>


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

Management's discussion and analysis of financial condition and results of
operations

The following discussion of our financial condition and results of operations
should be read in conjunction with the financial statements and the notes to
those statements included elsewhere in this prospectus. This discussion may
contain forward-looking statements that involve risks and uncertainties. As a
result of many factors, such as those set forth under "Risk factors" and
elsewhere in this prospectus, our actual results may differ materially from
those anticipated in these forward-looking statements.

Since our inception, we have incurred significant losses and, as of December
31, 1999, we had an accumulated deficit of $22.9 million. We anticipate
incurring additional losses, which may increase, for the foreseeable future.
Prior to 1999, we were considered a development stage company.

We commenced marketing our first generation system, the Luminex R/O system, in
1997 and our second generation technology, the LabMAP system, in 1999. Revenue
on sales of our products is recognized when persuasive evidence of an agreement
exists, delivery has occurred, the fee is fixed and determinable and
collectibility is probable. We expect that each system will generate a
recurring revenue stream from the sale of consumable products. In accordance
with the terms of the grant, grant revenue is recorded as the research expenses
relating to the grant are incurred, provided that the amounts received are not
refundable if the research is not successful. In addition, we may generate
royalty revenue from some of our strategic partners as they sell products
incorporating our technology or provide services to third parties using our
technology.

Our expenses have consisted primarily of costs incurred in research and
development, manufacturing scale-up and business development and from general
and administrative costs associated with our operations. We expect our research
and development expenses to increase in the future as we continue to develop
our products. Also, our selling and marketing expenses will increase as we
commercialize our products, and general and administrative expenses will
increase as we expand our facilities and assume the obligations of a public
reporting company.

We have a limited history of operations. We anticipate that our quarterly
results of operations will fluctuate for the foreseeable future due to several
factors, including market evaluation and acceptance of current or new products,
which may result in a lengthy sales cycle, patent conflicts, the introduction
of new products by our competitors, the timing and extent of our research and
development efforts, and the timing of significant orders. Our limited
operating history makes accurate predictions of future operations difficult or
impossible.

Deferred stock compensation represents the difference between the deemed fair
value of our common stock and the exercise price of options at the date of
grant. We are amortizing these amounts ratably over the vesting periods. As a
result of stock options granted in 1999, we recorded $1.7 million in deferred
stock compensation of which $467,000 remained unamortized as of December 31,
1999. As a result of stock options granted in 2000, we anticipate recording an
additional $2.1 million in deferred stock compensation. The remaining deferred
stock compensation as of December 31, 1999 and the additional deferred stock
compensation recorded in 2000 will be amortized over the respective vesting
terms of the underlying options resulting in anticipated amortization of
approximately $1.3 million in 2000, $556,000 in 2001, $532,000 in 2002, and
$135,000 in 2003. The deferred stock compensation expense incurred as a result
of stock option grants to consultants is an estimate based on the fair market
value of our common stock. Because the actual expense is calculated based on
the fair market value on the vesting date, we may incur additional deferred
stock compensation expense if the price of our common stock on the vesting date
exceeds the fair market value amount used in estimating the expense.

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

26
<PAGE>

Management's discussion and analysis of financial condition and results of
operation

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


RESULTS OF OPERATIONS

Years ended December 31, 1999 and 1998

Revenue
Revenue increased to $3.1 million in 1999 from $386,000 in 1998. The increase
was primarily attributable to the sale of Luminex 100 systems, which were
introduced in the first quarter of 1999, and Luminex XY Platforms, which were
introduced in the fourth quarter of 1999. Revenue from the sale of microspheres
increased $314,000 in conjunction with sales of the Luminex 100 and the
development of additional applications. Offsetting this increase was a decrease
in sales of the Luminex R/O system of $221,000 in 1999, which is consistent
with the phase-out of the Luminex R/O system and the introduction of the
higher-priced Luminex 100.

Also included in 1999 revenue was $506,000 associated with a government grant
that commenced on January 1, 1999. The grant was suspended as of September 30,
1999 when our joint venture partner withdrew due to a change in its business
strategy. We are in the process of evaluating the work plan and budget and may
resume the project with a new partner. We had no grant revenue in 1998.

Cost of product revenue
Cost of product revenue increased to $1.2 million in 1999 from $88,000 in 1998.
The increase was primarily attributable to the increase in the number of units
of the Luminex 100 sold in 1999 and the higher per unit cost of the Luminex
100, relative to the Luminex R/O system.

Research and development expenses

Research and development expenses increased to $6.2 million in 1999 from $3.6
million in 1998. These expenses include salaries and related costs of research
and development personnel as well as the costs of consultants, parts and
supplies associated with research and development projects. The increase was
primarily attributable to an increase of $789,000 million in salaries and
related personnel costs from the addition of employees during the year as well
as additional costs to complete the development of the Luminex 100 system.
Also, included in 1999 were costs of $607,000 associated with a government
grant. The increase was also due to amortization of deferred stock compensation
of approximately $447,000 in 1999. The increase in amortization of deferred
stock compensation was primarily attributable to the issuance of stock options
to our consultants.

Selling, general and administrative expenses

Selling, general and administrative expenses increased to $5.2 million in 1999
from $2.6 million in 1998. These expenses consist primarily of salaries and
related costs for executive, sales and marketing, finance and other
administrative personnel, the costs of facilities, insurance, trade shows and
legal support as well as the amortization of deferred stock and stock
compensation. The increase was attributable to consulting and professional fees
primarily related to the filing of patent applications that were $244,000
higher than in 1998, a $662,000 increase in salary costs, a $262,000 increase
in facilities costs due to the leasing of additional manufacturing space early
in 1999 and amortization of deferred stock and stock compensation expense of
approximately $817,000. Deferred stock compensation represents the difference
between the deemed fair value of our common stock and the exercise price of
options at the date of grant. These amounts are being amortized ratably over
the vesting periods. The increase in amortization of deferred stock and stock
compensation expense was primarily attributable to the issuance of stock
options to our consultants.

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

                                                                              27
<PAGE>

Management's discussion and analysis of financial condition and results of
operation

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


Interest income
Interest income remained relatively unchanged between 1998 and 1999.

Income taxes
As of December 31, 1999, we had federal net operating loss carryforwards of
$17.1 million. As of December 31, 1999, we have recorded a full valuation
allowance for our existing net deferred tax assets due to uncertainties
regarding their realization. We also have federal research tax credit
carryforwards of $572,000. The federal net operating loss and credit
carryforwards begin to expire in 2010, if not utilized. Utilization of the
federal net operating losses and credit carryforwards will be limited by the
change of ownership provisions contained in Section 382 of the Internal Revenue
Code. The annual limitation will result in the expiration of no more than
$750,000 of net operating losses before utilization.

Years ended December 31, 1998 and 1997

Revenue
Revenue increased to $386,000 in 1998 from $99,000 in 1997. The increase was
primarily attributable to higher unit sales of Luminex R/O systems in 1998
compared with 1997.

Cost of product revenue
Cost of product revenue increased to $88,000 in 1998 from $10,000 in 1997. The
increase was primarily attributable to increased unit sales of Luminex R/O
systems in 1998 compared to 1997.

Research and development expenses
Research and development expenses increased to $3.6 million in 1998 from $1.6
million in 1997. The increase was primarily attributable to higher staffing
levels, consulting and professional fees and usage of parts and supplies for
development purposes.

Selling, general and administrative expenses
Selling, general and administrative expenses increased to $2.6 million in 1998
from $1.4 million in 1997 primarily attributable to an increase in facilities
costs, consulting and professional fees and depreciation and amortization.

Interest income
Interest income increased to $283,000 in 1998 from $178,000 in 1997. The
increase was attributable to the higher average cash and cash equivalent
balances resulting from the $11.3 million net proceeds from the sale of our
Series C preferred stock, in mid 1998.

LIQUIDITY AND CAPITAL RESOURCES

We have funded our operations principally with $30.6 million of private equity
financings, $28.9 million of which came from a series of five preferred stock
offerings over the period 1996 through 1999 as follows:

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

28
<PAGE>

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATION

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


PREFERRED STOCK TRANSACTIONS

<TABLE>
<CAPTION>
                                                                  NO. OF
                                                            YEAR  SHARES AMOUNT
                                                            (dollar amounts in
ISSUE                                                            millions)
- -------------------------------------------------------------------------------
<S>                                                         <C>  <C>     <C>
Preferred Stock, Series A.................................. 1996 457,250   $0.9
Preferred Stock, Series B.................................. 1997 150,000    6.0
Preferred Stock, Series C.................................. 1998 151,571   12.1
Preferred Stock, Series D.................................. 1999  57,538    6.9
Preferred Stock, Series E.................................. 1999  25,000    3.0
                                                                          -----
                                                                          $28.9
                                                                          =====
</TABLE>

Each share of Series A Preferred Stock is convertible into 2.04 shares of our
common stock. Each share of our Series B, C, D and E Preferred Stock is
convertible into 20.4 shares of our common stock.

At December 31, 1999, cash, cash equivalents and short-term investments totaled
$9.0 million compared to $8.5 million and $2.8 million at December 31, 1998 and
1997, respectively. Our cash reserves are held in a variety of short term,
interest-bearing instruments including high-grade corporate bonds, commercial
paper, US government backed securities and money market accounts.

Cash used in operations was $8.4 million for the year ended December 31, 1999
compared with $5.1 million and $2.9 million for the years ended December 31,
1998 and 1997, respectively. The net loss for 1999 of $9.2 million was
partially offset by non-cash charges for depreciation, amortization and stock
compensation of $1.7 million and an increase in deferred revenue of $646,000.
Other factors contributing to the increase in operating cash used were an
increase in accounts receivable of $1.2 million and inventory increases of
$616,000.

Our purchases of property and equipment increased to $1.1 million in 1999, from
$399,000 in 1998. The increase was related to machinery, equipment and computer
equipment purchased to meet our operating equipment requirements, to provide
computer equipment for our new employees and to upgrade our network to
accommodate the increased rate of activity.

We expect to have negative cash flow from operations through at least 2000. We
expect to incur increasing research and development expenses, including
expenses related to additions to personnel and production and commercialization
efforts. Our future capital requirements will depend on a number of factors,
including our success in developing markets for our products, payments received
or made under possible future strategic agreements, the availability of
government research grants, continued progress of our research and development
of potential products, the timing and outcome of regulatory approvals, the
costs involved in preparing, filing, prosecuting, maintaining, defending and
enforcing patent claims and other intellectual property rights, the need to
acquire licenses to new technology, the status of competitive products and the
availability of other financing. We believe our existing cash, cash equivalents
and short-term investments, together with the net proceeds of this offering,
will be sufficient to fund our operating expenses and capital equipment
requirements through at least December 31, 2001.


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

                                                                              29
<PAGE>

Management's discussion and analysis of financial condition and results of
operation

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

We have no credit facility or other committed sources of capital. To the extent
our capital resources are insufficient to meet future capital requirements, we
will need to raise additional capital or incur indebtedness to fund our
operations. There can be no assurance that additional debt or equity financing
will be available on acceptable terms, if at all. If adequate funds are not
available, we may be required to delay, reduce the scope of or eliminate our
research and development programs, reduce our commercialization efforts or
obtain funds through arrangements with collaborative partners or others that
may require us to relinquish rights to certain technologies or products that we
might otherwise seek to develop or commercialize.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our interest income is sensitive to changes in the general level of US interest
rates, particularly since the majority of our investments are in short-term
instruments. Due to the nature of our short-term investments, we have concluded
that there is no material market risk exposure.

Inflation

We do not believe that inflation has had a material adverse impact on our
business or operating results during the periods presented.

Recent accounting pronouncements

In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
Accounting for Derivative Instruments and Hedging Activities. SFAS No. 133 is
effective for fiscal years beginning after June 15, 2000. SFAS No. 133 requires
that all derivative instruments be recorded on the balance sheet at their fair
value. Changes in the fair value of derivatives are recorded each period in
current earnings or other comprehensive income. We do not expect that the
adoption of SFAS No. 133 will have a material impact on our financial
statements because we do not currently hold any derivative instruments.

On March 31, 1999, the FASB issued an exposure draft entitled "Accounting for
Certain Transactions Involving Stock Compensation," which is a proposed
interpretation of APB Opinion No. 25 which has an effective date for certain
transactions of December 15, 1998. However, the exposure draft has not been
finalized. Once finalized and issued, the current accounting practices for
transactions involving stock compensation may need to change and such changes
could effect our future earnings.

In December 1999, the Securities and Exchange Commission released Staff
Accounting Bulletin No. 101, Revenue Recognition in Financial Statements, which
provides guidance on the recognition, presentation and disclosure of revenue in
financial statements. The application of SAB No. 101 did not have a material
impact on our financial statements.

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

30
<PAGE>


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

Business

OVERVIEW
Luminex Corporation has developed, manufactures and markets a proprietary
technology that simplifies biological testing for the life sciences industry.
This industry depends on a broad range of tests, called bioassays, to discover
new drugs, identify new genes or simply monitor blood cholesterol levels. The
LabMAP system simultaneously performs up to 100 bioassays on a single drop of
fluid. We accomplish this with the Luminex 100, a compact instrument that reads
biological tests taking place on the surface of microscopic plastic beads
called microspheres. The Luminex 100 combines this miniaturized bioassay
capability with small lasers, digital signal processors and proprietary
software to create a system offering significant advantages in speed,
precision, flexibility and cost. We believe our LabMAP technology is broadly
applicable in the fields of drug discovery, clinical diagnostics, genetic
analysis and biomedical research.

We began marketing the current generation of LabMAP in 1999. As of February 29,
2000, 63 life sciences customers have purchased 114 LabMAP systems. Our
customers include Abbott Laboratories, Bio-Rad Laboratories, Inc., Centers for
Disease Control and Prevention, Eli Lilly and Company, GlaxoWellcome plc,
Laboratory Corporation of America, Lawrence Livermore National Laboratories,
Life Technologies, Inc., Mayo Clinic, National Institutes of Health and
SmithKline Beecham Corporation.

MARKET OPPORTUNITY

Background

The life sciences industry uses bioassays extensively to detect the presence of
certain biochemicals, proteins or genes in a sample. Drug discovery, genetic
analysis, pharmacogenomics, clinical diagnostics and general biomedical
research broadly use bioassays. For example, bioassays can be used to:

 .measure the attraction, or affinity, between a chemical compound and a disease
 target for drug discovery and development;

 .assist physicians in prescribing the appropriate drug therapy to match the
 patient's unique genetic makeup, a process known as pharmacogenomics;

 .detect genetic variations, such as single nucleotide polymorphisms or SNPs;
 and

 .measure the presence and quantity of biochemicals in blood to assist
 physicians in diagnosing, treating and monitoring disease conditions such as
 heart attack or diabetes.

Laboratories either develop bioassays internally to meet their specific needs
or purchase them in the form of an off-the-shelf test kit or customized
service. Industry reports estimate the global market for tools the drug
discovery and development, clinical diagnostics and biomedical research
industries use to develop and perform bioassays to have been approximately
$27.5 billion in 1998 and expect it to grow at an annual rate of 7.2%.

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

                                                                              31
<PAGE>

Business

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


Markets description

Drug discovery and development
The bioassays the pharmaceutical industry employs vary in design and complexity
throughout the drug discovery and development process. Simple bioassays screen
a pharmaceutical company's library of chemical compounds against disease
targets. Confirmatory testing and lead optimization use more complex bioassays.
Finally, predictive toxicity bioassays are used to test the safety of the
potential drug.

Industry reports estimate the global market for tools to develop and perform
bioassays for the drug discovery and development industry to have been
approximately $7.2 billion in 1998 and project continued growth at an annual
rate of 11%. There are a number of factors driving this growth, including:

 .Increased research and development spending. According to industry reports,
 pharmaceutical and biotechnology companies spent in excess of $48 billion
 worldwide in 1998 on drug discovery and development. These reports project
 spending to increase at an annual rate of 11%. This is the result of
 increasing pressure to expand the product pipeline, find new applications for
 existing or failed drugs and shorten the drug discovery process in order to
 maximize the benefits of the patent protection period. As a result, we believe
 the number of identified disease targets for drug discovery will rise.
 According to industry reports, each pharmaceutical and biotechnology company
 expects to screen, on average, 27 targets in 2001, up from 17 in 1999.

 .A shift in research and development focus from gene sequencing to determining
 the function of genes and their protein products, known as functional genomics
 and proteomics.  The Human Genomics Project, an international effort to
 provide the first complete DNA sequence of a human, as well as the activities
 of such companies as Celera Genomics Group and Incyte Pharmaceuticals, are
 providing large amounts of information concerning human genes. Pharmaceutical
 and biotechnology companies now focus a major part of their research and
 development efforts on identifying the role those genes serve in biological
 processes and how variations in gene sequences may result in a predisposition
 for a disease or an adverse reaction to a drug. These activities are referred
 to as functional genomics. Since proteins serve as the mechanism through which
 genes control cellular activities, the study of proteins, or proteomics, is
 expected to intensify. We expect this shift in focus to lead to a dramatic
 rise in the number of identified disease targets and related bioassays.

Clinical diagnostics
The clinical diagnostics market broadly uses bioassays. These bioassays are
commonly referred to as in vitro diagnostics, or IVD, and detect the presence
and quantity of certain substances in body fluids, such as whole blood, plasma,
serum, urine and saliva, as well as cells and tissues. Applications range from
the simple detection of illegal drugs in urine to the screening and diagnosis
of genetic diseases, infectious diseases and cancer. A number of different
clinical settings, including hospital laboratories, commercial laboratories and
physicians' offices/ambulatory care centers perform these applications. There
are more than 150,000 hospital, commercial clinical and physician office
laboratories registered with the Health Care Financing Administration (HCFA) in
the United States.

An industry report estimates the global market for IVD products to have been
approximately $18 billion in 1998 and to be growing at an annual rate of 5%. We
believe a number of industry trends exist that will drive this growth,
including:

 .An increase in disease targets from the success of drug discovery efforts. We
 believe the rise in research and development spending by pharmaceutical and
 biotechnology companies will lead to the

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

32
<PAGE>

Business

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

 identification of a greater number of disease targets. These targets may be
 assayed during drug discovery and later developed as IVD products for disease
 diagnosis and monitoring. For example, the HIV viral load bioassay originally
 used to evaluate potential drug candidates is now the primary tool for patient
 monitoring.

 .Evolution of pharmacogenomics. Many studies investigate genetic variation
 among individuals, including SNPs, and their linkage to disease. A consortium
 of pharmaceutical companies seeking to correlate the results of an
 individual's SNP profile with drug response funds these studies. In doing so,
 pharmaceutical companies are attempting to discover new drugs and revive such
 potential blockbuster drugs as Rezulin, an extremely powerful anti-diabetic
 with dangerous side effects in a small fraction of users. Pharmacogenomics
 allow a physician to tailor a diabetic patient's drug therapy after bioassay
 of his or her genetic make-up.

 .Consolidation among the clinical diagnostic companies. As a result of industry
 consolidation, clinical diagnostic companies have been re-engineering the
 laboratory in order to streamline processes, improve productivity and lower
 costs. Attempts to integrate the many instruments employed by these
 laboratories have been part of this process. We believe, however, that
 clinical laboratories will ultimately prefer a single instrument that can
 perform the required bioassays.

 .Evolution of disease-specific test panels. Traditionally, health care
 providers have focused on a single target of a particular disease. Rarely,
 though, are diseases confined to a single, isolated molecular abnormality. For
 example, the predictive value of a cholesterol test is increased significantly
 when the HDL and LDL levels are determined. More recently, physicians have
 added homocysteine and C-reactive protein levels to the risk profile for heart
 disease. We believe clinical laboratories will demand a system that can
 perform all of these tests simultaneously from a single sample in a simple,
 cost effective format.

Biomedical research
Biomedical research is focused on understanding biological processes at the
molecular level. Through an understanding of such processes, scientists can
better characterize disease, a critical first step in designing drug therapies.
The National Institutes of Health provides over $12 billion annually in funding
to more than 50,000 scientists. These scientists work in the laboratories of
universities and other not-for-profit research institutions. The pharmaceutical
and biotechnology industries also fund significant research.

According to industry reports, the global market for bioassays in biomedical
research is estimated to have been approximately $2.3 billion in 1998 and
growing at an annual rate of 13%. We believe there are a number of industry
trends that will drive this growth, including:

 .Increased research and development spending by pharmaceutical
 companies. Pharmaceutical companies have a long history of collaborating with
 academic institutions to study biological processes at the molecular and
 cellular level. As these collaborations increase and diversify in focus, we
 believe the number of bioassays performed will rise.

 .Increased demand for SNP studies. Academic and not-for-profit institutions
 have played a major role in studying SNPs in the population. The SNP
 consortium, a collaboration of academic, not-for-profit research institutions
 and pharmaceutical companies, has announced an effort to identify over 300,000
 SNPs, some of which may be correlated with disease. As a result, we anticipate
 that demand for SNP detection bioassays will increase.

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

                                                                              33
<PAGE>

Business

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


Current assay development technologies and their limitations

The differing bioassay needs of life sciences laboratories have led to the
development of specialized techniques and instrumentation. As a result, most of
these laboratories have become highly compartmentalized. For example, clinical
testing facilities are organized into functional groups, such as chemistry,
microbiology, immunology and infectious diseases. Similarly, pharmaceutical
companies organize their laboratories by disease target, such as cancer and
hypertension, as well as by the stages of the drug discovery process, from
initial bioassay development to toxicology. This has created inefficiencies in
laboratories since they must now purchase multiple instruments, often from
different vendors, to meet their testing needs. This limits the laboratories'
ability to standardize bioassay techniques, operator training and hardware
maintenance.

While advances in bioassay technologies have delivered new capabilities, most
remain highly specialized and reinforce the problems associated with
compartmentalization.

The table below briefly describes the key bioassay technologies in the life
sciences industry and what we consider to be their comparative advantages and
disadvantages.

<TABLE>
<CAPTION>
Key technologies         Description               Markets served Advantages             Disadvantages
- -----------------------------------------------------------------------------------------------------------------
<S>                      <C>                      <C>             <C>                    <C>
BioChips                 High-density arrays      Biomedical      .Performs multiple     .High equipment cost
                         of DNA fragments         research        tests on   a single    .High cost per test
                         attached to a flat                       platform               .Fixed
                         glass or silicon surface                 .High throughput       configuration/inflexible
                                                                                         .Limited format--can
                                                                                         only   perform genetic
                                                                                         bioassays
- -----------------------------------------------------------------------------------------------------------------
Clinical                 Automated test-tube      Clinical        .High throughput       .High equipment cost-
Immuno-analyzers         based platform           diagnostics     .Reproducible          .High cost per test
                                                                  .Performs large        .Requires large sample
                                                                  number of              volume
                                                                    individual tests     .High maintenance costs
                                                                                         .Limited format -- can
                                                                                         only   perform
                                                                                         immunologic   bioassays
- -----------------------------------------------------------------------------------------------------------------
Gels and Blots           Physical separation of   Clinical        .Low equipment cost    . Labor intensive
                         analytes for             diagnostics     .Performs multiple     .Low throughput
                         visualization            and biomedical  bioassays              .Cannot perform
                                                  research          simultaneously         enzymatic assays
- -----------------------------------------------------------------------------------------------------------------
Microarrays              Low-density arrays       Biomedical      .Performs multiple     . High equipment cost
                         of DNA fragments         research        bioassays              .Low throughput
                         attached to a flat                         simultaneously       .Limited format--can
                         glass or silicon surface                 .Flexible                only perform genetic
                                                                  configuration            bioassays
- -----------------------------------------------------------------------------------------------------------------
Microfluidics chips      Miniaturized liquid      Biomedical      .Low sample volume     .High cost per test
                         handling system          research        .Low reagent volume    .Fixed
                         on a chip                                .Performs multiple     configuration/inflexible
                                                                  tests
                                                                    simultaneously
- -----------------------------------------------------------------------------------------------------------------
Microtiter based assays  Plastic trays with       Drug discovery, .Ease of use           .Requires large sample
                         discrete wells in which  clinical        .High throughput       volume
                         assays are fixed         diagnostics and .Reproducible          .Fixed configuration
                                                  biomedical      .Broad formats         .High reagent costs
                                                  research                               .Single test per well
</TABLE>

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

34
<PAGE>

Business

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


THE LUMINEX SOLUTION

Our solution is to provide a single platform, the LabMAP technology, that can
perform a wide range of bioassays in a cost-effective manner. Many technologies
are available to perform bioassays in the niche markets that comprise the life
sciences industry, all of which are accurate, sensitive and reliable. Luminex
believes that the LabMAP system meets these requirements and is the only
commercially available technology that provides each of the following key
features:

Multi-analyte/multi-format
LabMAP technology is designed to simultaneously perform from one to 100
distinct bioassays on a single sample. Unlike existing technologies that are
capable of performing only one type of bioassay, LabMAP can perform a broad
range of enzymatic, genetic and immunologic tests on a single instrumentation
platform. For example, the system could perform 100 immunologic allergy tests
using a single blood sample, while the next bioassay tested by the instrument
could be a complex genetic SNP panel. Although some DNA microarray technologies
can test for thousands of analytes per sample, we believe that one hundred
tests per sample will serve a significant portion of the DNA testing market.

Flexibility/scalability
LabMAP technology allows flexibility in customizing test panels. These panels
can be modified to include new bioassays simply by adding additional
microsphere sets. It is also scalable, meaning that there is no change in the
manufacturing process or the required labor, whether producing one million or
just 10 microsphere-based tests. The system remains cost-effective for the
smallest and largest laboratories.

Throughput
Our technology's current ability to perform up to 100 tests on a single sample
permits efficient use for high throughput applications. Throughput can be
further enhanced using the Luminex XY Platform, which permits 9,600 unattended
tests to be performed in less than an hour. A high throughput version of the
Luminex 100 being developed, the Luminex HTS, can be interfaced with automated
liquid handling equipment offered by several manufacturers to perform over
15,000 bioassays per hour.

Ease of use
Most LabMAP bioassays are simple to perform. A test sample, such as a drop of
blood, is added to a reagent solution containing microspheres and then
analyzed. Our LabMAP technology incorporates proprietary software to automate
all aspects of data acquisition and analysis in real-time. Results are provided
without the need for sophisticated data interpretation and can be directly
downloaded into a user's laboratory information system. The Luminex XY Platform
further simplifies use by enabling walk-away capability through automated
sample handling.

Low cost
We have designed the LabMAP system to be relatively inexpensive to manufacture
and utilize. Because the Luminex 100 is manufactured using many off-the-shelf
electronic components commonly used in consumer electronics, our products have
a comparatively low acquisition cost. In addition, microsphere-based bioassays
are inexpensive compared to other technologies such as biochips.

STRATEGY

Our goal is to establish LabMAP technology as the industry standard for
performing bioassays. To achieve this goal, we have implemented the following
strategy:

Focus on large, fast-growing sectors -- We will continue to focus our
commercialization efforts on large and fast-growing sectors of the life
sciences industry. We have targeted major pharmaceutical companies,

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large clinical laboratories, in vitro diagnostic manufacturers and major
medical institutions for our principal marketing efforts. We believe these
customers provide the greatest opportunity for maximizing the use of LabMAP
technology and that early adoption by these industry leaders will promote wider
market acceptance.

Continue to develop strategic partnerships -- We intend to broaden and
accelerate market acceptance of LabMAP technology by continuing to enter into
development, marketing and distribution partnerships with those leaders in the
life sciences industry that we believe could convert core product lines to the
Luminex platform. They may also develop new applications that take advantage of
unique LabMAP capabilities. By leveraging our partners' strong market positions
and utilizing their distribution channels and marketing infrastructure, we
believe we can expand our installed base.

Provide an open platform -- The LabMAP system allows end users to configure
their own tests without complex and expensive equipment. This open platform
encourages the development of a wide range of bioassays and enables our
strategic partners to deliver a variety of applications to end-users. The value
of LabMAP technology to our customers increases with each new application.

Develop next generation products -- We are committed to expanding the LabMAP
product line. Our research and development group is pursuing a number of
projects, including expanding the number of tests that can be performed on a
given sample and increasing the LabMAP system's throughput. We are also
collaborating with leading industry participants and major medical institutions
to develop additional LabMAP products.

Allow easy technology access -- We do not impose access fees on users of our
technology. We believe maximum value is derived from the recurring revenue
stream generated by widespread and frequent use. This is encouraged by a
pricing structure that combines a low system acquisition cost with inexpensive
consumables.

OUR LABMAP TECHNOLOGY

Our LabMAP technology combines several proven technologies with advanced
digital signal processing and proprietary software. With our technology,
discrete bioassays are performed on the surface of color-coded microspheres.
These microspheres are read in a compact analyzer that utilizes lasers and
high-speed digital signal processing to simultaneously identify the bioassay
and measure its result.

Polystyrene microspheres, approximately the size of a biological cell, are a
fundamental component of LabMAP technology. We purchase raw, undyed
microspheres and, in a proprietary process, dye them in sets with varying
intensities of red and infrared fluorescent dyes to achieve up to 100 distinct
colors. The specific dye proportions permit each color-coded microsphere to be
readily identified based on its fluorescent signature. Our customers create
bioassays by attaching different biochemical reactants to each distinct
microsphere set. The microsphere sets can then be combined in test panels as
required by the user, with a current maximum of 100 tests per panel.

To conduct a bioassay, microspheres with attached biochemicals, or reagents,
are mixed with a test sample. This mixture is then passed through the Luminex
100 instrument. The microspheres travel single file in a fluid stream through
two laser beams. The first laser excites the internal dyes that are used to
identify the microsphere set. The second laser excites a third fluorescent dye
that is used to quantitate the result of the bioassay taking place on the
surface of each individual microsphere. Our proprietary optics, digital signal
processors and software record the fluorescent signature of each microsphere
and compare the

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results to the known identity of each color-coded microsphere set.
Simultaneously, the test is analyzed and the result displayed in real-time.

PRODUCTS

We generally sell our products as a system comprised of one or more instruments
that use LabMAP consumables.

Instruments

Luminex 100
The Luminex 100 is a compact analyzer that integrates fluidics, optics and
digital signal processing to perform up to 100 bioassays simultaneously with a
single drop of fluid. By combining small diode lasers with digital signal
processors and microcontrollers, the Luminex 100 performs rapid, multi-analyte
profiles under the control of a Windows-based personal computer. The Luminex
100 analyzer is sold with a personal computer, LabMAP software and a starter
supply of microspheres for bioassay development. From market introduction
through February 29, 2000, we had sold 114 systems.

Luminex XY Platform
We also offer the Luminex XY Platform, which complements the Luminex 100 by
automating the sequential positioning of each well of a microtiter plate. This
permits a total of up to 9,600 unattended tests per plate to be performed in
less than an hour. It is designed to connect to robotic systems that deliver
these plates to the Luminex 100, allowing integration into fully automated test
centers. From market introduction through February 29, 2000, we had sold 62
Luminex XY Platforms.

Consumables

We use polystyrene microspheres in our LabMAP technology that are approximately
5.6 microns in size. We dye them using our proprietary method in up to 100
distinctly colored microsphere sets. Each can carry the reagents of an
enzymatic, genetic or immunologic bioassay. Consumables also include sheath
fluid and other relevant spare parts.

RESEARCH AND DEVELOPMENT

Our research and development program is devoted to advancing the capabilities
of our LabMAP technology and expanding the number of its applications. For the
fiscal year ended December 31, 1999, expenses for our research and development
activities were $6.1 million as compared to $3.6 million for 1998 and $1.6
million for 1997. As of February 29, 2000, we had approximately 49 engineers,
scientists and technicians dedicated to research and development. In addition,
we are collaborating with academic institutions and other companies to increase
the breadth of LabMAP applications.

Our current projects include:

 .expanding our multiple testing capabilities This effort is primarily driven by
 the pharmaceutical industry's demand for advanced genetic testing. In order to
 expand the number of tests per sample to 1,000, a more complex instrument will
 be required incorporating three lasers instead of the two contained in the
 Luminex 100. In addition, a third dye must be incorporated into the
 microspheres for classification purposes.

 .developing a point-of-care version of LabMAP This version of the LabMAP system
 would be designed for the small clinic, ambulance and other non-laboratory
 environments where bringing

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 testing closer to the patient delivers significant medical benefits. For
 example, an ambulance-based instrument could evaluate the multiple indicators
 of heart attack and forward this information to the hospital prior to patient
 arrival.

 .developing a high throughput screening version of LabMAP The Luminex HTS is
 being developed to meet the ultra-high-throughput demands of some
 laboratories. This instrument is being designed to generate up to 400,000
 individual bioassay results per day and will readily interface with a number
 of existing liquid handling systems.

Our current research collaborations include:

 .major manufacturers of liquid handling robotic systems The goal of some
 laboratories in the pharmaceutical industry is to perform up to a million
 bioassays per day. We believe this could be achieved in a cost-effective
 manner by integrating existing high-throughput liquid handlers with three
 Luminex HTS systems. We are collaborating with major manufacturers of
 sophisticated liquid handling equipment to develop the interface with the
 Luminex HTS.

 .Abbott Laboratories Luminex is collaborating with Abbott Laboratories to
 evaluate the effectiveness of the LabMAP system in "next generation" prostate
 specific antigen (PSA) tests.

SALES AND MARKETING

Our sales and marketing strategy is designed to expand the installed base of
LabMAP systems and generate recurring, high-margin revenues from royalties on
bioassay kits and testing services that use our technology, as well as from the
sale of microspheres. The key elements of our strategy include:

 .a strategic partner program with leading life sciences companies to act as
 resellers of our products to facilitate rapid adoption;

 .a direct sales effort to complement the strategic partner program; and

 .an extensive customer service program.

Our marketing efforts are divided between identifying leading life sciences
companies and internally generating new leads. We intend to utilize outside
public relations and advertising firms to increase market awareness.

Strategic partner program

We intend to use strategic partners as our primary distribution channel in
order to achieve broad market acceptance of our LabMAP technology. We believe
our strategic partners will provide us with complementary capabilities in
product development, regulatory expertise and sales and marketing. We intend to
target leading life sciences companies with established bioassays that we
believe could be converted onto our LabMAP platform. By leveraging our
partners' customer relationships and distribution channels, we believe that we
can achieve rapid market penetration without a large direct sales force. As a
result, we can utilize our internal resources for technology development and
customer support.

We have agreements with partners that contemplate the incorporation of LabMAP
technology in their application-specific bioassay kits and services. Our
partners sell these kits to medical laboratories, hospitals and other end-users
that use standardized sample analysis and screening products and services. Our
strategic partners also use our technology in performing services for third
parties. Under

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these agreements, we have agreed to supply our partners with Luminex 100
systems and microspheres in amounts and at prices that are determined by mutual
agreement. While our strategic partners are not required to purchase any
minimum number of our systems or microspheres, the agreements obligate them to
pay us royalties based on revenues generated by kits and services using our
technology. These agreements also include cross indemnities by our strategic
partners and us for infringement of third party intellectual property rights
and other specified costs and liabilities.

Pursuant to a Development and Supply Agreement dated March 19, 1999, as
amended, Bio-Rad Laboratories, Inc. has agreed for a term of seven years to
develop and distribute bioassay kits incorporating our LabMAP technology and
distribute Luminex 100 systems. Although we agree upon a rolling six month
forecast of delivery requirements of Luminex 100 systems and microspheres each
month, the agreement does not obligate Bio-Rad to purchase any minimum
quantities. These forecasts constitute good faith estimates of Bio-Rad's
requirements and only the first 90 days of each forecast are binding upon the
parties. Sales to Bio-Rad accounted for approximately 10%, or $311,000, of our
total net revenue in 1999.

Direct sales

Direct sales are supported by a team of employee scientists with expertise in
the pharmaceutical industry, clinical diagnostics and biomedical research. We
intend to expand our direct and field sales staff in selected geographic
locations as required by market demand.

Customer service

Customer service supports users through a comprehensive training program and a
toll-free customer support hotline. If a system requires an upgrade or on-site
repair, customer service will dispatch one of our field service technicians.
Our customer service team assists our strategic partners with the development
of their bioassays. This value-added service is designed to facilitate and
expedite the development of applications based on the LabMAP technology.

CUSTOMERS

Our customers consist of a broad range of participants in the life sciences
industry. As of February 29, 2000, our customers included the following:

<TABLE>
<CAPTION>
 Customer                          Market                    Application
- --------------------------------------------------------------------------------------
 <C>                               <S>                       <C>
 Bio-Rad Laboratories, Inc.        In vitro diagnostics,     Kits
                                   biomedical
                                   research and drug
                                   discovery

 Eli Lilly & Company               Drug discovery            Protein analysis

 GlaxoWellcome plc                 Drug discovery            SNP detection

 Laboratory Corporation of America Commercial clinical       Clinical testing
                                   laboratory

 Life Technologies, Inc.           Biomedical research and   Kits
                                   drug discovery

 Novartis Pharma AG                Drug discovery            Genetic testing
 RW Johnson/Pharmaceutical         Drug discovery            High throughput screening
 Research Institute

 SmithKline Beecham Corporation    Drug discovery            Protein analysis
</TABLE>

In 1999, Bio-Rad Laboratories, Inc. accounted for approximately 10% of our
total net revenue. No other customer accounted for more than 10% of our
revenues in 1999.

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MANUFACTURING OPERATIONS

Luminex 100

The basic components of the Luminex 100 are assembled by Sanmina Corporation,
an ISO 9002 contract manufacturer, pursuant to the terms and conditions of an
Agreement for Electronic Manufacturing Services effective January 1, 2000. This
agreement, which has a four year term that is automatically renewable for
additional one year terms, requires us to provide three and nine month rolling
forecasts of our manufacturing needs. Based on these forecasts, Sanmina
purchases the required system components and parts for the Luminex 100 from an
approved supplier list. We may terminate this agreement upon 120 days prior
written notice. Upon 30 days prior written notice, either party may terminate
upon the other's material breach or insolvency. We believe that, if necessary,
we could enter into an arrangement with an alternative contract manufacturer on
terms and conditions comparable to those we have with Sanmina. We cannot,
however, be certain of this. Once Sanmina has completed its portion of the
assembly process, it ships the system to our facility in Austin, Texas, where
our employees install and align the optical/laser assembly. At this point, a
personal computer with our proprietary software is added and each unit is run
through a quality control protocol.

Parts and component assemblies that comprise the Luminex 100 are obtained from
a number of sources. We intend to develop multiple sources for as many of the
component parts and assemblies as possible.

XY Platform

We purchase the principal components of the XY Platform from several
manufacturers. Final assembly and quality control occurs at our facility in
Austin, Texas.

Microspheres

We buy generic, undyed polystyrene microspheres from any one of three
suppliers. We then dye the microspheres using a proprietary method in our
manufacturing facility in large lots with ten intensities each of red and
infrared dyes to produce 100 distinctly colored microsphere sets. The dyed
microspheres are then repackaged for sale.

INTELLECTUAL PROPERTY

To establish and protect our proprietary technologies and products, we rely on
a combination of patent, copyright, trademark and trade secrets laws, as well
as confidentiality provisions in our contracts.

We have implemented an aggressive patent strategy designed to maximize our
intellectual property rights. We are pursuing patent coverage in the United
States and those foreign countries which correspond to the majority of our
anticipated customer base. We currently own two issued patents in the United
States and have received notices of allowances for two additional patent
applications. In addition, our patent portfolio includes pending patent
applications in the United States and corresponding international and foreign
filings in major industrial nations. One of our patents provides protection for
systems and technology that allows "real time" techniques for the detection and
quantification of many analytes from a single sample. As a result of a
procedural omission, we are unable to obtain comparable patent protection in
Japan.

The issued patents and allowed or pending patent applications claim proprietary
methods for the detection and quantification of analytes from a single sample
in a "real time" format as well as specific aspects and applications of the
LabMAP technology to molecular research.

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Generally, United States patents issued from applications filed on or after
June 8, 1995 have a term of 20 years from the application filing date or
earlier claimed priority. Patents in most other countries have a term of 20
years from the date of filing the patent application. All of our patent
applications, including the applications from which both of our issued patents
were derived, were filed after June 8, 1995. Because the time from filing to
issuance of patent applications in the life sciences industry is often several
years, this process may result in a shortened period of patent protection,
which may adversely affect our ability to exclude competitors from our markets.
Our issued United States patents will expire in 2015. Our success depends to a
significant degree upon our ability to develop proprietary products and
technologies and to obtain patent coverage for the products and technologies.
We intend to continue to file patent applications covering any newly-developed
products and technologies.

Patents provide some degree of protection for our proprietary technology.
However, the pursuit and assertion of patent rights, particularly in areas like
medical device development, pharmaceuticals and biotechnology, involve complex
legal and factual determinations and, therefore, are characterized by some
uncertainty. In addition, the laws governing patentability and the scope of
patent coverage continue to evolve, particularly in life sciences. As a result,
we cannot assure you that patents will issue from any of our patent
applications or from applications licensed to us. The scope of any of our
issued patents may not be sufficiently broad to offer meaningful protection. In
addition, our issued patents or patents licensed to us may be successfully
challenged, invalidated, circumvented or rendered unenforceable so that our
patent rights might not create an effective competitive barrier. Moreover, the
laws of some foreign countries may not protect our proprietary rights to the
same extent as do the laws of the United States. There can be no assurance that
any patents issued to us or our strategic partners will provide a legal basis
for establishing an exclusive market for our products or provide us with any
competitive advantages or that the patents of others will not have an adverse
effect on our ability to do business or to continue to use our technologies
freely. In view of these factors, our intellectual property positions bear some
degree of uncertainty.

The source code for our proprietary software is protected both as a trade
secret and/or as a copyrighted work.

We also rely in part on trade secret protection of our intellectual property.
We attempt to protect our trade secrets by entering into confidentiality
agreements with third parties, employees and consultants. Our employees also
sign agreements requiring that they assign to us their interests in inventions
and original expressions and any corresponding patents and copyrights arising
from their work for us. However, it is possible that these agreements may be
breached, invalidated or rendered unenforceable and if so, there may not be an
adequate corrective remedy available. Despite the measures we have taken to
protect our intellectual property, we cannot assure you that parties to our
agreements will not breach the confidentiality provisions in our contracts or
infringe or misappropriate our patents, copyrights, trademarks, trade secrets
and other proprietary rights. In addition, we cannot assure you that third
parties will not independently discover or invent competing technologies or
reverse engineer our trade secrets, or other technology. Therefore, the
measures we are taking to protect our proprietary technology may not be
adequate.

Although we are not a party to any legal proceedings, in the future, third
parties may file claims asserting that our technologies or products infringe on
their intellectual property. We cannot predict whether third parties will
assert such claims against us or our licensees or against the licensors of
technology licensed to us, or whether those claims will harm our business. If
we are forced to defend against such claims, whether they are with or without
any merit, whether they are resolved in favor of or against us, our licensees
or our licensors, we may face costly litigation and diversion of management's
attention and resources. As a result of such disputes, we may have to develop
at a

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substantial cost non-infringing technology, or enter into licensing agreements.
These agreements, if necessary, may be unavailable on terms acceptable to us,
or at all, which could seriously harm our business or financial condition.

In particular, we are aware of a European patent granted to Dr. Ioannis
Tripatzis, which covers certain testing agents useful for the determination of
antigens and/or antibodies as well as for methods of their use. Dr. Tripatzis
has publicly stated his belief that his patent covers aspects of our bead
technology in Europe. Counterparts of Dr. Tripatzis' European patent exist in
Japan and Canada. While we believe that the overall impact, if any, of Dr.
Tripatzis' patent, which expires in 2004, is limited, we cannot assure you that
any disputes that may arise ultimately will be resolved in our favor or that
the cost of litigating or otherwise resolving any disputes will not materially
adversely affect us.

COMPETITION

Our LabMAP technology can perform many different kinds of tests in many
different fields, including pharmaceutical and biomedical research, clinical
laboratory testing and many other segments of the life sciences industry. For
this reason, the competition we will encounter will necessarily be fragmented
based on the market. There are competitors in every field. Our competition
includes companies marketing conventional testing products based on established
technologies as well as companies developing their own advanced testing
technologies. Most of our competitors are larger than we are and can commit
significantly greater resources to competitive efforts. We cannot assure you
that the LabMAP system will be widely adopted in one or more markets or that we
will be able to compete effectively.

The pharmaceutical industry is the single biggest market for the genomic and
high throughput screening applications of the LabMAP technology. In each
application, Luminex faces a different set of competitors. Genomic testing for
variability in DNA can also be performed by products available from Affymetrix
Inc., Aclara Biosciences, Inc., Clontech Laboratories, Inc., a wholly-owned
subsidiary of Becton Dickinson & Company, and Sequenom, Inc., among others. In
high throughput screening, LJL BioSystems Inc. and Aurora BioSciences
Corporation offer products competitive with ours.

The clinical laboratory market is dominated by several very large competitors.
These include Abbott Laboratories, Bayer Corporation, Bio-Rad, Dade Behring
Inc., a wholly-owned subsidiary of Aventis, and Roche Bioscience, among others.
None currently offer multi-analyte testing systems, but it should be presumed
that programs are underway within at least some of these companies to develop
this capability.

Competition within the biomedical research market is even more fragmented than
that within the pharmaceutical industry. There are hundreds of suppliers to
this market including Amersham Pharmacia Biotech, Molecular Devices
Corporation, PerkinElmer, Inc. and Stratagene Cloning Systems, Inc. Any company
in this field could be a potential competitor with us.

GOVERNMENT REGULATION

We are regulated by the Food and Drug Administration within the framework of
medical devices, pursuant to various statutes including the Federal Food, Drug
and Cosmetic Act as amended and supplemented by the Medical Device Amendments
of 1976, the Safe Medical Devices Act of 1990, the Medical Device Amendments of
1992 and the FDA Modernization Act of 1997. The FDA classifies medical devices
intended for human use into three classes, Class I, Class II and Class III. The
controls applied to the different classifications are those the FDA believes
are necessary to provide reasonable assurance that a device is safe and
effective. Class I devices are noncritical products that can be adequately
regulated by "general controls," including provisions related to labeling,
producer registration, defect notification, records and reports and CGMP
(Current Good Manufacturing

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Practices) requirements. CGMP requirements govern the methods used in, and the
facilities and controls used for, the design, manufacture, packaging and
servicing of all finished medical devices intended for human use. Class II
devices are products for which the general controls of Class I devices alone
are not sufficient to assure the safety and effectiveness of the device and
require special controls. The additional special controls for Class II devices
include performance standards, post-market surveillance patient registries and
the use of FDA guidelines. Standards may include both design and performance
requirements. Class III devices have the most restrictive controls and require
pre-market approval by the FDA. Class III devices include life-sustaining,
life-supporting or implantable devices. The FDA inspects medical device
manufacturers and distributors and has broad authority to order recalls of
medical devices, to seize noncomplying medical devices, to enjoin and/or impose
civil penalties on manufacturers and distributors marketing noncomplying
medical devices and to prosecute criminal violators.

Federal law requires individuals or companies manufacturing most medical
devices intended for human use to file a notice, which is known as a 510(k),
with the FDA at least 90 days before introducing the product into the
marketplace. The 510(k) notice must identify the type of classified device into
which the product falls, the class of that type and the specific marketed
product to which the product claims to be "substantially equivalent." In some
cases the notification must include data from human clinical studies in order
to establish "substantial equivalence." If the registrant states the device is
unclassified, but nonetheless claims substantial equivalence to a marketed
device or recognized diagnostic procedure, it must explain the basis for that
determination. The FDA must affirmatively agree with the claim of substantial
equivalence before the device may be marketed.

The hardware portion of the Luminex 100 is a Class I medical device of a
particular type, which is exempt from the 510(k) notice requirements. Depending
on their intended applications, some of our products and products based on our
technology expected to be produced by our strategic partners are subject to
approval or clearance by the FDA prior to marketing for commercial use.
Products using our technology for clinical diagnostic purposes will require
such approval or clearance. We will assist our strategic partners in filing
their own 510(k)s for their bioassays that will be run on our LabMAP
technology, including providing the verification and validation of our LabMAP
system.

If a product does not qualify for the 510(k) notice procedure (either because
it is not substantially equivalent to a legally marketed device or because it
is a Class III device), the FDA must approve a pre-market approval application
before marketing can begin. Obtaining approval can take several years.
Clearance pursuant to notification can be obtained in less time. In general,
clearance of a 510(k) notification for a device is obtained by the registrant
establishing that the new device is "substantially equivalent" to another
device of such class that is already on the market. This requires the new
device to have the same intended use as a legally marketed predicate device and
have the same technological characteristics as the predicate device. If the
technological characteristics are different, the new device can still be found
to be "substantially equivalent" if information submitted by the applicant
(including clinical data if requested) supports a finding that the new device
is as safe and effective as a legally marketed device and does not raise
questions of safety and efficacy that are different from the predicate device.
There can be no assurance that we will not be required to obtain 510(k)
clearance or pre-market approval prior to commercial distribution of future
products or future applications of current products.

We are registered with the FDA as a device manufacturer. We are subject to
periodic inspection by the FDA for compliance with the FDA's CGMP and other
regulations. These regulations require that we manufacture our products and
maintain our documents in a prescribed manner with respect to manufacturing,
testing and control activities. Further, we are required to comply with various
FDA requirements for labeling. The Medical Device Reporting regulation requires
that a company provide

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information to the FDA whenever there is evidence to reasonably suggest that
one of its devices may have caused or contributed to a death or serious injury,
or a device malfunction would be likely to cause or contribute to a death or
serious injury if the malfunction were to recur. In addition, the FDA prohibits
a company from marketing approved devices for unapproved indications. If the
FDA believes that a company is not in compliance with applicable regulations,
it can institute proceedings to detain or seize products, issue a recall,
impose operating restrictions, enjoin future violations and assess civil and
criminal penalties against the company, its officers or its employees and can
recommend criminal prosecution to the Department of Justice. Other regulatory
agencies may have similar powers. Our strategic partners are subject to the
same requirements and enforcement.

Medical device laws are also in effect in many countries outside of the United
States. These range from comprehensive device approval requirements for some or
all of our medical device products to simpler requests for product data or
certification. The number and scope of these requirements are increasing. In
addition to the requirements relating to medical devices, we will also have to
comply with FDA regulations on the performance of laser products because our
Luminex 100 utilizes lasers in order to identify the bioassays and measure
their result. These regulations are intended to ensure the safety of laser
products by establishing standards to prevent exposure to excess levels of
laser radiation.

Failure to comply with applicable federal, state and foreign medical device
laws and regulations would likely have a material adverse effect on the our
business. In addition, federal, state and foreign regulations regarding the
manufacture and sale of medical devices are subject to future changes. We
cannot predict what impact, if any, such changes might have on our business,
but such change could have a material impact.

We are subject to various federal, state and local laws and regulations
relating to the protection of the environment. In the course of our business,
we are involved in the handling, storage and disposal of certain chemicals. The
laws and regulations applicable to our operations include provisions that
regulate the discharge of materials into the environment. Usually these
environmental laws and regulations impose "strict liability," rendering a
person liable without regard to negligence or fault on the part of such person.
Such environmental laws and regulations may expose us to liability for the
conduct of, or conditions caused by, others, or for acts that were in
compliance with all applicable laws at the time the checks were performed. We
do not believe that we have been required to expend material amounts in
connection with our efforts to comply with environmental requirements or that
compliance with such requirements will have a material adverse effect upon our
capital expenditures, results of operations or competitive position. Because
the requirements imposed by such laws and regulations are frequently changed,
we are unable to predict the cost of compliance with such requirements in the
future, or the effect of such laws on our capital expenditures, results of
operations or competitive position.

EMPLOYEES

As of February 29, 2000, we had 87 employees. None of our employees are covered
by a collective bargaining agreement. We believe that our relations with our
employees are good.

FACILITIES

We occupy approximately 36,000 combined square feet of leased and sub-leased
office space and other facilities in Austin, Texas for our headquarters and as
the base for our marketing and product support

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operations, research and development and manufacturing activities. The monthly
rent on the combined space is approximately $35,000. Substantially all of our
space is leased through early 2002. We intend to use a portion of the proceeds
of this offering to expand our current facilities.

LEGAL PROCEEDINGS

As a result of a procedural omission, we are unable to pursue a patent in Japan
which corresponds to our issued US patent directed to our method of "real time"
detection and quantification of multiple analytes from a single sample. We have
filed a lawsuit alleging negligence on the part of our prior patent counsel in
this matter and seeking to recover the damages we believe will result from any
gaps in our patent protection in Japan as a result of this omission. At this
time, we cannot predict whether this lawsuit will be successful and, if so, the
amount of any damages we may recover.

From time to time, we may be involved in litigation that arises through the
normal course of business. As of the date of this prospectus, we are not a
party to any litigation we believe could reasonably be expected to have a
material adverse effect on our business or results of operations.

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

                                                                              45
<PAGE>


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


Management

EXECUTIVE OFFICERS AND DIRECTORS

Set forth below is the name, age, position and a brief account of the business
experience of each of our executive officers and directors.

<TABLE>
<CAPTION>
 Name                          Age Position
- -----------------------------------------------------------------------------
 <C>                           <C> <S>
 Mark B. Chandler, PhD (1)....  46 Chairman of the Board, President and Chief
                                   Executive Officer
 Michael L. Bengtson..........  42 Executive Vice President, General Counsel
                                   and Secretary
 Van S. Chandler..............  49 Vice President of Instruments
 Ralph L. McDade, PhD.........  45 Vice President of Scientific Affairs
 Michael D. Spain, MD.........  47 Vice President of Clinical Affairs
 James L. Persky..............  51 Vice President, Treasurer and Chief
                                   Financial Officer
 Randel S. Marfin.............  43 Vice President of Business Development
 G. Walter Loewenbaum (1).....  55 Director
 A. Sidney Alpert.............  61 Director
 Robert J. Cresci (2).........  56 Director
 Laurence E. Hirsch (1)(2)....  54 Director
 Jim D. Kever (2)(3)..........  47 Director
 Fred C. Goad, Jr. (3)........  59 Director
 John E. Koerner, III (2)(3)..  57 Director
 William L. Roper, MD, MPH....  51 Director
</TABLE>
- --------

(1) Member of the executive committee
(2) Member of the audit committee
(3) Member of the compensation and stock option committee

Mark B. Chandler, PhD Dr. Chandler founded our company with his brother Van S.
Chandler, in May 1995, and has served as Chairman of the Board and Chief
Executive Officer since that date and as President since June 1999. He also has
served as a member of the executive committee of our board of directors since
its formation in July 1997. In 1982, he founded Inland Laboratories, Inc.,
which provides plant and bacterial toxins to the medical research community. As
the President and CEO of Inland, Dr. Chandler received the KPMG Peat Marwick,
High Technology Entrepreneur of the Year award in 1987. He received his PhD in
Immunology from the University of Texas Southwestern Medical School in Dallas
in 1981.

Michael L. Bengtson Mr. Bengtson has agreed to join our company as Executive
Vice President, General Counsel and Secretary upon completion of this offering.
Since 1984, Mr. Bengtson has been an attorney practicing corporate and
securities law with the law firm of Thompson & Knight LLP and has been a
partner in that firm since 1990. Prior to attending law school, Mr. Bengtson
was a certified public accountant with KPMG LLP. Mr. Bengtson received a BS in
Accounting and Business Administration from the University of Kansas in 1980
and a JD from Arizona State University in 1984.

Van S. Chandler Mr. Chandler, our co-founder, has served as Vice President of
Instruments since January 1998. In addition, Mr. Chandler served as a director
from May 1995 to February 2000 and as an independent contractor from 1995 to
1998. Since 1995, he has led the design and development of the digital signal
processing hardware and data analysis software for the Luminex 100 and Luminex
R/O Systems. In 1990, Mr. Chandler founded Sigma Logic Corp., and while serving
as its President and

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

46
<PAGE>

Management

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

CEO from 1990 to 1995, he developed an array of law enforcement technologies,
including wireless police data networks and imaging systems for the FBI. Mr.
Chandler founded Concept Communications, Inc. and served as its President and
CEO from 1985 to 1990. He graduated from the University of Texas at Arlington
in 1972 with a BBA in Statistics.

Ralph L. McDade, PhD Dr. McDade has served as Vice President of Scientific
Affairs since June 1999. From January 1996 to June 1999 he served as Vice
President of Development. From 1988 until 1996, he served as Director of
Research and Development for Inland Laboratories. After post-doctoral training
at The University of Connecticut Health Center in Farmington, he held faculty
positions at The Rockefeller University in New York and at Louisiana State
University Medical Center in New Orleans. Dr. McDade received his PhD in
Microbiology from the University of Texas Southwestern Medical School in 1980.

Michael D. Spain, MD Dr. Spain has served as Vice President of Clinical Affairs
of Luminex since March 1997. From 1994 until joining us, he served as Medical
Director of Laboratory Corporation of America in San Antonio, Texas. From 1984
to 1994, he served as Medical Director of Quest Laboratory in Dallas (formerly
Damon Clinical Laboratory). Following a four year residency in pathology at
Baylor University Medical Center in Dallas, he became board certified in 1984.
Dr. Spain received his MD from the University of Texas Southwestern Medical
School in Dallas in 1980.

James L. Persky Mr. Persky joined our company in March 1998 and has served as
Vice President, Treasurer and Chief Financial Officer since that date. Prior to
joining us, he was Executive Vice President-Finance and Administration and
Chief Financial Officer for Southdown, Inc., a publicly-traded cement
manufacturing company where he served for 13 years. Mr. Persky also spent over
thirteen years in the oil and gas industry in various finance and accounting
positions. Mr. Persky received a BBA from the University of Texas in 1971 and
an MS in Accounting from the University of Houston in 1983. He has been a
Certified Public Accountant since 1979.

Randel S. Marfin Mr. Marfin has served as Vice President of Business
Development, since joining our company in June 1999 and has over thirteen years
of clinical laboratory management experience. Prior to joining us, he worked
for three years at SpectraCell Laboratories, Inc., most recently as Vice
President of Sales and Marketing where he was responsible for business
development, acquisitions, strategic planning and sales and marketing. From
1990 to 1998, he served as General Manager of Texas for both Damon Clinical
Laboratories and Nichols Institute. In addition, Mr. Marfin held sales
management and business development positions for Damon Clinical Laboratories
and MPC Labs. Mr. Marfin has a BS in Biochemistry and Biophysics from the
University of Houston and served in the United States Air Force.

G. Walter Loewenbaum Mr. Loewenbaum has served as a member of our board of
directors since May 1995 and served as Vice Chairman of the Board from April
1998 until January 2000. He also has served as a member of the executive
committee of our board of directors since its formation in July 1997. Since
April 1990, he has served as the President, Chairman and CEO of Loewenbaum &
Company Inc. He received a BA from the University of North Carolina.
Mr. Loewenbaum is also Chairman of 3D Systems Corporation.

A. Sidney Alpert Mr. Alpert has served as a member of our board of directors
since December 1996 and as a member of the audit committee of our board of
directors since its formation in July 1997. Since June 1999, he has served as a
legal consultant to Luminex as well as 3D Systems. From January 1996 to June
1999, Mr. Alpert served as Vice President and General Counsel of 3D Systems
where he

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

                                                                              47
<PAGE>

Management

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

was also a director from August 1993 to May 1996. From January 1994 through
December 1995, he was an independent intellectual property consultant. From
late 1988 through December 1993, Mr. Alpert served as Chairman of the Board and
CEO of Competitive Technologies Inc.

Robert J. Cresci Mr. Cresci has served as a member of our board of directors
since December 1996 and has served as a member of the compensation and stock
option committee of our board of directors since its formation in July 1997. He
has been a Managing Director of Pecks Management Partners Ltd., an investment
management firm, since September 1990. Mr. Cresci currently serves on the
boards of Sepracor Inc., Arcadia Financial Ltd., Aviva Petroleum Inc., Quest
Education Corporation, Castle Dental Centers, Inc., Candlewood Hotel Co., Inc.,
SeraCare, Inc., E-Stamp Corporation and Film Roman, Inc.

Laurence E. Hirsch Mr. Hirsch has served as a member of our board of directors
since December 1996 and has served as a member of the executive committee of
our board of directors since its formation in July 1997. He is currently the
Chairman of the Board and CEO of Centex Corporation. He has served in these
positions since July 1991 and July 1988, respectively. He joined Centex as
President and Chief Operating Officer and became a member of their board of
directors in 1985. Mr. Hirsch received a BS in Economics from the Wharton
School at the University of Pennsylvania and a JD from the Villanova University
School of Law. He also serves as a director of Centex Construction Products,
Inc. and A.H. Belo Corporation.

Jim D. Kever Mr. Kever has served as a member of our board of directors since
December 1996 and has served as a member of the audit committee of our board of
directors since its formation in July 1997. He is currently the President and
CEO of Envoy Corporation, a wholly-owned subsidiary of Quintiles Corporation.
Mr. Kever joined Envoy Corporation as Treasurer and General Counsel in October
1981. Prior to joining Envoy (and its predecessor) in 1981, Mr. Kever was
employed by Datanet, a pharmaceutical software company. Mr. Kever received a BS
in business and administration from the University of Arkansas in 1974 and JD
from Vanderbilt University School of Law in 1977.

Fred C. Goad, Jr. Mr. Goad has served as a member of our board of directors
since September 1997 and has served as a member of the compensation and stock
option committee of our board of directors since April 1998. He is Senior
Advisor to the Office of the President of Envoy Corporation. He became a
director and President of Envoy Corporation in August 1984 and served as
Chairman of the Board of Directors and co-CEO of Envoy from August 1995 to
March 1999. Mr. Goad spent ten years with IBM, where he contributed in both
staff and line responsibilities. Mr. Goad also serves on the Board of Directors
for Performance Food Group Company and Quintiles Corporation.

John E. Koerner, III Mr. Koerner has served as a member of our board of
directors since September 1997 and has served as a member of the compensation
and stock option committee of our board of directors since April 1998. He has
been President of Koerner Capital Corporation since 1995 and also serves as a
director on the board of Legg Mason, Inc. He earned a BS in 1965, a JD in 1969
and an MBA in 1971, all from Tulane University.

William L. Roper, MD, MPH Dr. Roper has served as a member of our board of
directors since March 2000. Since July 1997, he has served as the dean of the
School of Public Health at the University of North Carolina at Chapel Hill,
professor of health policy and administration in the School of Public Health
and professor of pediatrics in the School of Medicine. From August 1993 to July
1997, Dr. Roper served in a variety of capacities with the Prudential Insurance
Company of America, including Senior Vice President for Medical Management.
Prior to joining Prudential, Dr. Roper was director of the Centers for Disease
Control and Prevention, served on the senior White House staff and was
administrator of the Health Care Financing Administration. He received his MD
from the University of Alabama School of Medicine and his MPH from the
University of Alabama at Birmingham School of Public Health.

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

48
<PAGE>

Management

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


BOARD COMPOSITION

We currently have nine authorized directors. In accordance with the terms of
our certificate of incorporation, the terms of office of the directors are
divided into three classes:

 .Class I, whose term will expire at the annual meeting of stockholders to be
 held in 2001;

 .Class II, whose term will expire at the annual meeting of stockholders to be
 held in 2002; and

 .Class III, whose term will expire at the annual meeting of stockholders to be
 held in 2003.

The Class I directors are A. Sidney Alpert, William L. Roper and Robert J.
Cresci, the Class II directors are Laurence E. Hirsch, Jim D. Kever and Fred C.
Goad, Jr., and the Class III directors are Mark B. Chandler, G. Walter
Loewenbaum and John E. Koerner, III. At each annual meeting of stockholders
after the initial classification or special meeting in lieu thereof, the
successors to directors whose terms will then expire will be elected to serve
from the time of election and qualification until the third annual meeting
following election or special meeting held in lieu thereof. The authorized
number of directors may be changed only by resolution of the board of directors
or a super-majority vote of the stockholders. Any additional directorships
resulting from an increase in the number of directors will be distributed among
the three classes so that, as nearly as possible, each class will consist of
one third of the directors. This classification of the board of directors may
have the effect of delaying or preventing changes in control or management of
Luminex.

BOARD COMMITTEES

The executive committee of the board of directors was established in July 1997.
The members of our executive committee are Mark B. Chandler, G. Walter
Loewenbaum and Laurence E. Hirsch. The executive committee has broad powers as
delegated by the board of directors.

The audit committee of the board of directors was established in July 1997 and
reviews, acts on and reports to the board of directors on various auditing and
accounting matters, including the recommendation of our independent auditors,
the scope of the annual audits, fees to be paid to the independent auditors,
the performance of our independent auditors and our accounting practices. The
members of our audit committee are Robert J. Cresci, Laurence E. Hirsch, Jim D.
Kever and John E. Koerner, III, each of whom is an independent director.

The compensation and stock option committee of the board of directors was
established in July 1997 and determines the salaries and benefits for our
employees, consultants, directors and other individuals compensated by us. The
compensation and stock option committee also administers our stock option
plans, including determining the stock option grants for our employees,
consultants, directors and other individuals. The members of the compensation
and stock option committee are Jim D. Kever, Fred C. Goad, Jr. and John E.
Koerner, III.

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

                                                                              49
<PAGE>

Management

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


DIRECTOR COMPENSATION

We reimburse our non-employee directors for expenses incurred in connection
with attending board and committee meetings but do not compensate them for
their services as board or committee members. We have in the past granted non-
employee directors options to purchase our common stock pursuant to the terms
of our 1996 Stock Option Plan, and our board continues to have discretion to
grant options to new non-employee directors. We anticipate that we will
continue to grant options from time to time under the 2000 Long-Term Incentive
Plan to our non-employee directors. In 1997, seven nonemployee directors were
granted fully vested options to purchase 10,200 shares of common stock and one
additional director was granted fully vested options to purchase 61,200 shares
of common stock. In 1999, six non-employee directors were granted a fully
vested option to purchase 30,600 shares of common stock.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

Our compensation and stock option committee currently consists of Messrs.
Kever, Goad and Koerner. No member of the compensation and stock option
committee has been an officer or employee of ours at any time. None of our
executive officers serves as a member of the board of directors or compensation
committee of any other company that has one or more executive officers serving
as a member of our board of directors or compensation and stock option
committee. Prior to the formation of the compensation and stock option
committee in July 1997, the board of directors as a whole made decisions
relating to compensation of our executive officers.

LIMITATION OF LIABILITY AND INDEMNIFICATION OF OFFICERS AND DIRECTORS

Our certificate of incorporation and our bylaws provide that our directors and
officers shall be indemnified by us to the fullest extent authorized by
Delaware law, as it now exists or may in the future be amended, against all
expenses and liabilities reasonably incurred in connection with their service
for or on our behalf. In addition, the certificate of incorporation provides
that our directors will not be personally liable for monetary damages to us for
breaches of their fiduciary duty as directors, unless they violated their duty
of loyalty to us or our stockholders, acted in bad faith, knowingly or
intentionally violated the law, authorized illegal dividends or redemptions or
derived an improper personal benefit from their action as directors. We have
obtained insurance which insures our directors and officers against specified
losses and which insures us against specific obligations to indemnify our
directors and officers.

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

50
<PAGE>

Management

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


EXECUTIVE COMPENSATION

Summary of cash and other compensation

The following table shows all compensation received during the year ended
December 31, 1999 by our Chief Executive Officer and our four other highest-
paid executive officers, collectively referred to as the Named Executive
Officers. Other compensaton consists of matching payments made under our
Savings Incentive Match Plan for Employees under Section 408(p) of the Internal
Revenue Code.

Summary compensation
<TABLE>
- --------------------------------------------------------------------------------
<CAPTION>
                                 Annual            Long-term
                              compensation    compensation awards
                                                         Securities
                                            Other annual underlying        Other
Name and principal position    Salary Bonus compensation    options compensation
- --------------------------------------------------------------------------------
<S>                          <C>      <C>   <C>          <C>        <C>
Mark B. Chandler...........  $225,000  $ --         $ --    510,000         $ --
 Chairman and Chief
    Executive Officer
Van S. Chandler............   175,000    --           --    153,000        5,250
 Vice President of
    Instruments
Ralph L. McDade............   175,000    --           --         --        5,250
 Vice President of
    Scientific Affairs
Michael D. Spain...........   160,000    --           --     51,000        4,800
 Vice President of Clinical
    Affairs
James L. Persky............   150,000    --           --         --        4,500
 Vice President, Treasurer
    and Chief Financial
    Officer
</TABLE>

Options

The following table shows information regarding options granted to the
executive officers listed in the summary compensation table above during the
fiscal year ended December 31, 1999. We have not granted any stock appreciation
rights.

Each option represents the right to purchase one share of our common stock. The
options generally vest over three years. The exercise price for options granted
is equal to the fair market value of a share of common stock on the date of
grant. The fair market value of our common stock on a given date is the
conversion price for the convertible preferred stock sold in our most recent
issuance. For stock options granted in November and December 1999, in
accordance with applicable accounting standards, we have redetermined the fair
market value of our common stock based on the estimated initial public offering
price. As a result, we will record deferred stock compensation expense for such
options in an amount equal to the difference between the estimated fair market
value on the date of grant and the initial public offering price. See
"Management--Employee benefit plans" for more details regarding these options.
In the year ended December 31, 1999, we granted options to purchase an
aggregate of 1,666,884 shares of common stock to various officers, employees,
directors and consultants.

The potential realizable value at assumed annual rates of stock price
appreciation for the option term represents hypothetical gains that could be
achieved for the respective options if exercised at the end of the option term.
The 5% and 10% assumed annual rates of compounded stock price appreciation are
required by rules of the SEC and do not represent our estimate or projection of
our future common stock prices. These amounts represent assumed rates of
appreciation in the value of our common stock from the fair market value on the
date of grant. Actual gains, if any, on stock option exercises are dependent on
the future performance of our common stock and overall stock market conditions.
The amounts reflected in the table may not necessarily be achieved.

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

                                                                              51
<PAGE>

Management

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


Option grants in last fiscal year
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                    Individual grants
                                                                  Potential
                                                                 realizable
                                                              value at assumed
                                   % of                        annual rates of
                    Number of     total                        appreciation of
                   securities   options  Exercise                   stock
                   underlying   granted     price             price for option
                      options        to       per Expiration        term
Name                  granted employees     share       date       5%        10%
- --------------------------------------------------------------------------------
<S>                <C>        <C>        <C>      <C>        <C>      <C>
Mark B.
   Chandler......     510,000        40%    $3.92    5/20/04 $552,563 $1,221,020
Van S. Chandler..     153,000        12      3.92    5/20/04  165,769    366,306
Ralph L. McDade..          --        --        --         --       --         --
Michael D.
   Spain.........      51,000         4      3.92    5/20/04   55,256    122,102
James L. Persky..          --        --        --         --       --         --
</TABLE>

The following table shows information as of December 31, 1999 concerning the
number and value of unexercised options held by each of the executive officers
listed in the summary compensation table above. Options shown as exercisable in
the table below are immediately exercisable. However, we have rights to
repurchase shares of the common stock underlying some of these options upon
termination of the holder's employment with us. There was no public trading
market for the common stock as of December 31, 1999. Accordingly, the value of
unexercised in-the-money options listed below has been calculated on the basis
of the assumed initial public offering price of $18.00 per share, less the
applicable exercise price per share, multiplied by the number of shares
underlying such options.

Aggregated option exercises in the year ended December 31, 1999 and year-end
option values
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                             Number of securities
                           Shares           underlying unexercised     Value of unexercised
                         acquired           options at December 31,    in-the-money options
                             upon    Value           1999              at December 31, 1999
Name                     exercise realized Exercisable Unexercisable Exercisable Unexercisable
- ----------------------------------------------------------------------------------------------
<S>                      <C>      <C>      <C>         <C>           <C>         <C>
Mark B. Chandler........       --      $--          --       510,000         $--    $7,180,800
Van S. Chandler.........       --       --          --       153,000          --     2,154,240
Ralph L. McDade.........       --       --     142,798       112,202   2,010,596     1,579,804
Michael D. Spain........       --       --      67,997        85,003     957,398     1,196,842
James L. Persky.........       --       --      67,999       136,001     957,426     1,914,894
</TABLE>

EMPLOYMENT AGREEMENTS

Each of our executive officers has an employment agreement expiring on
March 10, 2003. These agreements provide for set annual base salaries as
follows:

<TABLE>
<CAPTION>
                                                                          Annual
                                                                            base
            Executive                                                     salary
- --------------------------------------------------------------------------------
            <S>                                                         <C>
            Mark B. Chandler........................................... $275,000
            Michael L. Bengtson........................................  250,000
            Ralph L. McDade............................................  190,000
            Van S. Chandler............................................  190,000
            Michael D. Spain...........................................  190,000
            James L. Persky............................................  180,000
            Randel S. Marfin...........................................  160,000
</TABLE>

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52
<PAGE>

Management

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In addition, the agreements provide for incentive bonuses as determined by the
compensation committee or board of directors.

Each of these executives has agreed not to compete with us during the term of
the agreement and for one year after resignation or termination. The agreements
provide for the payment of salary for 12 months after any termination by
Luminex other than for cause, as long as there has not been a change in
control. The employment agreements define "cause" as an employee committing an
immoral crime, materially breaching the employment agreement or failing to obey
written directions of a senior corporate executive. A "change of control" will
be deemed to occur if a substantial portion of our ownership changes or the
constitution of the board changes during any 15-month period without the
approval of our board of directors or stockholders. Further, if the termination
follows a change of control, we will pay the executive a lump sum equal to 2.99
times the executive's average annual base salary plus bonus for the most recent
five calendar years prior to the occurrence of the change of control. The
agreements also provide for additional payments to compensate the executives
for any tax liability imposed on change of control payments to the extent these
payments constitute "parachute payments" under Section 280G of the Internal
Revenue Code. In addition, upon a change of control, all outstanding options
held by executives with employment agreements will vest.

Mr. Bengtson has agreed to join our company as Executive Vice President,
General Counsel and Secretary upon completion of this offering. In addition to
the compensation set forth above, we have granted Mr. Bengtson stock options to
purchase 255,000 shares of common stock at an exercise price of $11.76 per
share. The option agreement provides that the options vest monthly over three
years.

EMPLOYEE BENEFIT PLANS

1996 Stock Option Plan

Our 1996 Stock Option Plan was approved by our board of directors in March 1996
and subsequently amended by our stockholders on May 11, 1998. Our 1996 plan
authorizes the issuance of up to 4,080,000 shares of our common stock as either
incentive stock options within the meaning of Section 422 of the Internal
Revenue Code of 1986 or nonqualified stock options. As of March 21, 2000, we
had 3,248,634 options to purchase common stock under this plan outstanding to
employees, directors and consultants with a weighted average exercise price of
$3.18 per share. After the completion of this offering, no further options will
be granted under this plan.

The board of directors, or a board committee, has the power to determine the
terms of the options, including the exercise price of the options, the number
of shares subject to each option, the exercisability thereof, and the form of
consideration payable on such exercise, provided that the exercise price for
incentive stock options must be at least 100% of fair market value. Incentive
stock options granted to any holder of 10% or more of the combined voting power
of all classes of stock must have an exercise price of not less than 110% of
fair market value and be exercisable for a term of no more than five years.

2000 Long-Term Incentive Plan

Our 2000 Long-Term Incentive Plan has been adopted by our board of directors
and our stockholders as a successor equity plan to our 1996 plan. We may grant
options to purchase up to 3,570,000 shares of common stock under the 2000 plan.
As of March 21, 2000, 982,500 shares were reserved for issuance upon the
exercise of outstanding options and 2,587,500 shares remained available for
future grant.

The 2000 plan provides for the discretionary grant of incentive stock options,
within the meaning of Section 422 of the Internal Revenue Code of 1986, to
employees and for the grant of nonqualified stock options, stock appreciation
rights, dividend equivalents, restricted stock and other incentive awards to
employees, outside directors and consultants. The 2000 plan provides that we
cannot issue incentive stock options after January 2010.

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

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Management

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


The 2000 plan is administered by the board of directors or a board committee.
The administrator has the power to determine the terms of the options or other
awards granted, including the exercise price of the options or other awards,
the number of shares subject to each option or other award (up to 357,000 per
year per participant), the exercisability thereof and the form of consideration
payable upon exercise. In addition, the administrator has the authority to
amend, suspend or terminate the 2000 plan, provided that no such action may
affect any share of common stock previously issued and sold or any option
previously granted under the 2000 plan without the consent of the holder.

The exercise price of all incentive stock options granted under the 2000 plan
must be at least equal to 100% of the fair market value of the common stock on
the date of grant. The exercise price of nonqualified stock options and other
awards granted under the 2000 plan is determined by the administrator, but the
exercise price must be at least 50% of the fair market value of the common
stock on the date of grant. The term of all options granted under the 2000 plan
may not exceed ten years.

Each option and other award is exercisable during the lifetime of the optionee
only by such optionee. Options granted under the 2000 plan must generally be
exercised within 60 days after the end of optionee's status as an employee,
director or consultant, or within one year after such optionee's termination by
disability or death, respectively, but in no event later than the expiration of
the option's term.

The 2000 plan provides that in the event of a merger of our company all options
and other awards shall be assumed or a substitute option or award issued by the
acquiring company unless the board determines in its sole discretion to
accelerate vesting or remove any restrictions.

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

54
<PAGE>


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

Related party transactions

SALES OF SECURITIES

Since January 1, 1997 through February 29, 2000, we have issued the following
securities in private placement transactions:

 .150,000 shares of our Series B convertible preferred stock, at a purchase
 price of $40.00 per share, for an aggregate purchase price of $6,000,000
 between February and April 1997;

 .151,571 shares of our Series C convertible preferred stock, at a purchase
 price of $80.00 per share, for an aggregate purchase price of $12,125,680 in
 June and July 1998;

 .57,538 shares of our Series D convertible preferred stock, at a purchase price
 of $120.00 per share, for an aggregate purchase price of $6,904,560 between
 August and December 1999; and

 .25,000 shares of our Series E convertible preferred stock, at a purchase price
 of $120.00 per share, for an aggregate purchase price of $3,000,000 in
 December 1999.

All preferred stock was issued to accredited investors in reliance upon
exemption from registration under Regulation D of the Securities Act.

The purchasers of more than $60,000 of these securities include, among others,
the following directors of Luminex:

<TABLE>
<CAPTION>
                                   Shares of preferred stock
- -------------------------------------------------------------------------------
                                                                          Total
                              Series B Series C Series D Series E consideration
- -------------------------------------------------------------------------------
<S>                           <C>      <C>      <C>      <C>      <C>
Robert J. Cresci.............   1,875    1,500     --         --       $195,000
Laurence E. Hirsch...........   5,000    6,250     --         --        700,000
Jim D. Kever(1)..............   5,000    2,000     --         --        360,000
Fred C. Goad, Jr. ...........   3,750    6,000    300         --        666,000
John E. Koerner, III(2)......  25,000   12,500     --     25,000      5,000,000
</TABLE>
- --------
(1) Includes 3,621 shares of Series B preferred stock held by a trust in which
    Mr. Kever is the trustee. Mr. Kever disclaims beneficial ownership of the
    shares held by the trust.
(2) These shares are held by Koerner Capital Corporation of which Mr. Koerner
    is the sole stockholder.

For additional information regarding the ownership of securities by executive
officers, directors and stockholders who beneficially own 5% or more of our
outstanding common stock, please see "Principal stockholders."

CONSULTING AGREEMENT

On June 1, 1999 we entered into a consulting agreement with A. Sidney Alpert, a
director of Luminex, whereby Mr. Alpert agreed to provide us with consulting
services one day per week. In consideration for those services, we paid Mr.
Alpert $5,833 per month and granted him options to purchase 51,000

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

                                                                              55
<PAGE>

Related party transactions

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

shares of our common stock at an exercise price of $3.92 per share. The options
vest on June 1, 2000. On November 1, 1999, we amended that agreement to
increase the number of days to two per week and to increase the consulting fee
to be paid to Mr. Alpert to $11,666 per month.

OTHER TRANSACTIONS

In April 1997, we paid Southcoast Capital Corporation $266,000 in cash and
issued warrants to Southcoast to purchase 535,500 shares of our common stock at
an exercise price of $1.96 per share for acting as placement agent for the sale
of our Series B convertible preferred stock. The warrants may be exercised in
whole or in part at any time prior to April 3, 2002. At the time of the
transaction, G. Walter Loewenbaum was the chairman and chief executive officer
of Southcoast.

During 1997, we paid Van Chandler, a director of Luminex, $136,000 for
consulting services.

On January 1, 1998, we purchased office and laboratory equipment from Inland
Laboratories, Inc. for $208,782 in cash and 286,102 shares of our common stock.
Mark B. Chandler, our chairman, president and chief executive officer, is the
sole stockholder of Inland.

In July 1998, we paid Loewenbaum & Company $849,000 for acting as placement
agent for the sale of our Series C convertible preferred stock. At the time of
the transaction, G. Walter Loewenbaum was the majority stockholder of
Loewenbaum & Company.

Upon the closing of this offering, Dain Rauscher Wessels, one of the
representatives of the underwriters, will pay a cash referral fee of
approximately $200,000 to LeCorgne, Loewenbaum & Co., LLC or Loewenbaum &
Company Incorporated, each of which is an affiliate of G. Walter Loewenbaum, a
director of Luminex, for introducing it to us.

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

56
<PAGE>


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

Principal stockholders

The following table shows information known to us with respect to the
beneficial ownership of our common stock as of March 21, 2000, and as adjusted
to reflect the sale of the shares of common stock offered under this prospectus
by:

 .each person or group of affiliated persons who is known by us to own
 beneficially 5% or more of our common stock;

 .each of our directors;

 .each executive officer listed in the "Summary compensation" table above; and

 .all of our directors and executive officers as a group.

Except as indicated in the footnotes to this table and subject to community
property laws where applicable, the persons named in the table have sole voting
and investment power with respect to all shares of our common stock shown as
beneficially owned by them. Beneficial ownership and percentage ownership are
determined in accordance with the rules of the SEC. The table below includes
the number of shares underlying options and warrants which are exercisable
within 60 days from March 21, 2000 and assumes the conversion of all shares of
our preferred stock into shares of our common stock prior to this offering. It
is therefore based on 22,176,070 shares of our common stock outstanding prior
to this offering and 26,676,070 shares outstanding immediately after this
offering. The address for those individuals for which an address is not
otherwise indicated is: 12212 Technology Boulevard, Austin, Texas 78727.

<TABLE>
<CAPTION>
                                          Number of           Number of Percent owned
                                             shares   shares underlying   before this       Percent owned
Beneficial Owner                        outstanding options or warrants      offering after this offering
- ---------------------------------------------------------------------------------------------------------
Directors and Named Executive Officers
<S>                                     <C>         <C>                 <C>           <C>
Mark B. Chandler, Ph.D. ............      3,733,702             175,554          17.5                14.6

Van S. Chandler.....................      1,916,921              53,777           8.9                 7.4

Ralph L. McDade, Ph.D. .............         10,200             182,975             *                   *

Michael D. Spain, M.D. .............             --             121,221             *                   *

James L. Persky.....................             --             138,221             *                   *

G. Walter Loewenbaum (1)(2).........      3,447,600             415,907          17.1                14.3

A. Sidney Alpert....................        204,000              10,200             *                   *

Robert J. Cresci....................        119,850              51,000             *                   *

Laurence E. Hirsch..................        331,500              10,200           1.5                 1.3

Fred C. Goad, Jr. (3)...............        245,820              51,000           1.3                 1.0

Jim D. Kever (4)....................        203,998              51,000           1.1                   *

John E. Koerner, III (5)............      1,425,960              51,000           6.6                 5.5

William L. Roper MD, MPH............             --              15,000             *                   *

All directors and executive officers
   as a group (15 persons)..........     11,645,332           1,393,265          55.3                46.5
</TABLE>

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

                                                                              57
<PAGE>

Principal stockholders

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

<TABLE>
<CAPTION>
                           Number of           Number of Percent owned
                              shares   shares underlying   before this       Percent owned
Beneficial Owner         outstanding options or warrants      offering after this offering
- ------------------------------------------------------------------------------------------

Five percent
stockholders
<S>                      <C>         <C>                 <C>           <C>
R. Jerrold Fulton (6)...   1,672,800                  --           7.5                 6.3
 305 Evergreen Trail
 Cedar Hill, Texas 75104

John R. Kettman.........   1,363,059                  --           6.1                 5.1
 3119 Barton Road
 Carrollton, Texas 75007
</TABLE>
- --------

*  Less than 1.0%.

(1) Consists of 2,835,000 shares held by Mr. Loewenbaum and 612,000 shares of
    held by a partnership in which Mr. Loewenbaum is the general partner. Mr.
    Loewenbaum disclaims beneficial ownership of the shares held by the
    partnership.

(2) Includes 415,907 shares issuable upon the exercise of a warrant, 268,007 of
    which are held by Mr. Loewenbaum and 146,880 of which are held by a trust
    for the benefit of Mr. Loewenbaum's children.

(3) Includes 612 shares held by a trust of which Mr. Goad is the trustee. Mr.
    Goad disclaims beneficial ownership of the shares held by the trust.

(4) Consists of 85,811 shares held by Mr. Kever and 118,189 shares held by a
    trust of which Mr. Kever is the trustee. Mr. Kever disclaims beneficial
    ownership of the shares held by the trust.

(5) Includes 1,275,000 shares held by Koerner Capital Corporation of which Mr.
    Koerner is the sole stockholder and 150,960 shares held by two trusts for
    the benefit of his children. Mr Koerner disclaims beneficial ownership of
    the shares held by the trusts.

(6) Consists of 448,800 shares held by Dr. Fulton and 1,224,000 shares held by
    a partnership in which Dr. Fulton is the general partner. Dr. Fulton
    disclaims beneficial ownership of the shares held by the partnership.

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

58
<PAGE>


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

Description of capital stock

The following information describes our common stock and preferred stock, as
well as options and warrants to purchase our common stock, and provisions of
our certificate of incorporation and our bylaws, all as will be in effect upon
the closing of this offering. This description is only a summary. You should
also refer to the certificate and bylaws which have been filed with the SEC as
exhibits to our registration statement, of which this prospectus forms a part.
The descriptions of the common stock and preferred stock, as well as options
and warrants to purchase our common stock, reflect changes to our capital
structure that will occur upon the closing of this offering in accordance with
the terms of the certificate.

Upon completion of this offering, our authorized capital stock will consist of
200,000,000 shares of common stock, par value $.001 per share, and 5,000,000
shares of preferred stock, par value $.001 per share.

COMMON STOCK

As of March 21, 2000, there were 13,407,478 shares of common stock outstanding
and held of record by 127 stockholders. There will be 26,676,070 shares of
common stock outstanding upon the closing of this offering, which gives effect
to the issuance of 4,500,000 shares of common stock offered by us under this
prospectus and the conversion of preferred stock discussed below.

Each share of common stock has identical rights and privileges in every
respect. The holders of our common stock are entitled to vote upon all matters
submitted to a vote of our stockholders and are entitled to one vote for each
share of common stock held.

Subject to the prior rights and preferences, if any, applicable to shares of
preferred stock or any series of preferred stock, the holders of common stock
are entitled to receive such dividends, payable in cash, stock or otherwise, as
may be declared by our board out of any funds legally available for the payment
of dividends.

If we voluntarily or involuntarily liquidate, dissolve or wind-up, the holders
of common stock will be entitled to receive after distribution in full of the
preferential amounts, if any, to be distributed to the holders of preferred
stock or any series of preferred stock, all of the remaining assets available
for distribution ratably in proportion to the number of shares of common stock
held by them. Holders of common stock have no preferences or any preemptive
conversion or exchange rights.

PREFERRED STOCK

As of March 21, 2000, there were 841,359 shares of convertible preferred stock
outstanding. Upon the closing of this offering, all outstanding shares of
convertible preferred stock will be converted into 8,768,592 shares of our
common stock and will be held of record by 214 stockholders. These shares of
convertible preferred stock will no longer be authorized, issued or
outstanding. Our certificate of incorporation authorizes the issuance of
5,000,000 shares of preferred stock, par value $.001 per share.

Our board is authorized to provide for the issuance of shares of preferred
stock in one or more series, and to fix for each series voting rights, if any,
designations, preferences and relative, participating, optional or other
special rights and such qualifications, limitations or restrictions as provided
in a

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

                                                                              59
<PAGE>

Description of capital stock

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

resolution or resolutions adopted by the board. The board may authorize the
issuance of shares of preferred stock with terms and conditions which could
discourage a takeover or other transaction that holders of some or a majority
of shares of common stock might believe to be in their best interests or in
which holders of common stock might receive a premium for their shares over the
then market price.

WARRANTS

As of March 21, 2000, warrants to purchase a total of 535,500 shares of our
common stock, at an exercise price of $1.96 per share, were outstanding. The
warrants contain anti-dilution provisions providing for adjustments of the
exercise price and the number of shares underlying the warrants upon the
occurrence of certain events, including any recapitalization, reclassification,
stock dividend, stock split, stock combination or similar transaction. The
warrants expire April 2, 2002. The warrants grant to the holders registration
rights with respect to the common stock issuable upon their exercise, which are
described below. All of these warrants will be exercisable immediately before
this offering.

REGISTRATION RIGHTS

At any time six months following the effective date of this offering, the
holders of warrants to purchase 535,500 shares of common stock will be entitled
to demand the registration of their shares under the Securities Act of 1933. We
are not required to effect more than one registration for such holders pursuant
to these demand registration rights, which expire on April 2, 2002. In
addition, after the closing of this offering these holders will be entitled to
piggyback registration rights with respect to the registration of the shares of
common stock underlying their warrants. If we propose to register any shares of
common stock either for our account or for the account of other security
holders, the holders of shares having piggyback rights are entitled to receive
notice of the registration and are entitled to include their shares in the
registration. These registration rights are subject to conditions and
limitations, among which is the right of the underwriters of an offering to
limit the number of shares of common stock held by security holders with
registration rights to be included in such registration. We are generally
required to bear all of the expenses of all these registrations, including the
reasonable fees of a single counsel acting on behalf of all selling
stockholders, except underwriting discounts and selling commissions.
Registration of any of the shares of our common stock held by security holders
with registration rights would result in such shares becoming freely tradable
without restriction under the Securities Act of 1933 immediately upon
effectiveness of such registration.

ANTI-TAKEOVER EFFECTS OF PROVISIONS OF THE CERTIFICATE OF INCORPORATION, BYLAWS
AND DELAWARE LAW

We are subject to Section 203 of the Delaware General Corporation Law, or DGCL
Section 203, which regulates corporate acquisitions. DGCL Section 203 prevents
certain Delaware corporations, including those whose securities are listed for
trading on the Nasdaq National Market, from engaging, under certain
circumstances in a "business combination" with any "interested stockholder" for
three years following the date that such stockholder became an interested
stockholder. For purposes of DGCL Section 203, a "business combination"
includes, among other things, a merger or consolidation involving Luminex and
the interested stockholder and the sale of more than ten percent (10%) of
Luminex's assets. In general, DGCL Section 203 defines an "interested
stockholder" as any entity or person beneficially owning 15% or more of the
outstanding voting stock of Luminex and any entity or person affiliated with or
controlling or controlled by such entity or person. A Delaware corporation may
"opt out" of DGCL Section 203 with an express provision in its original
certificate of

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

60
<PAGE>

Description of capital stock

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

incorporation or an express provision in its certificate of incorporation or
bylaws resulting from amendments approved by the holders of at least a majority
of the corporation's outstanding voting shares. We have not "opted out" of the
provisions of DGCL Section 203.

Our certificate of incorporation provides that the board of directors is
divided into three classes of directors, with each class serving a staggered
three-year term. The classification system of electing directors may tend to
discourage a third party from making a tender offer or otherwise attempting to
obtain control of Luminex and may maintain the incumbency of the board of
directors, as the classification of the board of directors generally increases
the difficulty of replacing a majority of the directors. The certificate of
incorporation also provides that all stockholder actions must be effected at a
duly called meeting and not by a consent in writing. Further, certain
provisions of our certificate of incorporation provide that the stockholders
may amend the bylaws or certain provisions of the certificate of incorporation
only with the affirmative vote of 75% of our capital stock. These provisions of
the certificate of incorporation and bylaws could discourage potential
acquisition proposals and could delay or prevent a change in control of
Luminex. These provisions are intended to enhance the likelihood of continuity
and stability in the composition of the board of directors and in the policies
formulated by the board of directors and to discourage certain types of
transactions that may involve an actual or threatened change of control of
Luminex. These provisions are designed to reduce our vulnerability to an
unsolicited acquisition proposal. The provisions also are intended to
discourage certain tactics that may be used in proxy fights. However, such
provisions could have the effect of discouraging others from making tender
offers for our shares and, as a consequence, they also may inhibit fluctuations
in the market price of our shares that could result from actual or rumored
takeover attempts. Such provisions also may have the effect of preventing
changes in our management.

Our bylaws provide that any action required or permitted to be taken by our
stockholders at an annual meeting or special meeting of stockholders may only
be taken if each stockholder is given proper advance notice of the action. The
bylaws further provide that special meetings of stockholders may only be called
by a majority of our board of directors, our chairman of the board of directors
or our president. The foregoing provisions could have the effect of delaying
until the next stockholders meeting stockholder actions which are favored by
the holders of a majority of our outstanding voting securities.


TRANSFER AGENT AND REGISTRAR

The transfer agent and registrar for our common stock is ChaseMellon
Shareholder Services.

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

                                                                              61
<PAGE>


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

Shares eligible for future sale

Prior to this offering, there has been no public market for our common stock.
The market price of our common stock after this offering could decline as a
result of the sale of a large number of shares of our common stock in the
market, or the perception that such sales could occur. Such sales also could
make it more difficult for us to sell equity securities in the future at a time
and price that we deem appropriate. Based on the number of shares outstanding
at March 21, 2000, after this offering, we will have 26,676,070 outstanding
shares of common stock. Of these shares, the shares being offered hereby are
freely tradable. This leaves 22,176,070 shares eligible for sale in the public
market as follows:

<TABLE>
<CAPTION>
 Number
 of Shares  Date
- -----------------------------------------------------------------------------
 <C>        <S>
     --     After the date of this prospectus
            At various times after 90 days from the date of this prospectus
 736,422    under Rule 701
 21,439,648 At various times after 180 days from the date of this prospectus,
            subject, in some cases, to volume limitations under Rule 144
</TABLE>

The holders of 98.8% of our common stock, including all of our directors and
officers, together with the holders of options to purchase 2,106,300 shares of
common stock and the holders of warrants to purchase 535,500 shares of common
stock, have entered into lock-up agreements under which they have agreed with
the underwriters not to offer, sell, contract to sell, hedge or otherwise
dispose of, directly or indirectly, or file with the SEC a registration
statement under the Securities Act relating to, any of its common stock or
securities convertible into or exchangeable for shares of common stock during
the period from the date of this prospectus continuing through the date 180
days after the date of this prospectus, without the prior written consent of
Warburg Dillon Read LLC.

In general, under Rule 144 of the Securities Act of 1933, a person or persons
whose shares are required to be aggregated, including an affiliate, whose
shares have been owned for at least one year is entitled to sell, within any
three-month period after the date of this prospectus, a number of shares that
does not exceed the greater of 1% of the then outstanding shares of common
stock -- approximately 264,728 shares immediately after this offering -- or the
average weekly trading volume in our common stock during the four calendar
weeks preceding the date on which notice of such sale is filed, subject to
certain restrictions. In addition, a person who is not deemed to have been an
affiliate of ours at any time during the 90 days preceding a sale and whose
shares have been beneficially owned by nonaffiliates for at least two years
would be entitled to sell such shares under Rule 144(k) without regard to the
requirements described above. To the extent that shares were acquired from one
of our affiliates, such person's holding period for the purpose of effecting a
sale under Rule 144 commences on the date of transfer from the affiliate.

Following 90 days after the date of this prospectus, shares issued upon
exercise of options that we granted prior to the date of this offering will
also be available for sale in the public market pursuant to Rule 701 under the
Securities Act of 1933. Rule 701 permits resales of such shares in reliance
upon Rule 144 under the Securities Act of 1933 but without compliance with the
restrictions, including the holding-period requirement, imposed under Rule 144.
As of March 21, 2000, options to purchase a total of 4,224,338 shares of common
stock were outstanding, 1,399,373 of which were currently exercisable. Of these
4,224,338 shares, 736,422 shares may be eligible for sale in the public market
at various times after 90 days from the date of this prospectus.

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

62
<PAGE>

Shares eligible for future sale

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

Approximately 180 days after the date of this prospectus, we intend to file a
registration statement to register for resale the 4,231,134 shares of common
stock reserved for issuance under our stock option plans. We expect the
registration statement to become effective immediately upon filing. Shares
issued upon the exercise of stock options granted under our stock option plans
will be eligible for resale in the public market from time to time subject to
vesting and, in the case of certain options, the expiration of the lock-up
agreements referred to above.

Stockholders holding warrants to purchase 535,500 shares of common stock have
the right, subject to various conditions and limitations, to include their
shares in registration statements relating to our securities. By exercising
their registration rights and causing a large number of shares to be registered
and sold in the public market, these holders may cause the price of the common
stock to fall. In addition, any demand to include such shares in our
registration statements could have a material adverse effect on our ability to
raise needed capital. See "Management -- Benefit plans," "Principal
stockholders," "Shares eligible for future sale" and "Underwriting."

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

                                                                              63
<PAGE>


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

Underwriting

Luminex and the underwriters for the offering named below have entered into an
underwriting agreement concerning the shares being offered. Subject to
conditions, each underwriter has severally agreed to purchase the number of
shares indicated in the following table. Warburg Dillon Read LLC, Lehman
Brothers Inc. and Dain Rauscher Incorporated are the representatives of the
underwriters.

<TABLE>
<CAPTION>
                                                                          Number
Underwriters                                                           of shares
- --------------------------------------------------------------------------------
<S>                                                                    <C>
Warburg Dillon Read LLC..............................................
Lehman Brothers Inc..................................................
Dain Rauscher Incorporated...........................................
                                                                       ---------
  Total..............................................................  4,500,000
                                                                       =========
</TABLE>

If the underwriters sell more shares than the total number set forth in the
table above, the underwriters have a 30-day option to buy from us up to an
additional 675,000 shares at the initial public offering price less the
underwriting discounts and commissions to cover these sales. If any shares are
purchased under this option, the underwriters will severally purchase shares in
approximately the same proportion as set forth in the table above.

The following table shows the per share and total underwriting discounts and
commissions we will pay to the underwriters. These amounts are shown assuming
both no exercise and full exercise of the underwriters' option to purchase up
to an additional 675,000 shares.

<TABLE>
<CAPTION>
                                                       No exercise Full exercise
- --------------------------------------------------------------------------------
<S>                                                    <C>         <C>
Per share............................................   $             $
  Total..............................................   $             $
</TABLE>

We estimate that the total expenses of the offering payable by us, excluding
underwriting discounts and commissions, will be approximately $700,000.

Shares sold by the underwriters to the public will initially be offered at the
initial public offering price set forth on the cover of this prospectus. Any
shares sold by the underwriters to securities dealers may be sold at a discount
of up to $           per share from the initial public offering price. Any of
these securities dealers may resell any shares purchased from the underwriters
to other brokers or dealers at a discount of up to $           per share from
the initial public offering price. If all the shares are not sold at the
initial public offering price, the representatives may change the offering
price and the other selling terms.

The underwriters have informed us that they do not expect discretionary sales
to exceed 5% of the shares of common stock to be offered.

Luminex, its directors, officers and certain of its stockholders have agreed
with the underwriters not to offer, sell, contract to sell, hedge or otherwise
dispose of, directly or indirectly, or file with the SEC a registration
statement under the Securities Act relating to, any of its common stock or
securities convertible into or exchangeable for shares of common stock during
the period from the date of this prospectus continuing through the date 180
days after the date of this prospectus, without the prior written consent of
Warburg Dillon Read LLC.

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

64
<PAGE>

Underwriting

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


The underwriters have reserved for sale, at the initial public offering price,
up to 225,000 shares of our common stock being offered for sale to our
customers and business partners. At the discretion of our management, other
parties, including our employees, may participate in the reserve shares
program. The number of shares available for sale to the general public in the
offering will be reduced to the extent these persons purchase reserved shares.
Any reserved shares not so purchased will be offered by the underwriters to the
general public on the same terms as the other shares in this offering.

Prior to this offering, there has been no public market for our common stock.
The initial public offering price will be negotiated by us and the
representatives. The principal factors to be considered in determining the
initial public offering price include:

 .the information set forth in this prospectus and otherwise available to the
 representatives;

 .the history and the prospects for the industry in which we compete;

 .the ability of our management;

 .our prospects for future earnings, the present state of our development, and
 our current financial position;

 .the general condition of the securities markets at the time of this offering;
 and

 .the recent market prices of, and the demand for, publicly traded common stock
 of generally comparable companies.

In connection with the offering, the underwriters may purchase and sell shares
of common stock in the open market. These transactions may include short sales,
stabilizing transactions and purchases to cover positions created by short
sales. Short sales involve the sale by the underwriters of a greater number of
shares than they are required to purchase in the offering. Stabilizing
transactions consist of bids or purchases made for the purpose of preventing or
retarding a decline in the market price of the common stock while the offering
is in progress.

The underwriters also may impose a penalty bid. This occurs when a particular
underwriter repays to the underwriters a portion of the underwriting discount
received by it because the representatives have repurchased shares sold by or
for the account of that underwriter in stabilizing or short covering
transactions.

These activities by the underwriters may stabilize, maintain or otherwise
affect the market price of the common stock. As a result, the price of the
common stock may be higher than the price that otherwise might exist in the
open market. If these activities are commenced, they may be discontinued by the
underwriters at any time. These transactions may be effected on the Nasdaq
National Market, in the over-the-counter market or otherwise.

We have agreed to indemnify the several underwriters against some liabilities,
including liabilities under the Securities Act of 1933 and to contribute to
payments that the underwriters may be required to make in respect thereof.

Upon the closing of this offering, Dain Rauscher Wessels will pay a cash
referral fee of approximately $200,000 to LeCorgne, Loewenbaum & Co., LLC or
Loewenbaum & Company Incorporated, each of which is an affiliate of G. Walter
Loewenbaum, a director of Luminex, for introducing it to us.

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

                                                                              65
<PAGE>


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

Legal matters

The validity of the shares of common stock offered hereby will be passed upon
for Luminex Corporation by Thompson & Knight LLP, Austin, Texas. Certain
partners of Thompson & Knight LLP maintain beneficial ownership of 26,520
shares of our common stock. Dewey Ballantine LLP, New York, New York, is acting
as counsel for the underwriters in connection with various legal matters
relating to the shares of common stock offered by this prospectus.

Experts

Ernst & Young LLP, independent auditors, have audited our financial statements
at December 31, 1998 and 1999, and for each of the three years in the period
ended December 31, 1999 as set forth in their report. We have included our
financial statements in this prospectus in reliance on Ernst & Young LLP's
report given on their authority as experts in accounting and auditing.

Where you can find more information

We have filed with the SEC a registration statement on Form S-1 (including
exhibits, schedules and amendments) under the Securities Act with respect to
the shares of common stock to be sold in this offering. This prospectus does
not contain all the information set forth in the registration statement. For
further information with respect to us and the shares of common stock to be
sold in this offering, reference is made to the registration statement.
Statements contained in this prospectus as to the contents of any contract,
agreement or other document referred to are not necessarily complete. Whenever
a reference is made in this prospectus to any contract or other document of
ours, the reference may not be complete, and you should refer to the exhibits
that are apart of the registration statement for a copy of the contract or
document.

You may read and copy all or any portion of the registration statement or any
other information Luminex files at the SEC's public reference room at 450 Fifth
Street, N.W., Washington, D.C. 20549. You can request copies of these
documents, upon payment of a duplicating fee, by writing to the SEC. Please
call the SEC at 1-800-SEC-0330 for further information on the operation of the
public reference rooms. Our SEC filings, including the registration statement,
are also available to you on the SEC's web site (http://www.sec.gov).

As a result of this offering, we will become subject to the information and
reporting requirements of the Securities Exchange Act, and, in accordance with
those requirements, will file periodic reports, proxy statements and other
information with the SEC.

This prospectus includes statistical data that were obtained from industry
publications. These industry publications generally indicate that the authors
of these publications have obtained information from sources believed to be
reliable, but do not guarantee the accuracy and completeness of their
information. While we believe these industry publications to be reliable, we
have not independently verified their data.


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

66
<PAGE>

Luminex Corporation

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


INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                            Page
- --------------------------------------------------------------------------------
<S>                                                                         <C>
Report of Independent Auditors.............................................  F-2
Balance Sheets.............................................................  F-3
Statements of Operations...................................................  F-4
Statements of Changes in Stockholders' Equity..............................  F-5
Statements of Cash Flows...................................................  F-6
Notes to Financial Statements..............................................  F-7
</TABLE>

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

                                                                             F-1
<PAGE>

Luminex Corporation

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

REPORT OF INDEPENDENT AUDITORS

The Board of Directors
Luminex Corporation

We have audited the accompanying balance sheets of Luminex Corporation as of
December 31, 1998 and 1999, and the related statements of operations, changes
in stockholders' equity and cash flows for each of the three years in the
period ended December 31, 1999. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audits.

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

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Luminex Corporation at
December 31, 1998 and 1999, and the results of its operations and its cash
flows for each of the three years in the period ended December 31, 1999, in
conformity with accounting principles generally accepted in the United States.

                                          /s/ Ernst & Young LLP

Austin, Texas
January 28, 2000, except for Notes 4 and 10,
as to which the date is March 9, 2000

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

F-2
<PAGE>

Luminex Corporation

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

BALANCE SHEETS
(in thousands, except share and per share amounts)

<TABLE>
<CAPTION>
                                                                     Pro Forma
                                                                 Stockholders'
                                                                        Equity
                                               December 31,       December 31,
                                                 1998      1999           1999
- -------------------------------------------------------------------------------
                                                                   (unaudited)
<S>                                          <C>       <C>       <C>
Assets
Current assets:
 Cash and cash equivalents.................    $8,537    $4,083
 Short-term investments....................        --     4,929
 Accounts receivable, net of allowance for
    doubtful accounts of $14 in 1998 and
    $64 in 1999............................       146     1,341
 Inventory.................................        47       663
 Other.....................................        61       181
                                             --------  --------
Total current assets.......................     8,791    11,197
Property and equipment, net................       799     1,369
                                             --------  --------
Total assets...............................    $9,590   $12,566
                                             ========  ========
Liabilities and Stockholders' Equity
Current liabilities:
 Accounts payable..........................      $168      $373
 Accrued liabilities.......................       158       278
 Deferred revenue..........................        74       120
                                             --------  --------
Total current liabilities..................       400       771
Deferred revenue...........................        --       600

Stockholders' equity:
 Preferred Stock, $2 par value, 5,000,000
    shares authorized:
  Series A Convertible Preferred Stock, $2
     stated value, shares issued and
     outstanding: 457,250 in 1998 and 1999;
     no shares pro forma...................       915       915            $--
  Series B Convertible Preferred Stock, $40
     stated value, shares issued and
     outstanding: 150,000 in 1998 and 1999;
     no shares pro forma...................     6,000     6,000             --
  Series C Convertible Preferred Stock, $80
     stated value, shares issued and
     outstanding: 151,571 in 1998 and 1999;
     no shares pro forma...................    12,126    12,126             --
  Series D Convertible Preferred Stock,
     $120 stated value, shares issued and
     outstanding: 57,538 in 1999; no shares
     pro forma.............................        --     6,905             --
  Series E Convertible Preferred Stock,
     $120 stated value, shares issued and
     outstanding: 25,000 in 1999; no shares
     pro forma.............................        --     3,000             --
 Common Stock, $.001 par value, 50,000,000
    shares authorized; shares issued and
    outstanding: 13,133,849 and 13,167,754
    in 1998 and 1999, respectively;
    21,936,346 shares pro forma............        13        13             22
 Warrants to purchase 535,500 shares of
    Common Stock at $1.96 per share........       180       180            180
 Additional paid-in capital................       336     5,511         34,448
 Deferred stock compensation...............        --      (467)          (467)
 Accumulated deficit.......................   (10,380)  (22,988)       (22,988)
                                             --------  --------       --------
Total stockholders' equity.................     9,190    11,195       $ 11,195
                                             --------  --------       ========
Total liabilities and stockholders'
   equity..................................    $9,590   $12,566
                                             ========  ========
</TABLE>

See accompanying notes.

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

                                                                             F-3
<PAGE>

Luminex Corporation

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

STATEMENTS OF OPERATIONS
(in thousands, except per share amounts)

<TABLE>
<CAPTION>
                                                    Year ended December 31,
                                                       1997     1998      1999
- -------------------------------------------------------------------------------
<S>                                                 <C>      <C>      <C>
Revenue:
 Product..........................................      $99     $386    $2,606
 Grant............................................       --       --       506
                                                    -------  -------  --------
Total revenue.....................................       99      386     3,112
Cost of product revenue...........................       10       88     1,172
                                                    -------  -------  --------
Gross margin......................................       89      298     1,940
Operating expenses:
 Research and development.........................    1,594    3,611     6,188
 Selling, general and administrative..............    1,426    2,566     5,238
                                                    -------  -------  --------
Total operating expenses..........................    3,020    6,177    11,426
                                                    -------  -------  --------
Loss from operations..............................   (2,931)  (5,879)   (9,486)
Interest income...................................      178      283       284
                                                    -------  -------  --------
Net loss..........................................   (2,753)  (5,596)   (9,202)
Accretion of discount on convertible preferred
   stock..........................................      --       --     (3,406)
                                                    -------  -------  --------
Net loss applicable to common stockholders........  $(2,753) $(5,596) $(12,608)
                                                    =======  =======  ========
Net loss per share, basic and diluted ............   $(0.21)  $(0.43)   $(0.96)
                                                    =======  =======  ========
Shares used in computing net loss per share, basic
   and diluted....................................   12,842   13,086    13,151
Pro forma net loss per share, basic and diluted
   (unaudited)....................................                      $(0.45)
                                                                      ========
Shares used in computing pro forma net loss per
   share, basic and diluted (unaudited)...........                      20,529
</TABLE>

See accompanying notes.

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

F-4
<PAGE>

Luminex Corporation

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

STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
(in thousands, except share amounts)

<TABLE>
<CAPTION>
                            Convertible                                                                              Total
                          Preferred Stock    Common Stock             Additional      Deferred               Stockholders'
                            Number             Number                    Paid-in         Stock  Accumulated         Equity
                         of Shares  Amount  of Shares Amount Warrants    Capital  Compensation      Deficit      (Deficit)
- ---------------------------------------------------------------------------------------------------------------------------
<S>                      <C>       <C>     <C>        <C>    <C>      <C>         <C>           <C>          <C>
Balance at December 31,
  1996..................   457,250    $915 12,842,308    $13      $--       $993           $--      $(2,031)         $(110)
 Issuance of Preferred
   Stock,
   Series B.............   150,000   6,000         --     --       --         --            --           --          6,000
 Stock issuance costs...        --      --         --     --      180       (353)           --           --           (173)
 Net loss...............        --      --         --     --       --         --            --       (2,753)        (2,753)
                           ------- ------- ----------    ---     ----    -------        ------     --------        -------
Balance at December 31,
  1997..................   607,250   6,915 12,842,308     13      180        640            --       (4,784)         2,964
 Issuance of Preferred
   Stock,
   Series C.............   151,571  12,126         --     --       --         --            --           --         12,126
 Stock issuance costs...        --      --         --     --       --       (868)           --           --           (868)
 Exercise of stock
   options..............        --      --      5,439     --       --          3            --           --              3
 Common stock issued for
   assets purchased.....        --      --    286,102     --       --        561            --           --            561
 Net loss...............        --      --         --     --       --         --            --       (5,596)        (5,596)
                           ------- ------- ----------    ---     ----    -------        ------     --------        -------
Balance at December 31,
  1998..................   758,821  19,041 13,133,849     13      180        336            --      (10,380)         9,190
 Issuance of Preferred
   Stock,
   Series D, net of
   discount.............    57,538   6,499         --     --       --        406            --           --          6,905
 Issuance of Preferred
   Stock,
   Series E, net of
   discount.............    25,000      --         --     --       --      3,000            --           --          3,000
 Stock issuance costs...        --      --         --     --       --         (8)           --           --             (8)
 Accretion of discount
   on convertible
   preferred stock......        --   3,406         --     --       --         --            --       (3,406)            --
 Exercise of stock
   options..............        --      --     33,905     --       --         47            --           --             47
 Deferred stock
   compensation related
   to stock options.....        --      --         --     --       --      1,730        (1,730)          --             --
 Amortization of
   deferred stock and
   stock compensation
   expense..............        --      --         --     --       --         --         1,263           --          1,263
 Net loss...............        --      --         --     --       --         --            --       (9,202)        (9,202)
                           ------- ------- ----------    ---     ----    -------        ------     --------        -------
Balance at December 31,
  1999..................   841,359 $28,946 13,167,754    $13     $180     $5,511         $(467)    $(22,988)       $11,195
                           ======= ======= ==========    ===     ====    =======        ======     ========        =======
Pro forma balance at
  December 31, 1999
  (unaudited)...........        --     $-- 21,936,346    $22     $180    $34,448         $(467)    $(22,988)       $11,195
                           ======= ======= ==========    ===     ====    =======        ======     ========        =======
</TABLE>

See accompanying notes.

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

                                                                             F-5
<PAGE>

Luminex Corporation

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

STATEMENTS OF CASH FLOWS
(in thousands)

<TABLE>
<CAPTION>
                                                     Year ended December 31,
                                                        1997     1998     1999
- -------------------------------------------------------------------------------
<S>                                                  <C>      <C>      <C>
Operating activities
Net loss...........................................  $(2,753) $(5,596) $(9,202)
Adjustment to reconcile net loss to cash used in
   operating activities:
 Depreciation expense..............................       69      220      330
 Amortization expense..............................       --      143      186
 Amortization of deferred stock and stock
    compensation expense...........................       --       --    1,263
 Changes in operating assets and liabilities:
  Accounts receivable..............................      (39)    (108)  (1,195)
  Inventory........................................      (44)      (3)    (616)
  Other assets.....................................      (13)     (48)    (120)
  Accounts payable.................................       59       64      205
  Accrued liabilities..............................     (167)     107      120
  Deferred revenue.................................       --       74      646
                                                     -------  -------  -------
Net cash used in operating activities..............   (2,888)  (5,147)  (8,383)
Investing activities
Purchase of short-term investments.................       --       --   (4,929)
Purchase of property and equipment.................     (132)    (399)  (1,085)
                                                     -------  -------  -------
Net cash used in investing activities..............     (132)    (399)  (6,014)
Financing activities
Proceeds from issuance of Common Stock.............       --        3       47
Proceeds from issuance of Preferred Stock..........    6,000   12,126    9,904
Stock issuance costs...............................     (173)    (867)      (8)
                                                     -------  -------  -------
Net cash provided by financing activities..........    5,827   11,262    9,943
Increase in cash and cash equivalents..............    2,807    5,716   (4,454)
Cash and cash equivalents, beginning of year.......       14    2,821    8,537
                                                     -------  -------  -------
Cash and cash equivalents, end of year.............   $2,821   $8,537   $4,083
                                                     =======  =======  =======
Non-cash activities
Common stock issued to acquire property and
   equipment from related party....................      $--     $561      $--
</TABLE>

See accompanying notes.

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

F-6
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS

1. Organization and business

Luminex Corporation (the "Company") was incorporated in the state of Texas in
May 1995. In June 1998, the Company reincorporated in the state of Delaware.
Since its formation, the Company's activities have been focused primarily on
the research and development of a unique molecular measurement and analysis
system (the LabMAP System) capable of performing multiple tests rapidly and
economically on a single patient sample.

From its inception through December 31, 1998, the Company's activities were
focused primarily on research and development and raising capital and,
accordingly, the Company was considered to be a development stage company. In
1999, the Company commenced shipments of its intended product, the Luminex 100,
and is no longer considered a development stage company.

2. Summary of significant accounting policies

Use of estimates
The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions
that affect the amounts reported in the financial statements and accompanying
notes. Actual amounts and results could differ from those estimates, and such
differences could be material to the financial statements.

Revenue recognition
Revenues from sales of the Company's products are recognized when persuasive
evidence of an agreement exists, delivery of the product has occurred, the fee
is fixed and determinable and collectibility is probable. Revenues from
royalties related to agreements with strategic partners are recognized when
such amounts are reported to the Company. No royalty revenues have been
recognized through December 31, 1999. The Company reserves for uncollectible
accounts based upon experience.

In accordance with the terms of the grant, grant revenue is recorded as
research expenses relating to the grant are incurred, provided that the amounts
received are not refundable if the research is not successful.

Amounts billed or collected in excess of revenue recognized is recorded as
deferred revenue.

Cash equivalents
Cash equivalents consist of cash deposits and investments with original
maturities of three months or less when purchased.

Short-term investments
In accordance with Statement of Financial Accounting Standards ("SFAS") No.
115, Accounting for Certain Investments in Debt and Equity Securities, the
Company's short-term investments are classified as held-to-maturity. Short-term
investments are classified as held-to maturity as the Company has the positive
intent and ability to hold the securities to maturity. Held-to-maturity
securities are stated at amortized cost, adjusted for amortization of premiums
and accretion of discounts to maturity. Such amortization is included in
interest income. Interest on securities classified as held-to-maturity is also
included in interest income.

All of the short-term investments mature within one year of December 31, 1999.

Concentration of credit risk and significant customers
Financial instruments which potentially subject the Company to concentrations
of credit risk consist of short-term investments and trade receivables. The
Company's short-term investments consist of investments in high credit quality
financial institutions and issuers.

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

                                                                             F-7
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)


The Company provides credit, in the normal course of business, to a number of
customers geographically dispersed primarily throughout the U.S. The Company
performs ongoing credit evaluations of its customers and maintains allowances
for potential credit losses.

The following table summarizes the changes in the allowance for doubtful
accounts for 1997, 1998, and 1999 (in thousands):

<TABLE>
<S>                                                                         <C>
Balance at December 31, 1996............................................... $--
  Additions charged to costs and expenses..................................  --
  Write-off of uncollectible accounts......................................  --
                                                                            ---
Balance at December 31, 1997...............................................  --
  Additions charged to costs and expenses..................................  14
  Write-off of uncollectible accounts......................................  --
                                                                            ---
Balance at December 31, 1998...............................................  14
  Additions charged to costs and expenses..................................  64
  Write-off of uncollectible accounts...................................... (14)
                                                                            ---
Balance at December 31, 1999............................................... $64
                                                                            ===
</TABLE>

Sales to individual customers constituting 10% or more of total revenues for
each year were as follows (in thousands):

<TABLE>
<CAPTION>
                                                                      Year ended
                                                                    December 31,
                                                                  1997  1998 1999
- ---------------------------------------------------------------------------------
<S>                                                               <C>   <C>  <C>
Customer No. 1...................................................  14%   --   --
Customer No. 2...................................................  10    --   --
Customer No. 3...................................................  10    --   --
Customer No. 4...................................................  10    --   --
Customer No. 5...................................................  10    --   --
Customer No. 6...................................................  --    --   10%
</TABLE>

Inventory
Inventory, consisting primarily of raw materials and purchased components, is
stated at the lower of cost or market. Cost is determined by the weighted
average method. The Company routinely assesses its on-hand inventory for timely
identification and measurement of obsolete, slow-moving, or otherwise impaired
inventory. As of December 31, 1998 and 1999, no such inventory had been
identified and no inventory reserves were recorded.

Property and equipment
Property and equipment are stated at cost. Property and equipment are
depreciated on a straight-line basis over the useful lives of the assets, which
are generally three to seven years. Leasehold improvements are amortized on a
straight-line basis over the shorter of the remaining term of the lease or its
estimated useful life.

Software costs
Purchased software is capitalized at cost and amortized over the estimated
useful life, generally five years. Software developed for use in the Company's
products is expensed as incurred and is classified as research and development
expense.

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

F-8
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)


Impairment of long-lived assets
In accordance with SFAS No. 121, Accounting for the Impairment of Long-Lived
Assets and for Long-Lived Assets to be Disposed of, if indicators of impairment
exist, the Company assesses the recoverability of the affected long-lived
assets by determining whether the carrying value of such assets can be
recovered through undiscounted future operating cash flows. If impairment is
indicated, the Company will measure the amount of such impairment by comparing
the carrying value of the asset to the present value of the expected future
cash flows associated with the use of the asset. To date, no such indicators of
impairment have been identified.

Research and development costs
Research and development costs are expensed in the period incurred. SFAS No.
86, Accounting for the Costs of Software to be Sold, Leased or Otherwise
Marketed, requires capitalization of certain software development costs
subsequent to the establishment of technological feasibility. Based on the
Company's product development process, technological feasibility is established
upon completion of a working model. Costs related to software development
incurred between completion of the working model and the point at which the
product is ready for general release have been insignificant. Through December
31, 1999, all software development costs have been expensed.

Patent costs
Costs related to patent applications and prosecution are expensed as incurred
as recoverability of such expenditures is uncertain.

Income taxes
The Company accounts for income taxes in accordance with SFAS No. 109,
Accounting for Income Taxes. This statement prescribes the use of the liability
method whereby deferred tax assets and liabilities are determined based on
differences between financial reporting and tax bases of assets and
liabilities, and are measured using enacted tax rates and laws that will be in
effect when the differences are expected to reverse.

Advertising costs
The Company expenses advertising costs as incurred. Advertising expenses were
not significant for all years presented.

Stock-based compensation
SFAS No. 123, Accounting for Stock-Based Compensation ("SFAS 123"), prescribes
accounting and reporting standards for all stock-based compensation plans,
including employee stock options. As allowed by SFAS 123, the Company has
elected to continue to account for its employee stock-based compensation in
accordance with Accounting Principles Board Opinion No. 25, Accounting for
Stock Issued to Employees.

Comprehensive income
In June 1997, the Financial Accounting Standards Board issued SFAS No. 130,
Reporting Comprehensive Income ("SFAS 130"), which establishes standards for
reporting comprehensive income and its components in a full set of financial
statements. The Company adopted SFAS 130 during the year ended December 31,
1998. There was no impact to the Company as a result of the adoption of SFAS
130, as there no differences between net loss and comprehensive loss for all
periods.

Segment reporting
The Company adopted SFAS No. 131, Disclosures About Segments of an Enterprise
and Related Information ("SFAS 131"), during 1998. SFAS 131 requires the use of
a management approach in identifying segments of an enterprise. Management has
determined that the Company operates in one business segment.

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

                                                                             F-9
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)


Net loss per share
In accordance with SFAS No. 128, Earnings Per Share, and SEC Staff Accounting
Bulletin (or SAB) No. 98, basic net income (loss) per share is computed by
dividing the net income (loss) for the period by the weighted average number of
common shares outstanding during the period. Diluted net income (loss) per
share is computed by dividing the net income (loss) for the period by the
weighted average number of common and common equivalent shares outstanding
during the period. Potentially dilutive securities composed of incremental
common shares issuable upon the exercise of stock options and warrants, and
common shares issuable on conversion of preferred stock, were excluded from
historical diluted loss per share because of their anti-dilutive effect.

Under the provisions of SAB No. 98, common shares issued for nominal
consideration, if any, would be included in the per share calculations as if
they were outstanding for all periods presented. No common shares have been
issued for nominal consideration.

Pro forma net loss per share has been computed as described above and also
gives effect to common equivalent shares arising from preferred stock that will
automatically convert upon the closing of the initial public offering
contemplated by this prospectus (using the as-if converted method from the
original date of issuance).

The following is a reconciliation of the numerator and denominator of basic and
diluted net loss per share (in thousands, except per share amounts):

<TABLE>
<CAPTION>
                                                    Year Ended December 31,
                                                       1997     1998      1999
- -------------------------------------------------------------------------------
<S>                                                 <C>      <C>      <C>
Basic and diluted:
Net loss applicable to common stockholders......... $(2,753) $(5,596) $(12,608)
                                                    =======  =======  ========
Weighted average shares of common stock
   outstanding.....................................  12,842   13,086    13,151
                                                    =======  =======  ========
Basic and diluted net loss per share...............  $(0.21)  $(0.43)   $(0.96)
                                                    =======  =======  ========
Pro forma basic and diluted:
Net loss applicable to common stockholders.........                   $(12,608)
Add back: Accretion of discount on convertible
   preferred stock.................................      --       --     3,406
                                                                      --------
Pro forma net loss applicable to common
   stockholders....................................                   $ (9,202)
                                                                      ========
Shares used above..................................                     13,151
Pro forma adjustment to reflect weighted average
   effect of assumed conversion of preferred
   stock...........................................                      7,378
                                                                      --------
Shares used in computing pro forma basic and
   diluted net loss per share......................                     20,529
                                                                      ========
Basic and diluted pro forma net loss per share.....                     $(0.45)
                                                                      ========
</TABLE>

The Company has excluded all convertible preferred stock, outstanding stock
options, outstanding warrants to purchase stock and shares subject to
repurchase from the calculation of diluted loss per common share because all
such securities are antidilutive for all applicable periods presented. The
total number of shares excluded from the calculations of diluted net loss per
share, prior to application of the treasury stock method for options, was
6,213,330, 9,863,318 and 12,741,278 for the years ended December 31, 1997, 1998
and 1999, respectively. Such securities, had they been dilutive, would have
been included in the computations of diluted net loss per share. See Note 4 for
further information on these securities.

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

F-10
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)


Unaudited pro forma stockholders' equity
The unaudited pro forma stockholders' equity information at December 31, 1999
reflects the conversion of the convertible preferred stock.

Recently issued accounting standards
In June 1998, the FASB issued SFAS No. 133, Accounting for Derivative
Instruments and Hedging Activities, as amended by SFAS No. 137, which is
effective for fiscal years beginning after June 15, 2000. This statement
requires companies to record derivatives on the balance sheet as assets or
liabilities measured at fair value. Gains or losses resulting from changes in
the values of those derivatives would be accounted for depending on the use of
the derivative and whether it qualifies for hedge accounting. SFAS No. 133 will
be effective for the Company's financial statements for the year ending
December 31, 2001. Management believes that this statement will not have a
material impact on the Company's financial position or results of operations.

In March 1999, the FASB issued an exposure draft entitled Accounting for
Certain Transactions involving Stock Compensation, which is a proposed
interpretation of APB Opinion No. 25. However, the exposure draft has not been
finalized. Once finalized and issued, the current accounting practices for
transactions involving stock compensation may need to change and such changes
could affect the Company's future operating results.

In December 1999, the Securities and Exchange Commission staff released Staff
Accounting Bulletin No. 101, Revenue Recognition in Financial Statements (SAB
No. 101), which provides guidance on the recognition, presentation and
disclosure of revenue in financial statements. The application of SAB No. 101
did not have a material impact on the financial statements of the Company.

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

3. Property and equipment

Property and equipment consisted of the following at December 31 (in
thousands):

<TABLE>
<CAPTION>
                                                                   1998    1999
- --------------------------------------------------------------------------------
<S>                                                              <C>     <C>
Laboratory equipment............................................   $783  $1,180
Computer equipment..............................................    128     264
Leasehold improvements..........................................    229     609
Purchased software and intangibles..............................     56     123
Furniture and fixtures..........................................     87     192
                                                                 ------  ------
                                                                  1,283   2,368
Less accumulated amortization and depreciation..................   (484)   (999)
                                                                 ------  ------
                                                                   $799  $1,369
                                                                 ======  ======
</TABLE>

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

                                                                            F-11
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)


4. Stockholders' equity

Series A Preferred Stock
A total of 457,250 shares of Series A Preferred Stock ("Series A Stock") were
issued in 1995 and 1996 at $2.00 per share. The Series A Stock does not
currently pay a dividend but is entitled to receive a dividend on a pro rata
basis if any dividend is paid to holders of the Common Stock. The Series A
Stock is entitled to one vote on all matters in which shares of Common Stock
are entitled to vote except in certain circumstances under the Delaware General
Corporation Law ("DGCL") where the holders are entitled to vote as a class.
Each share of Series A Stock is convertible at the option of the holder into
2.04 shares of Common Stock subject to adjustment to protect against dilution,
and has a preference in liquidation of $2.00.

With at least 30 days notice to each holder, the Company may, at its option,
redeem all but not part of the Series A Stock. All outstanding shares of Series
A Stock are subject to automatic conversion into fully paid and nonassessable
shares of Common Stock by the Company at $2.00 per share of Common Stock, on
the date that a registration statement registering any shares of Common Stock
under the Securities Act is declared effective by the Securities Exchange
Commission.

Series B Preferred Stock
A total of 150,000 shares of Series B Preferred Stock ("Series B Stock") were
issued in 1997 at $40.00 per share. The Series B Stock does not currently pay a
dividend but is entitled to receive a dividend on a pro rata basis if any
dividend is paid to the holders of the Common Stock. The Series B Stock is
entitled to ten votes on all matters in which shares of Common Stock are
entitled to vote except in certain circumstances under the DGCL where the
holders are entitled to vote as a class. Each share of Series B Stock is
convertible at the option of the holder into 20.4 shares of Common Stock,
subject to adjustment to protect against dilution, and has a preference in
liquidation of $40.00.

The Company may at its option, with not less than 30 and not more than 60 days
notice, redeem all but not part of the Series B Stock for $40.00 per share. All
outstanding shares of Series B Stock are subject to automatic conversion into
fully paid and nonassessable shares of Common Stock by the Company at $4.00 per
share of Common Stock, on the date that a registration statement registering
any shares of Common Stock under the Securities Act is declared effective by
the Securities Exchange Commission.

Series C Preferred Stock
A total of 151,571 shares of Series C Preferred Stock ("Series C Stock") were
issued in 1998 at $80.00 per share. The Series C Stock does not currently pay a
dividend but is entitled to receive a dividend on a pro rata basis if any
dividend is paid to holders of the Common Stock. The Series C Stock is entitled
to ten votes on all matters in which shares of Common Stock are entitled to
vote except in certain circumstances under the DGCL where the holders are
entitled to vote as a class. Each share of Series C Stock is convertible at the
option of the holder into 20.4 shares of Common Stock subject to adjustment to
protect against dilution, and has a preference in liquidation of $80.00.

The Company may, at its option, with not less than 30 and not more than 60 days
notice, redeem all but not part of the Series C Stock for $80.00 per share. All
outstanding shares of Series C Stock are subject to automatic conversion into
fully paid and nonassessable shares of Common Stock by the Company at $8.00 per
share of common stock, on the date that a registration statement registering
any shares of Common Stock under the Securities Act is declared effective by
the Securities and Exchange Commission.

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

F-12
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)


Series D Preferred Stock
A total of 57,538 shares of Series D Preferred Stock ("Series D Stock") were
issued in 1999 at $120.00 per share. The Series D Stock does not currently pay
a dividend but is entitled to receive a dividend on a pro rata basis if any
dividend is paid to holders of the Common Stock. The Series D Stock is entitled
to ten votes on all matters in which shares of Common Stock are entitled to
vote except in certain circumstances under the DGCL where the holders are
entitled to vote as a class. Each share of Series D Stock is convertible at the
option of the holder into 20.4 shares of Common Stock subject to adjustment to
protect against dilution, and has a preference in liquidation of $120.00.

The Company may, at its option, with not less than 30 and not more than 60 days
notice, redeem all but not part of the Series D Stock for $120.00 per share.
All outstanding shares of Series D Stock are subject to automatic conversion
into fully paid and nonassessable shares of Common Stock by the Company at
$12.00 per share of common stock, on the date that a registration statement
registering any shares of Common Stock under the Securities Act is declared
effective by the Securities and Exchange Commission.

Series E Preferred Stock
A total of 25,000 shares of Series E Preferred Stock ("Series E Stock") were
issued in 1999 at $120.00 per share. The Series E Stock does not currently pay
a dividend but is entitled to receive a dividend on a pro rata basis if any
dividend is paid to holders of the Common Stock. The Series E Stock is entitled
to ten votes on all matters in which shares of Common Stock are entitled to
vote except in certain circumstances under the DGCL where the holders are
entitled to vote as a class. Each share of Series E Stock is convertible at the
option of the holder into 20.4 shares of Common Stock subject to adjustment to
protect against dilution, and has a preference in liquidation of $120.00.

The Company may, at its option, with not less than 30 and not more than 60 days
notice, redeem all but not part of the Series C Stock for $120.00 per share.
All outstanding shares of Series E Stock are subject to automatic conversion
into fully paid and nonassessable shares of Common Stock by the Company at
$12.00 per share of common stock, on the date that a registration statement
registering any shares of Common Stock under the Securities Act is declared
effective by the Securities and Exchange Commission.

Discount on Convertible Preferred Stock

The Company recorded a beneficial conversion feature pursuant to EITF 98-5 for
certain shares of Series D Stock issued in November 1999 and the shares of
Series E Stock issued in December 1999. The beneficial conversion feature was
calculated as the difference between the conversion price and the fair value of
the Common Stock into which the preferred stock is convertible. The Company
recorded a discount of $406,000 for Series D Stock issued in November 1999 and
$3,000,000 for Series E Stock issued in December 1999. The total discount of
$3,406,000 was immediately accreted as a preferred stock dividend as the Series
D Stock and the Series E Stock were immediately convertible upon issuance.

Common Stock
At December 31, 1999, there were 13,167,754 shares of Common Stock issued and
outstanding. In addition, approximately 13,344,749 shares were reserved for
future issuance upon exercise of stock options and warrants and upon conversion
of convertible securities.

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

                                                                            F-13
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)


Warrants to purchase Common Stock
In conjunction with the sale of the Series B Stock, the Company issued warrants
to purchase an aggregate of 535,500 shares of Common Stock at an exercise price
of $1.96 per share. The warrants may be exercised, in whole or in part, at any
time prior to April 3, 2002. (See also Note 8.)

Stock option plan
Under the Company's Stock Option Plan, which was amended in May 1998 (the
"Plan"), options to purchase up to 4,080,000 shares of the Company's Common
Stock may be granted to employees, officers, non-employee directors and
advisors of the Company. The Plan is administered by the Stock Option Committee
of the Board of Directors which has the authority to determine the terms and
conditions under which options will be granted, including the number of shares,
option price, vesting schedule and term. Under certain circumstances, the
Company may repurchase previously granted options or shares issued upon the
exercise of a previously granted option.

Since inception, the Company has granted options to employees at estimated fair
market value on the date of grant. Employee options generally vest one-third on
each of the first, second and third anniversary dates from the date of grant
and have a term of five years.

In 1997, the Company granted a fully vested option to purchase 38,250 shares of
the Company's Common Stock to a consulting firm at an exercise price of $1.96
per share that expires on January 31, 2002. The Company granted an additional
369,750 options to this consulting firm with vesting based on the achievement
of identified milestones. No amount was allocated to the value of these options
as such amounts were insignificant. In 1999, the consulting firm surrendered
all the options in exchange for issuance by the Company of a fully vested
option to purchase 102,000 shares of the Company's Common Stock at an exercise
price of $1.96 per share. The Company recorded, in selling, general and
administrative expenses, stock compensation in the amount of approximately
$433,000 in connection with the issuance of stock options to the consulting
firm.

The Company recorded total deferred stock compensation of $1,730,000 in
connection with certain stock options granted during the year ended December
31, 1999 including stock options granted to a consultant as described in the
preceding paragraph. The amount represents the difference between the exercise
price of stock option grants for 218,481 shares of common stock and the deemed
fair value of the Company's common stock at the time of such grants which
ranged from $1.96 to $5.88 per share and $3.92 to $15.30 per share,
respectively. Such amount is being amortized over the vesting periods of the
applicable options resulting in amortization of $1,263,000 for the year ended
December 31, 1999.

Pro forma information regarding net loss is required by Statement 123, and has
been determined as if the Company had accounted for its employee stock options
under the minimum value method of that Statement. The minimum value for these
options was estimated at the date of grant using a minimum value option pricing
model with the following assumptions for 1997, 1998 and 1999; volatility of 0%;
risk free interest rate of 6%; expected life of the options of 5 years; and an
expected dividend yield of 0%.

For purposes of pro forma disclosures, the estimated fair value of the options
is expensed over the options' vesting periods. The Company's pro forma
information is as follows (in thousands):

<TABLE>
<CAPTION>
                                                        1997     1998     1999
- -------------------------------------------------------------------------------
<S>                                                  <C>      <C>      <C>
Net loss as reported................................ $(2,753) $(5,596) $(9,202)
Pro forma net loss..................................  (2,800)  (5,753)  (9,468)
Diluted net loss per share as reported..............   (0.21)   (0.43)   (0.70)
Pro forma diluted net loss per share................   (0.22)   (0.44)   (0.72)
</TABLE>

The weighted average grant date fair value of options granted was $0.51, $0.84
and $1.04 for 1997, 1998 and 1999, respectively.

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

F-14
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)


A summary of the changes in Common Stock options is as follows:

<TABLE>
<CAPTION>
                                                                       Weighted
                                                              Range of  average
                                                              exercise exercise
                                                   Shares       prices    price
- -------------------------------------------------------------------------------
<S>                                             <C>        <C>         <C>
Options outstanding, December 31, 1996.........   405,960        $0.49    $0.49
 Granted....................................... 1,279,080        $1.96    $1.96
 Exercised.....................................        --           --       --
 Surrendered...................................        --           --       --
                                                ---------  -----------    -----
Options outstanding, December 31, 1997......... 1,685,040  $0.49-$1.96    $1.61
 Granted.......................................   574,260  $2.94-$3.92    $3.52
 Exercised.....................................    (5,439)       $0.49    $0.49
 Surrendered...................................   (10,881) $0.49-$2.94    $1.96
                                                ---------  -----------    -----
Options outstanding, December 31, 1998......... 2,242,980  $0.49-$3.92    $2.10
 Granted....................................... 1,666,884  $1.96-$5.88    $4.03
 Exercised.....................................   (33,905) $0.49-$1.96    $1.38
 Surrendered...................................  (438,600)       $1.96    $1.96
                                                ---------  -----------    -----
Options outstanding, December 31, 1999......... 3,437,359  $0.49-$5.88    $3.06
                                                =========
</TABLE>

The following table summarizes information about options outstanding at
December 31, 1999:

<TABLE>
<CAPTION>
                      Options outstanding                Options exercisable
                      Weighted average       Weighted      Number       Weighted
Exercise       Number        remaining        average exercisable        average
price     outstanding contractual life exercise price  and vested exercise price
- --------------------------------------------------------------------------------
<S>       <C>         <C>              <C>            <C>         <C>
$0.49         384,295             1.16          $0.49     323,095          $0.49
 1.96         918,000             2.80           1.96     690,169           1.96
 2.94         330,480             3.16           2.94     110,148           2.94
 3.92       1,555,500             4.29           3.92     266,891           3.92
 5.88         249,084             4.21           5.88      46,783           5.88
            ---------                                   ---------
            3,437,359                                   1,437,086
            =========                                   =========
</TABLE>

5. Income taxes

As of December 31, 1999, the Company had federal net operating loss
carryforwards of approximately $17,077,000 and research and development credit
carryforwards of approximately $572,000 that will begin to expire in 2010 if
not utilized.

The Tax Reform Act of 1986 imposes substantial restrictions on the utilization
of net operating losses and tax credits in the event of an "ownership change"
of a corporation. The Company's utilization of the net operating losses will be
subject to an annual limitation due to an "ownership change" resulting from the
sales of private equity securities. The annual limitations will result in the
expiration of no more than $750,000 of net operating losses before utilization.

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

                                                                            F-15
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)


Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amount of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. Significant components
of the Company's deferred tax liabilities and assets as of December 31 are as
follows (in thousands):

<TABLE>
<CAPTION>
                                                                   1998    1999
- --------------------------------------------------------------------------------
<S>                                                             <C>      <C>
Deferred tax assets:
 Deferred revenue..............................................     $--    $267
 Depreciable assets............................................      --     147
 Accrued expenses..............................................       5      40
 Net operating loss and credit carryforwards...................   4,080   6,855
 Start-up and organization costs...............................      17      11
 Stock compensation............................................      --     467
                                                                -------  ------
Total deferred tax assets......................................   4,102   7,787
 Valuation allowance for deferred tax assets...................  (4,086) (7,764)
                                                                -------  ------
Net deferred taxes.............................................      16      23
Deferred tax liabilities:
 Prepaid expenses..............................................     (16)    (23)
                                                                -------  ------
Total deferred tax liabilities.................................     (16)    (23)
                                                                -------  ------
Net deferred taxes.............................................     $--     $--
                                                                =======  ======
</TABLE>

The Company has established a valuation allowance equal to the net deferred tax
assets due to uncertainties regarding the realization of deferred tax assets
based on the Company's lack of earnings history. The valuation allowance
increased by approximately $2,161,000 and $3,678,000 during 1998 and 1999,
respectively.

The Company's provision for income taxes differs from the expected tax benefit
amount computed by applying the statutory federal income tax rate of 34% to
income before income taxes as a result of the following:

<TABLE>
<CAPTION>
                                                            Year Ended
                                                           December 31,
                                                          1997    1998    1999
- --------------------------------------------------------------------------------
<S>                                                      <C>     <C>     <C>
Statutory tax rate...................................... (34.0)% (34.0)% (34.0)%
State taxes, net of federal benefit.....................  (3.0)   (3.0)   (3.0)
Nondeductible expenses..................................    --     1.0     0.1
R&D credit generated....................................  (5.6)   (2.6)   (2.7)
Other...................................................    --      --    (0.6)
Valuation allowance.....................................  42.6    38.6    40.2
                                                         -----   -----   -----
                                                            -- %    -- %    -- %
                                                         =====   =====   =====
</TABLE>

6. Employee benefit plans

Beginning January 1, 1998, the Company instituted a Savings Incentive Match
Plan for Employees ("SIMPLE") under Section 408(p) of the Internal Revenue
Code. Each employee of the Company who received at least $5,000 of compensation
during the year from the Company was eligible to contribute

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

F-16
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)

up to $6,000 annually. The Company matches such contributions on a dollar-for-
dollar basis up to a maximum of 3% of the employee's gross salary compensation.
All employee and employer contributions are immediately vested. The Company's
contributions totaled approximately $40,000 in 1998 and $92,000 in 1999.

7. Commitments

Lease arrangements

The Company has various operating leases related primarily to office
facilities. Rental expense for these operating leases for the years 1997, 1998
and 1999 totaled approximately $105,000, $152,000 and $399,000, respectively.
Minimum annual rental commitments as of December 31, 1999 under noncancelable
leases for each of the next five years and in the aggregate are as follows (in
thousands):

<TABLE>
<S>                                                                         <C>
2000....................................................................... $327
2001.......................................................................  304
2002.......................................................................   74
2003.......................................................................   --
2004.......................................................................   --
Thereafter.................................................................   --
                                                                            ----
Total...................................................................... $705
                                                                            ====
</TABLE>

Legal proceedings

As a result of a procedural omission by the Company's prior patent counsel, the
Company is unable to obtain a patent in Japan and certain other countries for
the Company's method of "real time" detection and quantification of multiple
analytes from a single sample. The Company has filed a lawsuit alleging
negligence on the part of its prior patent counsel in this matter and seeking
to recover the damages believed to result from the lack of this patent
protection in Japan and certain other countries. At this time, management
cannot predict whether this lawsuit will be successful and, if so, the amount
of any damages that may be recovered.

8. Related party transactions

The Company purchased certain office and laboratory equipment from Inland Labs
on January 1, 1998 for $769,766, which was based on the net book value of the
assets acquired by Inland Labs prior to July 1, 1995, and the cost of assets
acquired by Inland Labs subsequent to June 30, 1995. Dr. Chandler was paid
$208,782 in cash and was issued 286,102 shares of the Company's Common Stock. A
committee of outside directors determined that the transaction was fair and in
the best interest of the Company and its stockholders.

In 1997, the Company paid $136,000 to a stockholder and Director of the Company
for consulting services provided in conjunction with the development of the
Company's FlowMetrixTM System and the Luminex 100 diagnostic instrument.

In conjunction with the issuance of the Series B Preferred Stock in 1997, the
Company made cash payments totaling approximately $266,000 and issued warrants
to purchase 535,500 shares of

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

                                                                            F-17
<PAGE>

Luminex Corporation

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

NOTES TO FINANCIAL STATEMENTS (continued)

Common Stock to the predecessor of Loewenbaum & Company, Incorporated
("Loewenbaum"), which acted as the placement agent for the Series B Preferred
Stock. G. Walter Loewenbaum is a major stockholder and Director of Luminex and
is Chairman and Chief Executive Officer of Loewenbaum and held such offices
with its predecessor. The cash and warrants were paid to Loewenbaum's
predecessor as the placement fee for the Series B Preferred Stock. The warrants
may be exercised in whole or in part, at any time prior to April 3, 2002 at
$1.96 per share.

In conjunction with the issuance of the Series C Preferred Stock in 1998, the
Company made cash payments totaling approximately $849,000 to Loewenbaum, which
acted as the placement agent for the Series C Preferred Stock. G. Walter
Loewenbaum is a major stockholder and Director of Luminex and is Chairman and
Chief Executive Officer of Loewenbaum. The cash was paid to Loewenbaum as the
placement fee for the Series C Preferred Stock.

On June 1, 1999 the Company entered into a consulting agreement with a director
of Luminex for consulting services. In consideration for those services, the
Company paid the director $5,833 per month. On November 1, 1999, the Company
amended that agreement to increase the level of consulting services and to
increase the consulting fee to $11,666 per month. In addition, the Company
issued stock options for the purchase of 51,000 shares of the Company's common
stock to this Director of the Company. The Company recorded in sales, general
and administrative expense deferred stock compensation in the amount of
$609,450 in connection with such transaction of which approximately $332,000
was amortized during the year.

On September 1, 1997, seven outside directors of Luminex were each granted
fully vested options to purchase 10,200 shares of common stock at an exercise
price of $1.96 per share, and one outside director of Luminex was granted fully
vested options to purchase 61,200 shares of common stock at an exercise price
of $1.96 per share.

On May 20, 1999, six outside directors of Luminex were each granted fully
vested options to purchase 30,600 shares of common stock at an exercise price
of $3.92 per share.

In December 1999, the Company issued 51,000 shares of Series E convertible
preferred stock for an aggregate price of $3,000,000 to Koerner Capital
Corporation, of which John E. Koerner III, one of the Company's directors is
the sole stockholder.

9. Joint venture research arrangement

In October 1998, the Company, along with a joint venture partner, was granted a
special assistance award by the National Institute of Standards and Technology
to conduct liquid array technology development. In September 1999, the Company
and its joint venture partner suspended all joint venture activities. During
the year, the Company incurred expenses related to liquid array development
activities totaling approximately $600,000 and recognized grant revenues of
approximately $506,000.

10. Subsequent event

On March 6, 2000, the number of authorized shares of common stock was increased
from 25,000,000 to 50,000,000, with the total number of authorized shares of
common stock to be increased to 200,000,000 upon completion of an initial
public offering. Additionally, on March 9, 2000, the Board of Directors of the
Company approved a 2.04-for-1 stock split of common stock in the form of a
stock dividend. All common stock and per share information has been adjusted to
reflect the stock dividend as if such stock dividend had taken place at the
inception of the Company.

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

F-18
<PAGE>


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

                         [LOGO OF LUMINEX APPEARS HERE]

- --------------------------------------------------------------------------------
<PAGE>

                                    Part II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13. Other Expenses of Issuance and Distribution

The following is an itemized statement of the amounts of all expenses payable
by the Registrant in connection with the registration of the common stock
offered hereby (estimated except for the Registration Fee, NASD Filing Fee and
Nasdaq National Market listing fee), other than underwriting discounts and
commissions:

<TABLE>
<S>                                                                     <C>
Registration Fee--Securities and Exchange Commission..................  $ 26,400
NASD Filing Fee.......................................................    10,500
Nasdaq National Market listing fee....................................    95,000
Blue Sky fees and expenses............................................     5,000
Accountants' fees and expenses........................................   180,000
Legal fees and expenses...............................................   250,000
Printing and engraving expenses.......................................   125,000
Transfer agent and registrar fees.....................................     3,600
Miscellaneous.........................................................     4,500
                                                                        --------
  Total...............................................................  $700,000
                                                                        ========
</TABLE>

ITEM 14. Indemnification of Directors and Officers

Pursuant to Sections 102(b)(7) and 145 of the Delaware General Corporation Law,
our Restated Certificate of Incorporation and Amended and Restated Bylaws
include provisions eliminating or limiting the personal liability of the
members of our board of directors to our company and our stockholders for
monetary damages for breach of fiduciary duty as a director. This does not
apply for any breach of a director's duty of loyalty to our company or our
stockholders, for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of the law, for paying an
unlawful dividend or approving an illegal stock repurchase, or for any
transaction from which a director derived an improper personal benefit.

Our Restated Certificate of Incorporation and Amended and Restated Bylaws also
provide that we have the power to indemnify any person who was or is a party or
is threatened to be made a party to any threatened, pending or completed
action, suit or proceeding (other than an action by or in the right of our
company) by reason of the fact that the person is or was a director, officer,
employee or agent of any corporation, partnership, joint venture, trust or
other enterprise, against any and all expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement and reasonably incurred in
connection with such action, suit or proceeding. Our power to indemnify applies
only if the person acted in good faith and in a manner he reasonably believed
to be in or not opposed to the best interests of our corporation, and with
respect to any criminal action or proceeding, had no reasonable cause to
believe the person's conduct was unlawful.

In the case of an action by or in the right of our company, no indemnification
may be made with respect to any claim, issue or matter as to which such person
shall have been adjudged to be liable to us unless and only to the extent that
the court in which such action or suit was brought shall determine that despite
the adjudication of liability such person is fairly and reasonably entitled to
indemnity for such expenses which the court shall deem proper. To the extent a
director or officer of our company has been successful in the defense of any
action, suit or proceeding referred to above or in the defense of any claim,
issue or matter therein, he shall be indemnified against expenses (including
attorney's fees) actually and reasonably incurred by him in connection
therewith.

                                                                            II-1
<PAGE>

We have the power to purchase and maintain insurance on behalf of any person
covering any liability incurred by such person in his capacity as a director,
officer, employee or agent of our company, or arising out of his status as
such, whether or not we would have the power to indemnify him against such
liability.

The foregoing summaries are necessarily subject to the complete text of the
statute, Amended and Restated Bylaws and Restated Certificate of Incorporation
referred to above and are qualified in their entirety by reference thereto.

ITEM 15. Recent Sales of Unregistered Securities

A. In the three years preceding the filing of this registration statement, the
   Registrant from time to time has granted stock options to employees and
   consultants in reliance upon exemption from registration pursuant to either
   (1) Section 4(2) of the Securities Act of 1933 or (2) Rule 701 promulgated
   under the Securities Act of 1933. The following table sets forth certain
   information regarding such grants:

<TABLE>
<CAPTION>
                                                             Number     Exercise
                                                          of shares       prices
- --------------------------------------------------------------------------------
<S>                                                       <C>       <C>
January 1, 1997 to December 31, 1997..................... 1,279,080        $1.96
January 1, 1998 to December 31, 1998.....................   574,260  $2.94-$3.92
January 1, 1999 to December 31, 1999..................... 1,666,884  $1.96-$5.88
January 1, 2000 to March 21, 2000........................ 1,033,500 $5.88-$18.00
</TABLE>

For additional information concerning these transactions, please see
"Management -- Employee benefit plans" in the prospectus included in this
registration statement.

B. Set forth in chronological order is information regarding all securities
   sold by the Registrant in the three years preceding the filing of this
   registration statement.

  (1) Since January 1, 1997, the Registrant has granted to employees,
      directors and consultants options to purchase an aggregate of 4,553,724
      shares of Common Stock under its 1996 Stock Option Plan and 2000 Long-
      Term Incentive Plan at a weighted average exercise price of $6.11.

  (2) On April 2, 1997, the Registrant issued a warrant to purchase 535,500
      shares of common stock to Southcoast Capital Corporation or its
      permitted assigns for an aggregate purchase price of $1,050,000.

  (3) In April 1997, the Registrant issued 150,000 shares of its Series B
      convertible preferred stock to individuals and entities for an
      aggregate purchase price of $6,000,000.

  (4) In July 1999, the Registrant issued 151,571 shares of its Series C
      convertible preferred stock to individuals and entities for an
      aggregate purchase price of $12,125,680.

  (5) In December 1999, the Registrant issued 57,538 shares of its Series D
      convertible preferred stock to individuals and entities for an
      aggregate price of $6,904,560.

  (6) In December 1999, the Registrant issued 25,000 shares of our Series E
      convertible preferred stock to an entity for an aggregate purchase
      price of $3,000,000.

The issuances to employees, directors and consultants described in (1) were
deemed to be exempt from registration under Rule 701 promulgated under Section
3(b) of the Securities Act of 1933 as transactions by an issuer not involving a
public offering or transactions pursuant to compensatory benefit plans and
contracts relating to compensation. The sales described in (2) through (6) were
made only to "accredited investors" and were deemed to be exempt from
registration under the Securities Act of 1933 in reliance on Section 4(2) of
the Securities Act, or Regulation D promulgated thereunder.

II-2
<PAGE>

Other than the placement agent utilized in connection with sales of our Series
B and C preferred stock, no underwriters were involved in the foregoing sales
of securities. Each share of the Registrant's convertible preferred stock
listed above will convert automatically into 20.4 shares of the Registrant's
common stock upon the effectiveness of this registration statement.

ITEM 16. Exhibits and Financial Statement Schedules

(a)Exhibits

<TABLE>
<CAPTION>
 Exhibit
  Number Description
- -------------------------------------------------------------------------------
 <C>     <S>
  1.1    Form of Underwriting Agreement
  3.1++  Form of Restated Certificate of Incorporation of the Registrant
  3.2++  Amended and Restated Bylaws of the Registrant
  4.1    Form of Common Stock Certificate
  4.2++  Warrant for the Purchase of Shares of Common Stock dated as of April
         2, 1997 by and between the Registrant and Southcoast Capital
         Corporation.
  5.1++  Opinion of Thompson & Knight L.L.P.
 10.1++  1996 Stock Option Plan of the Registrant, as amended.
 10.2++  Form of Stock Option Agreement of the Registrant.
 10.3++  Form of Incentive Stock Option Agreement of the Registrant.
 10.4++  2000 Long-Term Incentive Plan of the Registrant.
 10.5++  Form of Stock Option Award Agreement of the Registrant.
 10.6++  Reserved
 10.7+++ Development and Supply Agreement dated as of March 19, 1999 by and
         between the Registrant and Bio-Rad Laboratories, Inc.
 10.8+++ Amendment to Development and Supply Agreement dated as of January 13,
         2000 by and between the Registrant and Bio-Rad Laboratories, Inc.
 10.9+++ Agreement for Electronic Manufacturing Services dated as of January 1,
         2000 by and between the Registrant and Sanmina Corporation.
 10.10++ Consultant Agreement dated as of June 1, 1999 by and between the
         Registrant and A. Sidney Alpert.
 10.11++ Amendment to Consultant Agreement dated as of November 1, 1999 by and
         between the Registrant and A. Sidney Alpert.
 10.12++ Standard Commercial Lease Agreement dated as of August 21, 1989 by and
         between the Registrant and Aetna Life Insurance Company, as amended,
         for facilities situated at 12112 Technology Boulevard, Austin, Texas
         78727.
 10.13++ Sublease Agreement dated as of December 20, 1999 by and between the
         Registrant and American Innovations, Ltd., for facilities situated at
         12112 Technology Boulevard, Austin, Texas 78727.
 10.14++ First Amendment to Sublease Agreement dated as of December 20, 1999 by
         and between the Registrant and American Innovations, Ltd., for
         facilities situated at 12112 Technology Boulevard, Austin, Texas
         78727.
 10.15++ Form of Employment Agreement between the Registrant and each of Mark B
         Chandler, Ph.D., Michael L. Bengtson, Ralph L. McDade, M.D., Van S.
         Chandler, Michael D. Spain, M.D., James L. Persky and Randel S.
         Marfin.
 23.1++  Consent of Thompson & Knight L.L.P. (included as part of Exhibit 5.1
         hereto)
 23.2    Consent of Independent Auditors
 24.1++  Power of Attorney (included on signature page of the Registration
         Statement hereto)
 24.2++  Power of Attorney of William L. Roper, M.D., M.P.H.
 27.1++  Financial Data Schedule
</TABLE>
- --------
*  To be filed by amendment.
+  Confidential treatment requested for certain portions of this Exhibit
   pursuant to Rule 406 promulgated under the Securities Act, which portions
   are omitted and filed separately with the Securities and Exchange
   Commission.
++ Previously filed.

                                                                            II-3
<PAGE>

(b)Financial Statement Schedules

None.

ITEM 17. Undertakings

The undersigned Registrant hereby undertakes to provide to the underwriters, at
the closing specified in the underwriting agreement, certificates in such
denominations and registered in such names as required by the underwriters to
permit prompt delivery to each purchaser.

Insofar as indemnification for liabilities arising under the Securities Act of
1933 may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the SEC such indemnification is against
public policy as expressed in the Act and is, therefore, unenforceable. In the
event that a claim for indemnification against such liabilities (other than the
payment by the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.

The undersigned Registrant hereby undertakes that:

  (1) For purposes of determining any liability under the Securities Act of
      1933, the information omitted from the form of prospectus filed as part
      of this registration statement in reliance upon Rule 430A and contained
      in a form of prospectus filed by the Registrant pursuant to Rule
      424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to
      be part of this registration statement as of the time it was declared
      effective.

  (2) For the purpose of determining any liability under the Securities Act
      of 1933, each post-effective amendment that contains a form of
      prospectus shall be deemed to be a new registration statement relating
      to the securities offered therein, and the offering of such securities
      at the time shall be deemed to be the initial bona fide offering
      thereof.


II-4
<PAGE>

                                   SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant has
duly caused this Amendment No. 2 to Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Austin,
State of Texas, on March 23, 2000.

                                          Luminex Corporation

                                            /s/ Mark B. Chandler, Ph.D.
                                          By___________________________________
                                                  Mark B. Chandler, Ph.D.
                                                  Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, as amended, this
Amendment No. 2 to Registration Statement has been signed by the following
persons on March 23, 2000 in the capacities indicated

<TABLE>
<CAPTION>
             SIGNATURE                           TITLE                    DATE
             ---------                           -----                    ----


<S>                                  <C>                           <C>
   /s/ Mark B. Chandler, Ph.D.       Chairman of the Board and       March 23, 2000
____________________________________ Chief Executive Officer
      Mark B. Chandler, Ph.D.        (Principal Executive
                                     Officer)


                 *                   Vice President, Treasurer
____________________________________ and Chief Financial Officer
          James L. Persky            (Principal Financial
                                     Officer)
                 *                   Controller (Principal
____________________________________ Accounting Officer)
         Harriss T. Currie

                 *                   Director
____________________________________
        G. Walter Loewenbaum

                 *                   Director
____________________________________
          A. Sidney Alpert

                 *                   Director
____________________________________
          Robert J. Cresci

                 *                   Director
____________________________________
         Laurence E. Hirsch
</TABLE>

                                                                            II-5
<PAGE>

<TABLE>
<CAPTION>
             Signature                           Title                    Date
             ---------                           -----                    ----


<S>                                  <C>                           <C>
                 *                   Director
____________________________________
            Jim D. Kever


                 *                   Director
____________________________________
         Fred C. Goad, Jr.

                 *                   Director
____________________________________
        John E. Koerner, III

                 *                   Director
____________________________________
   William L. Roper, M.D., M.P.H.



*By:/s/ Mark B. Chandler, Ph.D.
    ________________________________
    Mark B. Chandler, Ph.D.
    Attorney-in-fact
</TABLE>


II-6
<PAGE>

                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
 Exhibit
  Number Description
- -------------------------------------------------------------------------------
 <C>     <S>
  1.1    Form of Underwriting Agreement
  3.1++  Form of Restated Certificate of Incorporation of the Registrant
  3.2++  Amended and Restated Bylaws of the Registrant
  4.1    Form of Common Stock Certificate
  4.2++  Warrant for the Purchase of Shares of Common Stock dated as of April
         2, 1997 by and between the Registrant and Southcoast Capital
         Corporation.
  5.1++  Opinion of Thompson & Knight L.L.P.
 10.1++  1996 Stock Option Plan of the Registrant, as amended.
 10.2++  Form of Stock Option Agreement of the Registrant.
 10.3++  Form of Incentive Stock Option Agreement of the Registrant.
 10.4++  2000 Long-Term Incentive Plan of the Registrant.
 10.5++  Form of Stock Option Award Agreement of the Registrant.
 10.6++  Reserved
 10.7+++ Development and Supply Agreement dated as of March 19, 1999 by and
         between the Registrant and Bio-Rad Laboratories, Inc.
 10.8+++ Amendment to Development and Supply Agreement dated as of January 13,
         2000 by and between the Registrant and Bio-Rad Laboratories, Inc.
 10.9+++ Agreement for Electronic Manufacturing Services dated as of January 1,
         2000 by and between the Registrant and Sanmina Corporation.
 10.10++ Consultant Agreement dated as of June 1, 1999 by and between the
         Registrant and A. Sidney Alpert.
 10.11++ Amendment to Consultant Agreement dated as of November 1, 1999 by and
         between the Registrant and A. Sidney Alpert.
 10.12++ Standard Commercial Lease Agreement dated as of August 21, 1989 by and
         between the Registrant and Aetna Life Insurance Company, as amended,
         for facilities situated at 12112 Technology Boulevard, Austin, Texas
         78727.
 10.13++ Sublease Agreement dated as of December 20, 1999 by and between the
         Registrant and American Innovations, Ltd., for facilities situated at
         12112 Technology Boulevard, Austin, Texas 78727.
 10.14++ First Amendment to Sublease Agreement dated as of December 20, 1999 by
         and between the Registrant and American Innovations, Ltd., for
         facilities situated at 12112 Technology Boulevard, Austin, Texas
         78727.
 10.15++ Form of Employment Agreement between the Registrant and each of Mark
         B. Chandler, M.D., Michael L. Bengtson, Ralph L. McDade, M.D., Van S.
         Chandler, Michael D. Spain, M.D., James L. Persky and Randel S.
         Marfin.
 23.1++  Consent of Thompson & Knight L.L.P. (included as part of Exhibit 5.1
         hereto)
 23.2    Consent of Independent Auditors
 24.1++  Power of Attorney (included on signature page of the Registration
         Statement hereto)
 24.2++  Power of Attorney of William L. Roper, M.D., M.P.H.
 27.1++  Financial Data Schedule
</TABLE>
- --------
*  To be filed by amendment.
+  Confidential treatment requested for certain portions of this Exhibit
   pursuant to Rule 406 promulgated under the Securities Act, which portions
   are omitted and filed separately with the Securities and Exchange
   Commission.
++ Previously filed.

<PAGE>

                                                                     Exhibit 1.1

                              Luminex Corporation

                               _________ Shares

                                 Common Stock
                               ($.001 Par Value)


                                    FORM OF

                            UNDERWRITING AGREEMENT




                               ________ __, 2000
<PAGE>

                                    FORM OF

                            UNDERWRITING AGREEMENT

                               ________ __, 2000

Warburg Dillon Read LLC
Lehman Brothers Inc.
Dain Rauscher Incorporated
     As representatives of the several Underwriters
     named in Schedule A hereto

c/o Warburg Dillon Read LLC
299 Park Avenue
New York, New York 10171-0026

Ladies and Gentlemen:

          Luminex Corporation, a Delaware corporation (the Company), proposes to
issue and sell to the Underwriters named in Schedule A annexed hereto (the
Underwriters) an aggregate of _________ shares (the Firm Shares) of Common
Stock, $.001 par value per share (the Common Stock), of the Company.  In
addition, solely for the purpose of covering over-allotments, the Company
proposes to grant to the Underwriters the option to purchase from the Company up
to an additional ______ shares of Common Stock (the Additional Shares).  The
Firm Shares and the Additional Shares are hereinafter collectively sometimes
referred to as the Shares.  The Shares are described in the Prospectus which is
referred to below.

          The Company hereby acknowledges that in connection with the proposed
offering of the Shares, it has requested Warburg Dillon Read LLC (WDR) to
administer a directed share program (the Directed Share Program) under which up
to ______ shares of the Firm Shares to be purchased by you (the Reserved Shares)
shall be reserved for sale by you at the initial public offering price to the
Company's officers, directors, employees, and consultants and others having a
relationship with the Company (the Directed Share Participants) as part of the
distribution of the Shares by the Underwriters, subject to the terms of this
Agreement, the applicable rules, regulations and interpretations of the National
Association of Securities Dealers, Inc. and all other applicable laws, rules and
regulations. The number of Shares available for sale to the general public will
be reduced to the extent that

                                       1
<PAGE>

Directed Share Participants purchase Reserved Shares. You may offer any Reserved
Shares not purchased by Directed Share Participants to the general public on the
same basis as the other Shares being issued and sold hereunder. The Company has
supplied WDR with the names, addresses and telephone numbers of the individuals
or other entities which the Company has designated to be participants in the
Directed Share Program. It is understood that any number of those designated to
participate in the Directed Share Program may decline to do so.

          The Company has filed, in accordance with the provisions of the
Securities Act of 1933, as amended, and the rules and regulations thereunder
(collectively called the Act), with the Securities and Exchange Commission (the
Commission) a registration statement on Form S-1 (File No. 333-96317) including
a prospectus, relating to the Shares.  The Company has furnished to you, for use
by the Underwriters and by dealers, copies of one or more preliminary
prospectuses (each thereof being herein called a Preliminary Prospectus)
relating to the Shares.  Except where the context otherwise requires, the
registration statement, as amended when it becomes effective, including all
documents filed as a part thereof, and including any information contained in a
prospectus subsequently filed with the Commission pursuant to Rule 424(b) under
the Act and deemed to be part of the registration statement at the time of
effectiveness pursuant to Rule 430(A) under the Act, and also including any
registration statement filed pursuant to Rule 462(b) under the Act, is herein
called the Registration Statement, and the prospectus, in the form filed by the
Company with the Commission pursuant to Rule 424(b) under the Act on or before
the second business day after the date hereof (or such earlier time as may be
required under the Act) or, if no such filing is required, the form of final
prospectus included in the Registration Statement at the time it became
effective, is herein called the Prospectus.

          The Company and the Underwriters agree as follows:

          1.   Sale and Purchase. Upon the basis of the representations and
               -----------------
warranties and subject to the terms and conditions herein set forth, the Company
agrees to sell to the respective Underwriters and each of the Underwriters,
severally and not jointly, agrees to purchase from the Company the aggregate
number of Firm Shares set forth opposite the name of such Underwriter in
Schedule A attached hereto in each case at a purchase price of $____ per Share.
The Company is advised by you that the Underwriters intend (i) to make a public
offering of their respective portions of the Firm Shares as soon after the
effective date of the Registration Statement as in your judgment is advisable
and (ii) initially to offer the Firm Shares upon the terms set forth in the
Prospectus. You may from time to time increase or decrease the public offering
price after the initial public offering to such extent as you may determine.

          In addition, the Company hereby grants to the several Underwriters the
option to purchase, and upon the basis of the representations and warranties and
subject to the terms and conditions herein set forth, the Underwriters shall
have the right to purchase, severally

                                      -2-
<PAGE>

and not jointly, from the Company, ratably in accordance with the number of Firm
Shares to be purchased by each of them, all or a portion of the Additional
Shares as may be necessary to cover over-allotments made in connection with the
offering of the Firm Shares, at the same purchase price per share to be paid by
the Underwriters to the Company for the Firm Shares. This option may be
exercised by you on behalf of the several Underwriters at any time and from time
to time on or before the thirtieth day following the date hereof, by written
notice to the Company. Such notice shall set forth the aggregate number of
Additional Shares as to which the option is being exercised, and the date and
time when the Additional Shares are to be delivered (such date and time being
herein referred to as the additional time of purchase); provided, however, that
                                                        --------  -------
the additional time of purchase shall not be earlier than the time of purchase
(as defined below) nor earlier than the second business day/1/ after the date on
which the option shall have been exercised nor later than the tenth business day
after the date on which the option shall have been exercised. The number of
Additional Shares to be sold to each Underwriter shall be the number which bears
the same proportion to the aggregate number of Additional Shares being purchased
as the number of Firm Shares set forth opposite the name of such Underwriter on
Schedule A hereto bears to the total number of Firm Shares (subject, in each
case, to such adjustment as you may determine to eliminate fractional shares).

          2.   Payment and Delivery. Payment of the purchase price for the Firm
               --------------------
Shares shall be made to the Company by Federal Funds wire transfer, against
delivery of the certificates for the Firm Shares to you through the facilities
of the Depository Trust Company (DTC) for the respective accounts of the
Underwriters. Such payment and delivery shall be made at 10:00 A.M., New York
City time, on _________ __, 2000 (unless another time shall be agreed to by you
and the Company or unless postponed in accordance with the provisions of Section
8 hereof). The time at which such payment and delivery are actually made is
hereinafter sometimes called the time of purchase. Certificates for the Firm
Shares shall be delivered to you in definitive form in such names and in such
denominations as you shall specify on the second business day preceding the time
of purchase. For the purpose of expediting the checking of the certificates for
the Firm Shares by you, the Company agrees to make such certificates available
to you for such purpose at least one full business day preceding the time of
purchase.

          Payment of the purchase price for the Additional Shares shall be made
at the additional time of purchase in the same manner and at the same office as
the payment for the Firm Shares.  Certificates for the Additional Shares shall
be delivered to you in definitive form in such names and in such denominations
as you shall specify no later than the second business day preceding the
additional time of purchase.  For the purpose of expediting the checking of the
certificates for the Additional Shares by you, the Company agrees to make

__________________

          /1/  As used herein "business day" shall mean a day on which the New
York Stock Exchange is open for trading.

                                      -3-
<PAGE>

such certificates available to you for such purpose at least one full business
day preceding the additional time of purchase.

          Deliveries of the documents described in Section 6 below with respect
to the purchase of the Shares shall be made at the offices of Dewey Ballantine
LLP, 1301 Avenue of the Americas, New York, New York at 9:00 a.m., New York
time, on the date of the closing of the purchase of the Firm Shares or the
Additional Shares, as the case may be.

          3.   Representations and Warranties. The Company represents and
               ------------------------------
warrants to each of the Underwriters that:

          (a)  the Company has not received, and has no notice of, any order of
     the Commission preventing or suspending the use of any Preliminary
     Prospectus, or instituting proceedings for that purpose, and each
     Preliminary Prospectus, at the time of filing thereof, conformed in all
     material respects to the requirements of the Act; and when the Registration
     Statement became or becomes effective, the Registration Statement and the
     Prospectus complied or will comply fully in all material respects with the
     provisions of the Act, and the Registration Statement did not or will not
     contain an untrue statement of a material fact or omit to state a material
     fact required to be stated therein or necessary to make the statements
     therein not misleading, and the Prospectus did not or will not contain an
     untrue statement of a material fact or omit to state a material fact
     required to be stated therein or necessary to make the statements therein,
     in light of the circumstances under which they were made, not misleading
     and the Prospectus, any Preliminary Prospectus and any supplement thereto
     or prospectus wrapper prepared in connection therewith, at their respective
     times of issuance and at the time of closing, complied and will comply in
     all material respects with any applicable laws or regulations of
     jurisdictions in which the Prospectus and such preliminary prospectus, as
     amended or supplemented, if applicable, are distributed in connection with
     the offer and sale of Reserved Shares, provided, however, that the Company
                                            --------  -------
     makes no warranty or representation with respect to any statement contained
     in the Registration Statement or the Prospectus in reliance upon and in
     conformity with information concerning the Underwriters and furnished in
     writing by or on behalf of any Underwriter through you to the Company
     expressly for use in the Registration Statement or the Prospectus; and the
     Company has not distributed directly or indirectly any offering material in
     connection with the offering or sale of the Shares other than the
     Registration Statement, the Preliminary Prospectus, the Prospectus or any
     other materials, if any, permitted by the Act;

          (b)  as of the date of this Agreement, the Company has authorized and
     outstanding capital stock as set forth under the heading entitled "Actual"
     in the section of the Registration Statement and the Prospectus entitled
     "Capitalization" and, as of the time of purchase, and assuming the receipt
     and application of the net proceeds as described under the section of the
     Registration Statement and the Prospectus entitled

                                      -4-
<PAGE>

     "Use of Proceeds," the Company shall have an authorized and outstanding
     capital stock as set forth under the heading entitled "Pro Forma As
     Adjusted" in the section of the Registration Statement and the Prospectus
     entitled "Capitalization"; all of the shares of capital stock will be duly
     and validly authorized and issued, fully paid and non-assessable, will have
     been issued in compliance with all federal and state securities laws and
     will not have been issued in violation of any preemptive right, resale
     right, right of first refusal or similar right;

          (c)  the Company has been duly organized and is validly existing as a
     corporation and is in good standing under the laws of the State of
     Delaware, with full power and authority to own, lease and operate its
     properties and conduct its business as described in the Registration
     Statement;

          (d)  the Company is duly qualified to do business as a foreign
     corporation and is in good standing in each jurisdiction in which the
     ownership or leasing of its properties or the conduct of its business
     requires such qualification, except where the failure to so qualify would
     not individually or in the aggregate have a material adverse effect on the
     business, prospects, properties, condition (financial or otherwise) or
     results of operation of the Company (a "Material Adverse Effect"); the
     Company does not have any subsidiaries (as defined in the Act); the Company
     does not own, directly or indirectly, any shares of stock or any other
     equity or long-term debt securities of any corporation or have any equity
     interest in any firm, partnership, limited liability company, joint
     venture, association or other entity except as set forth in the
     Registration Statement and the Prospectus; complete and correct copies of
     the certificate of incorporation and bylaws or other organizational
     documents of the Company and all amendments thereto have been delivered to
     you, and except as set forth in the exhibits to the Registration Statement
     no changes therein will be made subsequent to the date hereof and prior to
     the time of purchase or, if later, the additional time of purchase;

          (e)  the Company is not in breach of, or in default under (and no
     event has occurred which with notice, lapse of time, or both would result
     in any breach of, or constitute a default under), its charter or by-laws or
     other organizational documents or in the performance or observance of any
     obligation, agreement, covenant or condition contained in any indenture,
     mortgage, deed of trust, bank loan or credit agreement or other evidence of
     indebtedness, or any lease, contract or other agreement or instrument to
     which the Company is a party or by which it or any of its properties is
     bound the effect of which would individually or in the aggregate have a
     Material Adverse Effect, and the execution, delivery and performance of
     this Agreement, the issuance and sale of the Shares contemplated hereby and
     by the Registration Statement will not conflict with, or result in any
     breach of or constitute a default under (nor constitute any event which
     with notice, lapse of time, or both would result in any breach of, or
     constitute a

                                      -5-
<PAGE>

     default under), any provisions of the charter or by-laws or other
     organizational documents of the Company or under any provision of any
     license, permit, franchise, indenture, mortgage, deed of trust, bank loan
     or credit agreement or other evidence of indebtedness, or any lease,
     contract or other agreement or instrument to which the Company is a party
     or by which it or its properties may be bound or affected, or under any
     federal, state, local or foreign law, regulation or rule or any decree,
     judgment or order applicable to the Company the result of which would
     individually or in the aggregate have a Material Adverse Effect;

          (f)  this Agreement has been duly authorized, executed and delivered
     by the Company and is a legal, valid and binding agreement of the Company,
     enforceable in accordance with its terms;

          (g)  the capital stock of the Company, including the Shares, conforms
     in all material respects to the description thereof contained in the
     Registration Statement and Prospectus; the certificates for the Shares are
     in due and proper form; and the holders of the Shares will not be subject
     to personal liability by reason of being such holders;

          (h)  the Shares have been duly and validly authorized and, when issued
     and delivered against payment therefor as provided herein, will be duly and
     validly issued, fully paid and non-assessable;

          (i)  no approval, authorization, consent or order of or filing with
     any national, state or local governmental or regulatory commission, board,
     body, authority or agency is required in connection with the execution,
     delivery and performance by the Company of this Agreement, the issuance and
     sale of the Shares contemplated hereby and by the Registration Statement,
     other than registration of the Shares under the Act, which has been or will
     be effected by the Company, and any necessary qualification under the
     securities or blue sky laws of the various jurisdictions in which the
     Shares are being offered by the Underwriters or under the rules and
     regulations of the National Association of Securities Dealers, Inc. (NASD);

          (j)  except as set forth in the Registration Statement and the
     Prospectus: (i) no person has the right, contractual or otherwise, to cause
     the Company to issue to it, or register pursuant to the Act, any shares of
     capital stock or other equity interests; and (ii) no person has any
     preemptive rights, co-sale rights, rights of first refusal or other rights
     to purchase any shares of Common Stock of the Company;

          (k)  Ernst & Young LLP, whose report on the financial statements of
     the Company are filed with the Commission as part of the Registration
     Statement and Prospectus, are independent public accountants as required by
     the Act;

                                      -6-
<PAGE>

          (l)  the Company has all necessary licenses, permits, franchises,
     authorizations, consents and approvals, and made all necessary filings
     required under any federal, state, local or foreign law, regulation or
     rule, and has obtained all necessary authorizations, consents and approvals
     from other persons, in order to conduct its business, except such of the
     foregoing of which the failure to obtain or make, either individually or in
     the aggregate, would not have a Material Adverse Effect; the Company is not
     in violation of, or in default under, any such license, permit, franchise,
     authorization, consent or approval or any federal, state, local or foreign
     law, regulation or rule or any decree, order or judgment applicable to the
     Company, the effect of which could individually or in the aggregate have a
     Material Adverse Effect;

          (m)  all legal or governmental proceedings, all statutes and
     regulations and all contracts, leases or documents of a character required
     to be described in the Registration Statement or the Prospectus or to be
     filed as an exhibit to the Registration Statement have been so described or
     filed as required;

          (n)  there are no private or governmental actions, suits, claims,
     investigations or proceedings pending, threatened or, to the knowledge of
     the Company, contemplated, to which the Company or, to the knowledge of the
     Company, any of its officers is subject or of which any of its properties
     is subject, whether at law, in equity or before or by any federal, state,
     local or foreign governmental or regulatory commission, board, body,
     authority or agency;

          (o)  the audited financial statements of the Company included in the
     Registration Statement and the Prospectus present fairly the financial
     position and results of operations of the Company as of the dates and for
     the periods indicated; such financial statements have been prepared in
     conformity with generally accepted accounting principles applied on a
     consistent basis during the periods involved; the pro forma financial data
     included in the Registration Statement and the Prospectus comply as to form
     in all material respects with the applicable accounting requirements of
     Regulation S-X of the Securities Act, and the pro forma adjustments have
     been properly applied to the historical amounts in the compilation of those
     statements; and the other financial and statistical data set forth in the
     Registration Statement and the Prospectus are accurately presented and
     prepared on a basis consistent with such financial statements and the books
     and records of the Company;

          (p)  subsequent to the respective dates as of which information is
     given in the Registration Statement and the Prospectus, there has not been
     (i) any material adverse change, or any development involving a prospective
     material adverse change, in the business, properties, condition (financial
     or otherwise) or results of operations of the Company, (ii) any transaction
     which is material to the Company (except transactions in the ordinary
     course of business), (iii) the incurrence by the Company of

                                      -7-
<PAGE>

     any obligation, direct or contingent, and whether or not in the ordinary
     course of business, which is material to the Company, (iv) any change in
     the capital stock, other than conversion of preferred stock of the Company
     as contemplated by the Registration Statement and the Prospectus, or other
     equity interest or outstanding indebtedness of the Company or (v) any
     dividend or distribution of any kind declared, paid or made on the capital
     stock or other equity interest of the Company. The Company does not have
     any material contingent obligations which are not disclosed in the
     Registration Statement;

          (q)  the Company has obtained the agreement (each, a "Lock-Up
     Agreement") of each of its executive officers, directors and holders of at
     least 98.8% of its Common Stock and securities convertible into Common
     Stock not to sell, offer to sell, contract to sell, hypothecate, pledge,
     grant any option to sell or otherwise dispose of, directly or indirectly,
     any shares of Common Stock or securities convertible into or exchangeable
     or exercisable for Common Stock or warrants or other rights to purchase
     Common Stock for a period of 180 days after the date of the Prospectus
     without the prior written consent of WDR;

          (r)  the Company has good and marketable title to all property (real
     and personal) described in the Prospectus as being owned by it, free and
     clear of all liens, claims, security interests or other encumbrances except
     such as are described in the Registration Statement and the Prospectus and
     except as would not individually or in the aggregate have a Material
     Adverse Effect. All the property described in the Prospectus as being held
     under lease by the Company is held thereby under valid, subsisting and
     enforceable leases;

          (s)  the Company is insured by insurers of recognized financial
     responsibility against such losses and risks and in such amount as are
     customary in the business in which it is engaged; all policies of insurance
     insuring the Company or any of its businesses, assets, employees, officers
     and directors are in full force and effect, and the Company is in
     compliance with the terms of such policies in all material respects; there
     are no claims by the Company under any such policy or instrument as to
     which any insurance company is denying liability or defending under a
     reservation of rights clause;

          (t)  the Company has not either sent or received any notice of
     termination of any of the contracts or agreements referred to or described
     in, or filed as an exhibit to, the Registration Statement, and no such
     termination has been threatened by the Company or any other party to any
     such contract or agreement;

          (u)  all statistical and market-related data included in the
     Prospectus are based on or derived from sources that the Company believes
     to be reliable and accurate, and the Company has obtained the written
     consent to the use of such data from such sources to the extent required;

                                      -8-
<PAGE>

          (v)  neither the Company nor any of its affiliates has taken, directly
     or indirectly, any action designed to or which has constituted or which
     might reasonably be expected to cause or result, under the Securities
     Exchange Act of 1934, as amended, and the rules and regulations thereunder
     (collectively called the Exchange Act) or otherwise, in stabilization or
     manipulation of the price of any security of the Company to facilitate the
     sale or resale of the Shares;

          (w)  other than as set forth in the Prospectus, the Company will own,
     possess, license or have other rights to use all patents, trademarks,
     servicemarks, trade names, copyrights, trade secrets, information,
     proprietary rights and processes ("Intellectual Property") necessary for
     its business as described in the Prospectus (including the offer and sale
     of those products and services, both currently marketed and under
     development, described in the Prospectus), without, to the Company's
     knowledge, any conflict with or infringement of the interests of others,
     and has taken all reasonable steps necessary to secure interests in such
     Intellectual Property; except as disclosed in the Prospectus, the Company
     is not aware of outstanding options, licenses or agreements of any kind
     relating to the Intellectual Property of the Company which are required to
     be disclosed in the Prospectus, and, except as disclosed in the Prospectus
     the Company is not a party to or bound by any options, licenses or
     agreements with respect to the Intellectual Property of any other person or
     entity which are required to be disclosed in the Prospectus; none of the
     technology employed by the Company has been obtained or is being used by
     the Company in violation of any contractual obligation binding on the
     Company or any of its directors or executive officers or, to the Company's
     knowledge, any employees of the Company or otherwise in violation of the
     rights of any persons; except as disclosed in the Prospectus, the Company
     has not received any communications alleging that the Company has violated,
     infringed or conflicted with, or, by conducting its business as described
     in the Prospectus, would violate, infringe or conflict with any of the
     Intellectual Property of any other person or entity other than any such
     violation, infringement or conflict which would not individually or in the
     aggregate have a Material Adverse Effect;

          (x)  the Company has not sustained since the date of the latest
     audited financial statements included in the Prospectus any loss or
     interference with its business from fire, explosion, flood or other
     calamity, whether or not covered by insurance, or from any labor dispute or
     court or governmental action, order or decree, otherwise than as disclosed
     in the Prospectus or other than any loss or interference which individually
     or in the aggregate would not have a Material Adverse Effect;

          (y)  the Company has not violated any foreign, federal, state or local
     law or regulation relating to the protection of human health and safety,
     the environment or hazardous or toxic substances or wastes, pollutants or
     contaminants, nor any federal or state law relating to discrimination in
     the hiring, promotion or pay of employees nor

                                      -9-
<PAGE>

     any applicable federal or state wages and hours laws, nor any provisions of
     the Employee Retirement Income Security Act or the rules and regulations
     promulgated thereunder, which individually or in the aggregate might result
     in a Material Adverse Effect;

          (z) the Company maintains a system of internal accounting controls
     sufficient to provide reasonable assurances that (i) transactions are
     executed in accordance with management's general or specific authorization;
     (ii) transactions are recorded as necessary to permit preparation of
     financial statements in conformity with generally accepted accounting
     principles and to maintain accountability for assets; (iii) access to
     assets is permitted only in accordance with management's general or
     specific authorization; and (iv) the recorded accountability for assets is
     compared with existing assets at reasonable intervals and appropriate
     action is taken with respect to any differences;

          (aa) the Company has filed all federal, state, local and foreign tax
     returns and tax forms required to be filed. Such returns and forms are
     complete and correct in all material respects, and all taxes shown by such
     returns or otherwise assessed that are due or payable have been paid,
     except such taxes as are being contested in good faith and as to which
     adequate reserves have been provided. All payroll withholdings required to
     be made by the Company with respect to employees have been made. The
     charges, accruals and reserves on the books of the Company in respect of
     any tax liability for any year not finally determined are adequate to meet
     any assessments or reassessments for additional taxes. There have been no
     tax deficiencies asserted and, to the knowledge of the Company, no tax
     deficiency might be reasonably asserted or threatened against the Company
     that could individually or in the aggregate have a Material Adverse Effect;
     and

          (bb) the Company is not, and after the offering and sale of the
     Shares, will not be, an "investment company" or a "promoter," "principal
     underwriter" for or an entity "controlled" by an "investment company," as
     such terms are defined in the Investment Company Act of 1940, as amended
     (the "Investment Company Act").

          In addition, any certificate signed by any officer of the Company,
delivered to the Representatives or counsel for the Underwriters in connection
with the offering of the Shares shall be deemed to be a representation and
warranty by the Company, as to matters covered thereby, to each Underwriter.

                                     -10-
<PAGE>

          4.  Certain Covenants. The Company hereby agrees:
              -----------------

          (a)  to furnish such information as may be required and otherwise to
     cooperate in qualifying the Shares for offering and sale under the
     securities or blue sky laws of such states as you may designate and to
     maintain such qualifications in effect so long as required for the
     distribution of the Shares; provided that the Company shall not be required
     to qualify as a foreign corporation or to consent to the service of process
     under the laws of any such state (except service of process with respect to
     the offering and sale of the Shares); and to promptly advise you of the
     receipt of any notification with respect to the suspension of the
     qualification of the Shares for sale in any jurisdiction or the initiation
     or threatening of any proceeding for such purpose;

          (b)  to make available to the Underwriters in New York City, as soon
     as practicable after the Registration Statement becomes effective, and
     thereafter from time to time to furnish to the Underwriters, as many copies
     of the Prospectus (or of the Prospectus as amended or supplemented if the
     Company shall have made any amendments or supplements thereto after the
     effective date of the Registration Statement) as the Underwriters may
     request for the purposes contemplated by the Act; in case any Underwriter
     is required to deliver a prospectus beyond the nine-month period referred
     to in Section 10(a)(3) of the Act in connection with the sale of the
     Shares, the Company will prepare promptly upon request and at its cost such
     amendment or amendments to the Registration Statement and such prospectuses
     as may be necessary to permit compliance with the requirements of Section
     10(a)(3) of the Act;

          (c)  to advise you promptly and (if requested by you) to confirm such
     advice in writing, (i) when the Registration Statement has become effective
     and when any post-effective amendment thereto becomes effective and (ii) if
     Rule 430A under the Act is used, when the Prospectus is filed with the
     Commission pursuant to Rule 424(b) under the Act (which the Company agrees
     to file in a timely manner under such Rules);

          (d)  to advise you promptly, confirming such advice in writing, of any
     request by the Commission for amendments or supplements to the Registration
     Statement or Prospectus or for additional information with respect thereto,
     or of notice of institution of proceedings for, or the entry of a stop
     order suspending the effectiveness of the Registration Statement and, if
     the Commission should enter a stop order suspending the effectiveness of
     the Registration Statement, to use its best efforts to obtain the lifting
     or removal of such order as soon as possible; to advise you promptly of any
     proposal to amend or supplement the Registration Statement or Prospectus
     and to file no such amendment or supplement to which you shall object in
     writing;

                                     -11-
<PAGE>

          (e)  subject to Section 4(o) hereof, to file promptly all reports and
     any definitive proxy or information statement required to be filed by the
     Company with the Commission in order to comply with the Exchange Act
     subsequent to the date of the Prospectus and for so long as the delivery of
     a prospectus is required in connection with the offering or sale of the
     shares, and to promptly notify you of such filing;

          (f)  if necessary or appropriate, to file in a timely fashion a
     registration statement pursuant to Rule 462(b) under the Act;

          (g)  to furnish to you and, upon request, to each of the other
     Underwriters for a period of five years from the date of this Agreement (i)
     copies of any reports or other communications which the Company shall send
     to its stockholders or shall from time to time publish or publicly
     disseminate, (ii) copies of all annual, quarterly and current reports filed
     with the Commission on Forms 10-K, 10-Q and 8-K, or such other similar form
     as may be designated by the Commission, (iii) copies of documents or
     reports filed with any national securities exchange on which any class of
     securities of the Company is listed, and (iv) such other information as you
     may reasonably request regarding the Company as soon as such
     communications, documents or information becomes available;

          (h)  to advise the Underwriters promptly of the occurrence of any
     event known to the Company within the time during which a Prospectus
     relating to the Shares is required to be delivered under the Act which
     would require the making of any change in the Prospectus then being used so
     that the Prospectus would not include an untrue statement of a material
     fact or omit to state a material fact necessary to make the statements
     therein, in the light of the circumstances under which they are made, not
     misleading, and, during such time, to prepare and furnish promptly to the
     underwriters, at no expense to the Underwriters, such amendments or
     supplements to such Prospectus as may be necessary to reflect any such
     change and to furnish you a copy of such proposed amendment or supplement
     before filing any such amendment or supplement with the Commission;

          (i)  to make generally available to its security holders, and to
     deliver to you, as soon as practicable an earnings statement of the Company
     (which will satisfy the provisions of Section 11(a) of the Act) covering a
     period of twelve months beginning after the effective date of the
     Registration Statement (as defined in Rule 158(c) of the Act) and ending
     not later than 15 months thereafter;

          (j)  to furnish to its shareholders as soon as practicable after the
     end of each fiscal year an annual report (including a balance sheet and
     statements of income, shareholders' equity and of cash flow of the Company
     for such fiscal year, accompanied by a copy of the certificate or report
     thereon of nationally recognized independent certified public accountants);

                                     -12-
<PAGE>

          (k)  to furnish to you four conformed copies of the Registration
     Statement, as initially filed with the Commission, and of all amendments
     thereto including all exhibits thereto) and sufficient conformed copies of
     the foregoing (other than exhibits) for distribution of a copy to each of
     the other Underwriters;

          (l)  to furnish to you as early as practicable prior to the time of
     purchase and the additional time of purchase, as the case may be, but not
     later than two business days prior thereto, a copy of the latest available
     quarterly (if available) or monthly unaudited interim consolidated
     financial statements, if any, of the Company, which have been read by the
     Company's independent certified public accountants, as stated in their
     letter to be furnished pursuant to Section 6(b) hereof;

          (m)  to apply the net proceeds from the sale of the Shares in the
     manner set forth under the caption "Use of Proceeds" in the Prospectus;

          (n)  to pay all costs, expenses, fees and taxes (other than any
     transfer taxes and fees and disbursements of counsel for the Underwriters,
     except as set forth under Section 5 hereof and clauses (iii), (iv) and (vi)
     below) in connection with (i) the preparation and filing of the
     Registration Statement, each Preliminary Prospectus, the Prospectus, and
     any amendments or supplements thereto, and the printing and furnishing of
     copies of each thereof to the Underwriters and to dealers (including costs
     of mailing and shipment), (ii) the registration, issue, sale and delivery
     of the Shares, (iii) the producing, word processing and/or printing of this
     Agreement, any Agreement Among Underwriters, any dealer agreements, any
     Powers of Attorney and any closing documents (including compilations
     thereof) and the reproduction and/or printing and furnishing of copies of
     each thereof to the Underwriters and (except closing documents) to dealers
     (including costs of mailing and shipment), (iv) the qualification of the
     Shares for offering and sale under state laws and the determination of
     their eligibility for investment under state law as aforesaid (including
     the reasonable legal fees and filing fees and other disbursements of
     counsel for the Underwriters) and the printing and furnishing of copies of
     any blue sky surveys or legal investment surveys to the Underwriters and to
     dealers, (v) any listing of the Shares on any securities exchange or
     qualification of the Shares for quotation on NASDAQ and any registration
     thereof under the Exchange Act, (vi) any filing for review of the public
     offering of the Shares by the NASD, including the associated reasonable
     fees and disbursements of counsel for the Underwriters, and (vii) the
     performance of the Company's other obligations hereunder;

          (o)  to furnish to you, before filing with the Commission subsequent
     to the effective date of the Registration Statement and during the period
     referred to in paragraph (h) above, a copy of any document proposed to be
     filed pursuant to Section 13, 14 or 15(d) of the Exchange Act;

                                     -13-
<PAGE>

          (p)  not to sell, offer to sell, contract to sell, hypothecate,
     pledge, grant any option to sell or otherwise dispose of, directly or
     indirectly, any shares of Common Stock or securities convertible into or
     exchangeable or exercisable for Common Stock or warrants or other rights to
     purchase Common Stock or any other shares of the Company that are
     substantially similar to Common Stock or permit the registration under the
     Act of any shares of Common Stock (other than shares of Common Stock issued
     or issuable under the stock option plan described in the Registration
     Statement and Prospectus) for a period of 180 days after the date hereof
     (the "Lock-up Period"), without the prior written consent of WDR, except
     for (i) the registration of the Shares and the sales to the Underwriters
     pursuant to this Agreement, (ii) issuances of Common Stock upon the
     exercise of outstanding options or warrants as disclosed in the
     Registration Statement and the Prospectus, such issued Common Stock not to
     be disposed of by the recipients thereof prior to the expiration of the
     Lock-up Period, (iii) the issuance of employee stock options not
     exercisable during the Lock-up Period (or, if so exercisable, to persons
     who have executed and delivered a Lock-Up Agreement to WDR) pursuant to
     stock option plans described in the Registration Statement and the
     Prospectus and (iv) the issuance of warrants to purchase Common Stock in an
     amount not to exceed 50,000 shares in the aggregate to strategic or
     collaborative partners of the Company which have executed and delivered a
     Lock-Up Agreement to WDR covering such warrants; and

     (q)  to use its best efforts to cause the Common Stock to be listed for
     quotation on the National Association of Securities Dealers Automated
     Quotation National Market System ("NASDAQ").

                                     -14-
<PAGE>

     5.  Reimbursement of Underwriters' Expenses.  The Company agrees that if
         ---------------------------------------
the Shares are not delivered for any reason other than the termination of this
Agreement pursuant to subsections (ii), (iii) or (iv) of the second paragraph of
Section 7 hereof or the last paragraph of Section 8 hereof or the default by one
or more of the Underwriters in its or their respective obligations hereunder, it
shall, in addition to paying the amounts described in Section 4(n) hereof,
reimburse the Underwriters for all of the out-of-pocket accountable expenses
actually incurred by the Underwriters, including the reasonable fees and
disbursements of their counsel.

     6.  Conditions of Underwriters' Obligations.  The several obligations of
         ---------------------------------------
the Underwriters hereunder are subject to the accuracy of the representations
and warranties of the Company on the date hereof and at the time of purchase
(and the several obligations of the Underwriters at the additional time of
purchase are subject to the accuracy of the representations and warranties of
the Company on the date hereof and at the time of purchase (unless previously
waived) and at the additional time of purchase, as the case may be), the
performance by the Company of its obligations hereunder and to the following
additional conditions precedent:

          (a)  The Company shall furnish to you at the time of purchase and at
     the additional time of purchase, as the case may be, an opinion of Thompson
     & Knight LLP, counsel for the Company, addressed to the Underwriters, and
     dated the time of purchase or the additional time of purchase, as the case
     may be, with reproduced copies for each of the other Underwriters and in
     form reasonably satisfactory to Dewey Ballantine LLP, counsel for the
     Underwriters, stating that:

                                     -15-
<PAGE>

          (i)    the Company has been duly incorporated and is validly existing
     as a corporation and is in good standing under the laws of the State of
     Delaware, with full power and authority to own, lease and operate its
     properties and conduct its business as described in the Registration
     Statement and the Prospectus, to execute and deliver this Agreement and to
     issue, sell and deliver the Shares as herein contemplated;

          (ii)   the Company is duly qualified to do business as a foreign
     corporation and is in good standing in each jurisdiction in which the
     ownership or leasing of its properties or the conduct of its business
     requires such qualification, except where the failure to so qualify would
     not individually or in the aggregate have a Material Adverse Effect;

          (iii)  this Agreement has been duly authorized, executed and delivered
     by the Company;

          (iv)   the Shares have been duly authorized and, when issued and
     delivered to and paid for by the Underwriters, will be validly issued,
     fully paid and non-assessable;

          (v)    the Company has authorized and outstanding shares of capital
     stock as set forth in the Registration Statement and the Prospectus; the
     outstanding shares of capital stock of the Company have been duly and
     validly authorized and issued and are fully paid, nonassessable and free of
     statutory and, to such counsel's knowledge, contractual preemptive rights,
     resale rights, rights of first refusal and similar rights, except as set
     forth in the Prospectus and the Registration Statement; the Shares when
     issued will be free of statutory and, to such counsel's knowledge,
     contractual preemptive rights, resale rights, rights of first refusal and
     similar rights; the certificates for the Shares are in due and proper form
     and the holders of the Shares will not be subject to personal liability by
     reason of being such holders;

          (vi)   the capital stock of the Company, including the Shares,
     conforms to the description thereof contained in the Registration Statement
     and Prospectus;

          (vii) the Registration Statement and the Prospectus (except as to the
     financial statements and schedules and other financial and statistical data
     contained therein, as to which such counsel need express no opinion) comply
     as to form in all material respects with the requirements of the Act;

          (viii) the Registration Statement has become effective under the Act
     and, to such counsel's knowledge, no stop order proceedings with respect


                                     -16-
<PAGE>

     thereto are pending or threatened under the Act and any required filing of
     the Prospectus, and any supplement thereto pursuant to Rule 424 under the
     Act has been made in the manner and within the time period required by such
     Rule 424;

          (ix)   no approval, authorization, consent or order of or filing with
     any national, state or local governmental or regulatory commission, board,
     body, authority or agency is required in connection with the execution,
     delivery and performance of this Agreement, the issuance and sale of the
     Shares and the consummation of the transactions contemplated hereby and by
     the Registration Statement, other than registration of the Shares under the
     Act and other than any necessary qualification under the state securities
     or blue sky laws of the various jurisdictions in which the Shares are being
     offered by the Underwriters, as to which such qualification such counsel
     need express no opinion;

          (x)    the execution, delivery and performance of this agreement by
     the Company and the transactions contemplated hereby and by the
     Registration Statement do not and will not conflict with, or result in any
     breach of, or constitute a default under (nor constitute any event which
     with notice, lapse of time, or both, would result in any breach of, or
     constitute a default under), any provisions of the charter or by-laws or
     other organizational documents of the Company or under any provision of any
     license, permit, franchise, indenture, mortgage, deed of trust, bank loan
     or credit agreement or other evidence of indebtedness, or any lease,
     contract or other agreement or instrument to which the Company is a party
     or by which its properties may be bound or affected that is filed as an
     exhibit to the Registration Statement or under any federal, state or local
     law, regulation or rule (other than applicable state securities and Blue
     Sky laws, as to which such counsel need not express an opinion), or any
     decree, judgment or order applicable to the Company and known to such
     counsel;

          (xi)   to such counsel's knowledge, [Based on a certificate of an
     officer of the company,] the Company is not in violation of its charter or
     by-laws, and the Company is not in breach of nor in default under (nor has
     any event occurred which with notice, lapse of time, or both would result
     in any breach of, or constitute a default under), any license, permit,
     franchise, indenture, mortgage, deed of trust, bank loan or credit
     agreement or other evidence of indebtedness, or any lease, contract or
     other agreement or instrument to which the Company is or was a party or by
     which it or its properties may be bound or affected or in violation of any
     federal, state, local or foreign law, regulation or rule or any decree,
     judgment or order applicable


                                     -17-
<PAGE>

     to the Company the effect of which would individually or in the aggregate
     have a Material Adverse Effect;

          (xii)  to such counsel's knowledge, there are no contracts, licenses,
     agreements, leases or documents of a character which are required to be
     filed as exhibits to the Registration Statement or to be described in the
     Prospectus which have not been so filed or described;

          (xiii) to such counsel's knowledge, there are no private or
     governmental actions, suits, claims, investigations or proceedings pending,
     threatened or contemplated to which the Company or any of its officers is
     subject or of which any of its properties is subject, whether at law, in
     equity or before or by any federal, state, local or foreign governmental or
     regulatory commission, board, body, authority or agency which are required
     to be described in the Registration Statement or Prospectus that are not so
     described;

          (xiv)  the Company is not, and after the offering and sale of the
     Shares, will not be, an "investment company," or a "promoter," "principal
     underwriter" for or an entity controlled by an "investment company," as
     such terms are defined in the Investment Company Act;

          (xv)   the statements in the Registration Statement and Prospectus,
     insofar as they are descriptions of contracts, agreements or other legal
     documents, or refer to statements of law or legal conclusions, are accurate
     in all material respects and present fairly the information required to be
     shown; and

          (xvi)  to the knowledge of such counsel, except as described in the
     Registration Statement and Prospectus, no person is entitled to
     registration rights with respect to shares of capital stock or other
     securities of the Company.

          In addition, such counsel shall state that it has participated in
conferences with officers and other representatives of the Company,
representatives of the independent public accountants of the Company and
representatives of the Underwriters at which the contents of the Registration
Statement and Prospectus were discussed and, although such counsel is not
passing upon and does not assume responsibility for the accuracy, completeness
or fairness of the statements contained in the Registration Statement or
Prospectus (except as and to the extent stated in subparagraphs (vi), (vii) and
(xv) above), on the basis of the foregoing nothing has come to the attention of
such counsel that causes them to believe that the Registration Statement or any
amendment thereto at the time such Registration Statement or amendment became
effective contained an untrue statement of a material fact or omitted to state a
material fact required to be stated therein or necessary to make the statements
therein not


                                     -18-
<PAGE>

misleading, or that the Prospectus or any supplement thereto at the date of such
Prospectus or such supplement, and at all times up to and including the time of
purchase or additional time of purchase, as the case may be, contained an untrue
statement of a material fact or omitted to state a material fact required to be
stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading (it being understood
that such counsel need make no such statement with respect to the financial
statements and schedules and other financial and statistical data included in
the Registration Statement or Prospectus).

          (b)    You shall have received at the time of purchase and at the
additional time of purchase, as the case may be, the opinion of Pepper Hamilton,
LLP, special counsel to the Company with respect to patents and proprietary
rights, dated the time of purchase or the additional time of purchase, as the
case may be, stating that:

                 (i)  To such counsel's knowledge, except as described in the
          Prospectus, (A) the Company has valid license rights or clear title to
          the Intellectual Property referenced in the Prospectus, and there are
          no rights of third parties to any such Intellectual Property; (B)
          there is no infringement or other violation by third parties of any of
          the Intellectual Property of the Company referenced in the Prospectus;
          (C) there is no infringement or other violation by the Company of any
          Intellectual Property of others; (D) there is no pending or threatened
          action, suit proceeding or claim by governmental authorities or others
          that the Company infringes or otherwise violates any Intellectual
          Property of others, and such counsel is unaware of any facts which
          would form a reasonable basis for any such claim; and (E) there is no
          pending or threatened action, suit, proceeding or claim by
          governmental authorities or others challenging the rights of the
          Company in or to, or challenging the scope of, any Intellectual
          Property of the Company referenced in the Prospectus, and such counsel
          is unaware of any facts which would form a reasonable basis for any
          such claim;

                 (ii) to such counsel's knowledge, the patent applications of
          the Company presently on file disclose patentable subject matter, and
          such counsel is not aware of any inventorship challenges, any
          interference which has been declared or provoked, or any other
          material fact with respect to the patent applications of the Company
          presently on file that (A) would preclude the issuance of patents with
          respect to such applications, or (B) would lead such counsel to
          conclude that such patents, when issued, would not be valid and
          enforceable in accordance with applicable regulations; and


                                     -19-
<PAGE>

                 (iii) the statements in the Registration Statement and the
          Prospectus referencing Intellectual Property matters, insofar as such
          statements constitute summaries of legal matters, contracts,
          agreements, documents or proceedings referred to therein, or refer to
          statements of law or legal conclusions, are in all material respects
          accurate and complete statements or summaries of the matters therein
          set forth. Nothing has come to such counsel's attention that causes
          them to believe that such above described portions of the Registration
          Statement, at the time such Registration Statement became effective,
          contained an untrue statement of a material fact or omitted to state a
          material fact required to be stated therein or necessary to make the
          statements therein not misleading, or that such above described
          portions of the Prospectus, at the date of the Prospectus contained an
          untrue statement of material fact or omitted to state a material fact
          required to be stated therein or necessary to make the statements
          therein, in light of the circumstances under which they were made, not
          misleading.

          (c)  You shall have received at the time of purchase and at the
additional time of purchase, as the case may be, the opinion of Hyman, Phelps &
McNamara, P.C., regulatory counsel to the Company, dated the time of purchase or
the additional time of purchase, as the case may be, to the effect that the
statements in the Registration Statement and the Prospectus referencing
regulatory matters, insofar as such statements constitute summaries of food and
drug regulatory matters with respect to the Company, as of the date of the
Registration Statement and the Prospectus and as of the date of such opinion,
are in all material respects accurate and complete statements or summaries of
the matters therein set forth; and nothing has come to such counsel's attention
that causes such counsel to believe that the above-described portions of the
Registration Statement and the Prospectus, at the date of the Registration
Statement and the Prospectus or at the date of such opinion, contained or
contains an untrue statement of material fact or omitted or omits to state a
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading.

          (d)  You shall have received at the time of purchase and at the
additional time of purchase, as the case may be, the favorable opinion of Dewey
Ballantine LLP, counsel for the Underwriters, dated the time of purchase or the
additional time of purchase, as the case may be, with respect to the issuance
and sale of the Shares by the Company, the Registration Statement, the
Prospectus (together with any supplement thereto) and such other related matters
as the Underwriters may require.

          (e)  You shall have received from Ernst & Young LLP, letters dated,
respectively, the date of this Agreement and the time of purchase and additional
time of purchase, as the case may be, and addressed to the Underwriters (with
reproduced

                                     -20-
<PAGE>

copies for each of the Underwriters) in the forms heretofore approved
by Dewey Ballantine LLP, counsel for the Underwriters.


          (f)  No amendment or supplement to the Registration Statement or
Prospectus shall be filed prior to the time the Registration Statement becomes
effective to which you object in writing.

          (g)  The Registration Statement shall become effective, or if Rule
430A under the Act is used, the Prospectus shall have been filed with the
Commission pursuant to Rule 424(b) under the Act, at or before 5:30 P.M., New
York City time, on the date of this Agreement, unless a later time (but not
later than 5:30 P.M., New York City time, on the second full business day after
the date of this Agreement) shall be agreed to by the Company and you in writing
or by telephone, confirmed in writing; provided, however, that the Company and
                                       --------  -------
you and any group of Underwriters, including you, who have agreed hereunder to
purchase in the aggregate at least 50% of the Firm Shares may from time to time
agree on a later date.

          (h)  Prior to the time of purchase or the additional time of purchase,
as the case may be, (i) no stop order with respect to the effectiveness of the
Registration Statement shall have been issued under the Act or proceedings
initiated under Section 8(d) or 8(e) of the Act; (ii) the Registration Statement
and all amendments thereto, or modifications thereof, if any, shall not contain
an untrue statement of a material fact or omit to state a material fact required
to be stated therein or necessary to make the statements therein not misleading;
and (iii) the Prospectus and all amendments or supplements thereto, or
modifications thereof, if any, shall not contain an untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein, in the light of the circumstances
under which they are made, not misleading.

          (i)  Between the time of execution of this Agreement and the time of
purchase or the additional time of purchase, as the case may be, (i) no material
and unfavorable change, or any development involving a prospective material and
adverse change, financial or otherwise (other than as specifically identified in
the Registration Statement and Prospectus), in the business, properties,
condition or results of operations of the Company shall occur or become known
and (ii) no transaction which is material and unfavorable to the Company shall
have been entered into by the Company.

          (j)  The Company will, at the time of purchase or additional time of
purchase, as the case may be, deliver to you a certificate of its President and
its Chief Financial Officer to the effect that the representations and
warranties of the Company as set forth in this Agreement are true and correct as
of each such date, that the Company has performed such of their obligations
under this Agreement as are to be

                                     -21-
<PAGE>

     performed at or before the time of purchase and at or before the additional
     time of purchase, as the case may be, and the conditions set forth in
     paragraphs (g), (h) and (i) of this Section 6 have been met.

          (k)  You shall have received signed letters, dated the date of this
     Agreement, from each of the officers and directors of the Company and the
     holders of at least 98.8% of the outstanding Common Stock of the Company
     agreeing with the Underwriters that such persons will not sell, offer or
     agree to sell, contract to sell, hypothecate, pledge, grant any option to
     sell or otherwise dispose of, directly or indirectly, any shares of Common
     Stock of the Company or securities convertible into or exchangeable or
     exercisable for Common Stock or warrants or other rights to purchase Common
     Stock or any other securities of the Company that are substantially similar
     to the Common Stock for a period of 180 days after the date of the
     Prospectus without WDR's prior written consent.

          (l)  The Company shall have furnished to you such other documents and
     certificates as to the accuracy and completeness of any statement in the
     Registration Statement and the Prospectus as of the time of purchase and
     the additional time of purchase, as the case may be, as you may reasonably
     request.

          (m)  The Shares shall have been approved for listing for quotation on
     NASDAQ, subject only to notice of issuance at or prior to the time of
     purchase or the additional time of purchase, as the case may be.

          7.  Effective Date of Agreement; Termination. This Agreement shall
              ----------------------------------------
become effective (i) if Rule 430A under the Act is not used, when you shall have
received notification of the effectiveness of the Registration Statement, or
(ii) if Rule 430A under the Act is used, when the parties hereto have executed
and delivered this Agreement.

          The obligations of the several Underwriters hereunder shall be subject
to termination in the absolute discretion of you or any group of Underwriters
(which may include you) which has agreed to purchase in the aggregate at least
50% of the Firm Shares, (i) if, since the time of execution of this Agreement or
the respective dates as of which information is given in the Registration
Statement and Prospectus, there has been any material adverse and unfavorable
change, or any development involving a prospective material adverse change,
financial or otherwise (other than as specifically identified in the
Registration Statement and Prospectus), in the business, properties, condition
or results of operations of the Company which would, in your judgment or in the
judgment of such group of Underwriters, make it impracticable to market the
Shares, or, (ii) if, at any time prior to the time of purchase or, with respect
to the purchase of any Additional Shares, the additional time of purchase, as
the case may be, trading in securities on the New York Stock Exchange, the
American Stock Exchange or the Nasdaq National Market shall have been suspended
or limitations or minimum prices shall have been established on the New York
Stock Exchange, the American

                                     -22-
<PAGE>

Stock Exchange or the Nasdaq National Market, or (iii) if a banking moratorium
shall have been declared either by the United States or New York State
authorities, or (iv) if the United States shall have declared war in accordance
with its constitutional processes or there shall have occurred any material
outbreak or escalation of hostilities or other national or international
calamity or crisis of such magnitude in its effect on the financial markets of
the United States as, in your judgment or in the judgment of such group of
Underwriters, to make it impracticable to market the Shares.

          If you or any group of Underwriters elects to terminate this Agreement
as provided in this Section 7, the Company and each other Underwriter shall be
notified promptly by letter or telegram.

          If the sale to the Underwriters of the Shares, as contemplated by this
Agreement, is not carried out by the Underwriters for any reason permitted under
this Agreement or if such sale is not carried out because the Company shall be
unable to comply with any of the terms of this Agreement, the Company shall not
be under any obligation or liability under this Agreement (except to the extent
provided in Sections 4(n), 5 and 9 hereof), and the Underwriters shall be under
no obligation or liability to the Company under this Agreement (except to the
extent provided in Section 9 hereof) or to one another hereunder.

          8.  Increase in Underwriters' Commitments. Subject to Sections 6 and
              -------------------------------------
7, if any Underwriter shall default in its obligation to take up and pay for the
Firm Shares to be purchased by it hereunder (otherwise than for a reason
sufficient to justify the termination of this Agreement under the provisions of
Section 7 hereof) and if the number of Firm Shares which all Underwriters so
defaulting shall have agreed but failed to take up and pay for does not exceed
10% of the total number of Firm Shares, the non-defaulting Underwriters shall
take up and pay for (in addition to the aggregate number of Firm Shares they are
obligated to purchase pursuant to Section 1 hereof) the number of Firm Shares
agreed to be purchased by all such defaulting Underwriters, as hereinafter
provided. Such Shares shall be taken up and paid for by such non-defaulting
Underwriter or Underwriters in such amount or amounts as you may designate with
the consent of each Underwriter so designated or, in the event no such
designation is made, such Shares shall be taken up and paid for by all non-
defaulting Underwriters pro rata in proportion to the aggregate number of Firm
Shares set opposite the names of such non-defaulting Underwriters in Schedule A.

          Without relieving any defaulting Underwriter from its obligations
hereunder, the Company agrees with the non-defaulting Underwriters that it will
not sell any Firm Shares hereunder unless all of the Firm Shares are purchased
by the Underwriters (or by substituted Underwriters selected by you with the
approval of the Company or selected by the Company with your approval).

          If a new Underwriter or Underwriters are substituted by the
Underwriters or by the Company for a defaulting Underwriter or Underwriters in
accordance with the foregoing

                                     -23-
<PAGE>

provision, the Company or you shall have the right to postpone the time of
purchase for a period not exceeding five business days in order that any
necessary changes in the Registration Statement and Prospectus and other
documents may be effected.

          The term Underwriter as used in this Agreement shall refer to and
include any Underwriter substituted under this Section 8 with like effect as if
such substituted Underwriter had originally been named in Schedule A.

          If the aggregate number of Shares which the defaulting Underwriter or
Underwriters agreed to purchase exceeds 10% of the total number of Shares which
all Underwriters agreed to purchase hereunder, and if neither the non-defaulting
Underwriters nor the Company shall make arrangements within the five business
day period stated above for the purchase of all the Shares which the defaulting
Underwriter or Underwriters agreed to purchase hereunder, this Agreement shall
be terminated without further act or deed and without any liability on the part
of the Company to any non-defaulting Underwriter and without any liability on
the part of any non-defaulting Underwriter to the Company.  Nothing in this
paragraph, and no action taken hereunder, shall relieve any defaulting
Underwriter from liability in respect of any default of such Underwriter under
this Agreement.

          9.   Indemnity and Contribution.
               --------------------------

          (a)  The Company agrees to indemnify, defend and hold harmless each
Underwriter, its partners, directors and officers, and any person who controls
any Underwriter within the meaning of Section 15 of the Act or Section 20 of the
Exchange Act, and the successors and assigns of all of the foregoing persons
from and against any loss, damage, expense, liability or claim (including the
reasonable cost of investigation) which, jointly or severally, any such
Underwriter or any such person may incur under the Act, the Exchange Act, the
common law or otherwise, insofar as such loss, damage, expense, liability or
claim arises out of or is based upon (i) any untrue statement or alleged untrue
statement of a material fact contained in the Registration Statement (or in the
Registration Statement as amended by any post-effective amendment thereof by the
Company) or in a Prospectus (the term Prospectus for the purpose of this Section
9 being deemed to include any Preliminary Prospectus, the Prospectus and the
Prospectus as amended or supplemented by the Company), or arises out of or is
based upon any omission or alleged omission to state a material fact required to
be stated in either such Registration Statement or Prospectus or necessary to
make the statements made therein not misleading, except insofar as any such
loss, damage, expense, liability or claim arises out of or is based upon any
untrue statement or alleged untrue statement of a material fact contained in and
in conformity with information furnished in writing by or on behalf of any
Underwriter through you to the Company expressly for use with reference to such
Underwriter in such Registration Statement or such Prospectus or arises out of
or is based upon any omission or alleged omission to state a material fact in
connection with such information required to be stated in such Registration
Statement or such Prospectus or necessary to make such information not
misleading or (ii)

                                     -24-
<PAGE>

the Directed Share Program, provided that, the Company shall not be responsible
for any loss, damage, expense, liability, or claim that is finally judicially
determined to have resulted from the bad faith or gross negligence of the
Underwriters in conducting the Directed Share Program.

          If any action, suit or proceeding (together, a "Proceeding") is
brought against an Underwriter or any such person in respect of which indemnity
may be sought against the Company pursuant to the foregoing paragraph, such
Underwriter or such person shall promptly notify the Company in writing of the
institution of such Proceeding and the Company shall assume the defense of such
Proceeding, including the employment of counsel reasonably satisfactory to such
indemnified party and payment of all fees and expenses; provided, however, that
                                                        --------  -------
the omission to so notify the Company shall not relieve the Company from any
liability which the Company may have to any Underwriter or any such person or
otherwise.  Such Underwriter or such person shall have the right to employ its
or their own counsel in any such case, but the fees and expenses of such counsel
shall be at the expense of such Underwriter or of such person unless the
employment of such counsel shall have been authorized in writing by the Company
in connection with the defense of such Proceeding or the Company shall not have,
within a reasonable period of time in light of the circumstances, employed
counsel to defend such Proceeding or such indemnified party or parties shall
have reasonably concluded that there may be defenses available to it or them
which are different from, additional to or in conflict with those available to
the Company (in which case the Company shall not have the right to direct the
defense of such Proceeding on behalf of the indemnified party or parties), in
any of which events such fees and expenses shall be borne by the Company and
paid as incurred (it being understood, however, that the Company shall not be
liable for the expenses of more than one separate counsel (in addition to any
local counsel) in any one Proceeding or series of related Proceedings in the
same jurisdiction representing the indemnified parties who are parties to such
Proceeding).  The Company shall not be liable for any settlement of any
Proceeding effected without the written consent of the Company but if settled
with the written consent of the Company, the Company agrees to indemnify and
hold harmless any Underwriter and any such person from and against any loss or
liability by reason of such settlement.  Notwithstanding the foregoing sentence,
if at any time an indemnified party shall have requested an indemnifying party
to reimburse the indemnified party for fees and expenses of counsel as
contemplated by the second sentence of this paragraph, then the indemnifying
party agrees that it shall be liable for any settlement of any Proceeding
effected without its written consent if (i) such settlement is entered into more
than 60 days after receipt by such indemnifying party of the aforesaid request,
(ii) such

                                     -25-
<PAGE>

indemnifying party shall not have reimbursed the indemnified party in accordance
with such request prior to the date of such settlement and (iii) such
indemnified party shall have given the indemnifying party at least 30 days'
prior notice of its intention to settle. No indemnifying party shall, without
the prior written consent of the indemnified party, effect any settlement of any
pending or threatened Proceeding in respect of which any indemnified party is or
could have been a party and indemnity could have been sought hereunder by such
indemnified party, unless such settlement includes an unconditional release of
such indemnified party from all liability on claims that are the subject matter
of such Proceeding and does not include an admission of fault, culpability or a
failure to act, by or on behalf of such indemnified party.

          (b)  In connection with the offer and sale of the Reserved Shares, the
Company agrees to pay WDR, at its request, the full purchase price of all
Reserved Shares which were subject to a properly confirmed agreement to purchase
and for which any Directed Share Participant failed to pay therefor and accept
delivery thereof.

          (c)  Each Underwriter severally agrees to indemnify, defend and hold
harmless the Company, its directors and officers, and any person who controls
the Company within the meaning of Section 15 of the Act or Section 20 of the
Exchange Act, and the successors and assigns of all of the foregoing persons
from and against any loss, damage, expense, liability or claim (including the
reasonable cost of investigation) which, jointly or severally, the Company or
any such person may incur under the Act, the Exchange Act, the common law or
otherwise, insofar as such loss, damage, expense, liability or claim arises out
of or is based upon any untrue statement or alleged untrue statement of a
material fact contained in and in conformity with information furnished in
writing by or on behalf of such Underwriter through you to the Company expressly
for use with reference to such Underwriter in the Registration Statement (or in
the Registration Statement as amended by any post-effective amendment thereof by
the Company) or in a Prospectus, or arises out of or is based upon any omission
or alleged omission to state a material fact in connection with such information
required to be stated in such Registration Statement or such Prospectus or
necessary to make such information not misleading.

          If any Proceeding is brought against the Company or any such person in
respect of which indemnity may be sought against any Underwriter pursuant to the
foregoing paragraph, the Company or such person shall promptly notify such
Underwriter in writing of the institution of such Proceeding and such
Underwriter shall assume the defense of such Proceeding, including the
employment of counsel reasonably satisfactory to such indemnified party and
payment of all fees and expenses; provided, however, that the omission to so
                                  --------  -------
notify such Underwriter shall not relieve such Underwriter from any liability
which such Underwriter may have to the Company or any such person or otherwise.
The Company or such person shall have the right to employ its own counsel in any
such case, but the fees and expenses of such counsel shall be at the expense of
the Company or such person unless the employment of such counsel shall have been
authorized in writing by such Underwriter in

                                     -26-
<PAGE>

connection with the defense of such Proceeding or such Underwriter shall not
have, within a reasonable period of time in light of the circumstances, employed
counsel to have charge of the defense of such Proceeding or such indemnified
party or parties shall have reasonably concluded that there may be defenses
available to it or them which are different from or additional to or in conflict
with those available to such Underwriter (in which case such Underwriter shall
not have the right to direct the defense of such Proceeding on behalf of the
indemnified party or parties, but such Underwriter may employ counsel and
participate in the defense thereof but the fees and expenses of such counsel
shall be at the expense of such Underwriter), in any of which events such fees
and expenses shall be borne by such Underwriter and paid as incurred (it being
understood, however, that such Underwriter shall not be liable for the expenses
of more than one separate counsel (in addition to any local counsel) in any one
Proceeding or series of related Proceedings in the same jurisdiction
representing the indemnified parties who are parties to such Proceeding). No
Underwriter shall be liable for any settlement of any such Proceeding effected
without the written consent of such Underwriter but if settled with the written
consent of such Underwriter, such Underwriter agrees to indemnify and hold
harmless the Company and any such person from and against any loss or liability
by reason of such settlement. Notwithstanding the foregoing sentence, if at any
time an indemnified party shall have requested an indemnifying party to
reimburse the indemnified party for fees and expenses of counsel as contemplated
by the second sentence of this paragraph, then the indemnifying party agrees
that it shall be liable for any settlement of any Proceeding effected without
its written consent if (i) such settlement is entered into more than 60 days
after receipt by such indemnifying party of the aforesaid request, (ii) such
indemnifying party shall not have reimbursed the indemnified party in accordance
with such request prior to the date of such settlement and (iii) such
indemnified party shall have given the indemnifying party at least 30 days'
prior notice of its intention to settle. No indemnifying party shall, without
the prior written consent of the indemnified party, effect any settlement of any
pending or threatened Proceeding in respect of which any indemnified party is or
could have been a party and indemnity could have been sought hereunder by such
indemnified party, unless such settlement includes an unconditional release of
such indemnified party from all liability on claims that are the subject matter
of such Proceeding.

          (d)  If the indemnification provided for in this Section 9 is
unavailable to an indemnified party under subsections (a), (b) or (c) of this
Section 9 in respect of any losses, damages, expenses, liabilities or claims
referred to therein, then each applicable indemnifying party, in lieu of
indemnifying such indemnified party, shall contribute to the amount paid or
payable by such indemnified party as a result of such losses, damages, expenses,
liabilities or claims (i) in such proportion as is appropriate to reflect the
relative benefits received by the Company on the one hand and the Underwriters
on the other hand from the offering of the Shares or (ii) if the allocation
provided by clause (i) above is not permitted by applicable law, in such
proportion as is appropriate to reflect not only the relative benefits referred
to in clause (i) above but also the relative fault of the Company on the one
hand and of the

                                     -27-
<PAGE>

Underwriters on the other in connection with the statements or omissions which
resulted in such losses, damages, expenses, liabilities or claims, as well as
any other relevant equitable considerations. The relative benefits received by
the Company on the one hand and the Underwriters on the other shall be deemed to
be in the same respective proportions as the total proceeds from the offering
(net of underwriting discounts and commissions but before deducting expenses)
received by the Company and the total underwriting discounts and commissions
received by the Underwriters, bear to the aggregate public offering price of the
Shares. The relative fault of the Company on the one hand and of the
Underwriters on the other shall be determined by reference to, among other
things, whether the untrue statement or alleged untrue statement of a material
fact or omission or alleged omission relates to information supplied by the
Company or by the Underwriters and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such statement or
omission. The amount paid or payable by a party as a result of the losses,
damages, expenses, liabilities and claims referred to in this subsection shall
be deemed to include any legal or other fees or expenses reasonably incurred by
such party in connection with investigating, preparing to defend or defending
any Proceeding.

          (e)  The Company and the Underwriters agree that it would not be just
and equitable if contribution pursuant to this Section 9 were determined by pro
rata allocation (even if the Underwriters were treated as one entity for such
purpose) or by any other method of allocation that does not take account of the
equitable considerations referred to in subsection (c) above. Notwithstanding
the provisions of this Section 9, no Underwriter shall be required to contribute
any amount in excess of the amount by which the total price at which the Shares
underwritten by such Underwriter and distributed to the public were offered to
the public exceeds the amount of any damage which such Underwriter has otherwise
been required to pay by reason of such untrue statement or alleged untrue
statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Act) shall be
entitled to contribution from any person who was not guilty of such fraudulent
misrepresentation. The Underwriters' obligations to contribute pursuant to this
Section 9 are several in proportion to their respective underwriting commitments
and not joint.

          (f)  The indemnity and contribution agreements contained in this
Section 9 and the covenants, warranties and representations of the Company
contained in this Agreement shall remain in full force and effect regardless of
any investigation made by or on behalf of any Underwriter, its partners,
directors or officers or any person (including each partner, officer or director
of such person) who controls any Underwriter within the meaning of Section 15 of
the Act or Section 20 of the Exchange Act, or by or on behalf of the Company its
directors or officers or any person who controls the Company within the meaning
of Section 15 of the Act or Section 20 of the Exchange Act, and shall survive
any termination of this Agreement or the issuance and delivery of the Shares.
The Company and each Underwriter agree promptly to notify each other of the
commencement of any

                                     -28-
<PAGE>

Proceeding against it and, in the case of the Company, against any of the
Company's officers or directors in connection with the issuance and sale of the
Shares, or in connection with the Registration Statement or Prospectus.

                                     -29-
<PAGE>

          10.  Notices. Except as otherwise herein provided, all statements,
               -------
requests, notices and agreements shall be in writing or by telegram and, if to
the Underwriters, shall be sufficient in all respects if delivered or sent to
Warburg Dillon Read LLC, 299 Park Avenue, New York, N.Y. 10171-0026, Attention:
Syndicate Department and, if to the Company, shall be sufficient in all respects
if delivered or sent to the Company at the offices of the Company at 12212
Technology Boulevard, Austin, Texas, 78727, Attention: General Counsel.

          11.  Governing Law; Construction. This Agreement and any claim,
               ---------------------------
counterclaim or dispute of any kind or nature whatsoever arising out of or in
any way relating to this Agreement ("Claim"), directly or indirectly, shall be
governed by, and construed in accordance with, the laws of the State of New
York. The Section headings in this Agreement have been inserted as a matter of
convenience of reference and are not a part of this Agreement.

          12.  Submission to Jurisdiction. Except as set forth below, no Claim
               --------------------------
may be commenced, prosecuted or continued in any court other than the courts of
the State of New York located in the City and County of New York or in the
United States District Court for the Southern District of New York, which courts
shall have jurisdiction over the adjudication of such matters, and the Company
consents to the jurisdiction of such courts and personal service with respect
thereto. The Company hereby consents to personal jurisdiction, service and venue
in any court in which any Claim arising out of or in any way relating to this
Agreement is brought by any third party against WDR or any indemnified party.
Each of WDR and the Company (on their respective behalfs and, to the extent
permitted by applicable law, on behalf of their respective stockholders and
affiliates) waives all right to trial by jury in any action, proceeding or
counterclaim (whether based upon contract, tort or otherwise) in any way arising
out of or relating to this Agreement. The Company agrees that a final judgment
in any such action, proceeding or counterclaim brought in any such court shall
be conclusive and binding upon the Company and may be enforced in any other
courts in the jurisdiction of which the Company is or may be subject, by suit
upon such judgment.

          13.  Parties at Interest. The Agreement herein set forth has been and
               -------------------
is made solely for the benefit of the Underwriters and the Company and to the
extent provided in Section 9 hereof the controlling persons, directors and
officers referred to in such section, and their respective successors, assigns,
heirs, personal representatives and executors and administrators. No other
person, partnership, association or corporation (including a purchaser, as such
purchaser, from any of the Underwriters) shall acquire or have any right under
or by virtue of this Agreement.

          14.  Counterparts. This Agreement may be signed by the parties in one
               ------------
or more counterparts which together shall constitute one and the same agreement
among the parties.

                                     -30-
<PAGE>

          15.  Successors and Assigns. This Agreement shall be binding upon the
               ----------------------
Underwriters, the Company and their successors and assigns and any successor or
assign of any substantial portion of the Company's, and any of the Underwriters'
respective businesses and/or assets.

          16.  Miscellaneous. WDR, an indirect, wholly owned subsidiary of UBS
               -------------
AG, is not a bank and is separate from any affiliated bank, including any U.S.
branch or agency of UBS AG. Because WDR is a separately incorporated entity, it
is solely responsible for its own contractual obligations and commitments,
including obligations with respect to sales and purchases of securities.
Securities sold, offered or recommended by WDR are not deposits, are not insured
by the Federal Deposit Insurance Corporation, are not guaranteed by a branch or
agency, and are not otherwise an obligation or responsibility of a branch or
agency.

          A lending affiliate of WDR may have lending relationships with issuers
of securities underwritten or privately placed by WDR.  To the extent required
under the securities laws, prospectuses and other disclosure documents for
securities underwritten or privately placed by WDR will disclose the existence
of any such lending relationships and whether the proceeds of the issue will be
used to repay debts owed to affiliates of WDR.

                                     -31-
<PAGE>

          If the foregoing correctly sets forth the understanding among the
Company  and the Underwriters, please so indicate in the space provided below
for the purpose, whereupon this letter and your acceptance shall constitute a
binding agreement among the Company and the Underwriters, severally.

                                        Very truly yours,

                                        LUMINEX CORPORATION

                                        By:_______________________________
                                           Name:
                                           Title:


Accepted and agreed to as of the
 date first above written, on behalf of
 themselves and the other several Underwriters
 named in Schedule A

WARBURG DILLON READ LLC
LEHMAN BROTHERS INC.
DAIN RAUSCHER INCORPORATED

By:  WARBURG DILLON READ LLC

By:________________________
   Name:
   Title: Managing Director

By:________________________
   Name:
   Title: Director

                                     -32-
<PAGE>

                                  SCHEDULE A

<TABLE>
<CAPTION>
                                                             Number of
Underwriter                                                 Firm Shares
- -----------------------------------------------------      _____________
<S>                                                        <C>
WARBURG DILLON READ LLC..............................
LEHMAN BROTHERS INC..................................
DAIN RAUSCHER INCORPORATED...........................
                         Total.......................      =============
</TABLE>

<PAGE>

                                                                     EXHIBIT 4.1

COMMON STOCK                                             COMMON STOCK

NUMBER                                                   NUMBER

                               [LOGO OF LUMINEX]

                              LUMINEX CORPORATION

This certificate is transferable                             CUSIP 55027E 10 2
in New York, NY and Ridgefield, NJ                         SEE LEGENDS ON
                                                        REVERSE

This certifies that



is the owner of

FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $.001 PAR VALUE PER SHARE
OF

LUMINEX CORPORATION, incorporated under the laws of the state of Delaware,
transferable on the books of the Corporation by the holder hereof in person or
by duly authorized attorney upon surrender of this certificate properly
executed.  This certificate and the shares represented hereby are issued and
shall be held subject to all the provisions of the Restated Certificate of
Incorporation (copies of which are on file with the Transfer Agent).  This
certificate is not valid until countersigned by the Transfer Agent and
registered by the Registrar.

     Witness the signatures of its duly authorized officers.

Dated:
                                    Seal
/s/ Mark B. Chandler, President        Countersigned and Registered: ChaseMellon
/s/ Michael L. Bengtson, Secretary     Shareholder Services, L.L.C.
                                       Transfer Agent and Register

                                       By


                                       Authorized Signature
<PAGE>

LUMINEX CORPORATION

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM- as tenants in common            GIFT MIN ACT- _______ Custodian _______
TEN ENT- as tenant by the entireties                   (Cust)            (Minor)
JT TEN- as joint tenants with right of   Under the _____ Transfers to Minors Act
        survivorship and not as tenants           (State)
        in common

     Additional abbreviations may also be used though not in the above list.


     For value received, _______________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY NUMBER
OR OTHER IDENTIFYING NUMBER OF ASSIGNEE
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
________________________________________________________________________________
________________________________________________________________________________
common shares represented by the within Certificate, and do hereby irrevocably
constitute and appoint
________________________________________________________________________________
Attorney to transfer the said stock on the books of the within-named Corporation
with full power of substitution in the premises.

Dated _____________________


                                         X___________________________
                                              (Signature)
                                         X___________________________
                                              (Signature)

NOTICE: THE SIGNATURE(S) TO THIS  ASSIGNMENT
MUST CORRESPOND WITH THE NAME(S) AS WRITTEN
UPON THE FACE OF THIS CERTIFICATE IN EVERY PARTICULAR,
WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

This signature(s) must be guaranteed by an eligible guarantor institution
(Banks, Stockbrokers, Savings and Loan Associations and Credit Unions with
membership in an approved signature guarantee medallion program), pursuant to
S.E.C. rule 17Ag-15.

<PAGE>


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                                                                    Exhibit 23.2

CONSENT OF INDEPENDENT AUDITORS

We consent to the reference to our firm under the captions "Selected financial
data" and "Experts" and to the use of our report dated January 28, 2000, except
for Notes 4 and 10, as to which the date is March 9, 2000, in the Registration
Statement (Amendment No. 2 to Form S-1) and related Prospectus of Luminex
Corporation for the registration of shares of its common stock.

                                          /s/ Ernst & Young LLP

Austin, Texas

March 22, 2000

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