SAN DIEGO, July 27, 2004 Read all today’s legal news, law firm news & law research at LAWFUEL
– Gen-Probe Incorporated
 (Nasdaq: GPRO) announced today that the U.S. District Court for the Southern
 District of New York has granted summary judgment in Gen-Probe’s favor in a
 patent infringement lawsuit initiated by Enzo Biochem, Inc.
The Court ruled that the patent on which Enzo’s lawsuit was based is
 invalid, and therefore dismissed Enzo’s infringement claims against Gen-Probe
 and its co-defendant, Becton Dickinson.
Enzo filed the infringement lawsuit in June 1999.  Enzo alleged that
 Gen-Probe and Becton Dickinson willfully infringed U.S. patent no. 4,900,659
 through the manufacture and sale of products for the diagnosis of gonorrhea.
About Gen-Probe
 Gen-Probe Incorporated is a global leader in the development, manufacture
 and marketing of rapid, accurate and cost-effective nucleic acid testing
 products used for the clinical diagnosis of human diseases and for screening
 donated human blood.  Using its patented NAT technologies, Gen-Probe has
 received FDA approvals or clearances for a broad portfolio of products that
 detect a variety of infectious microorganisms, including those causing
 sexually transmitted diseases, tuberculosis, strep throat, pneumonia and
 fungal infections.  Additionally, the Company developed and manufactures the
 only FDA-approved blood screening assay for the simultaneous detection of
 HIV-1 and HCV, which is marketed by Chiron Corporation.  Gen-Probe has
 20 years of nucleic acid detection research and product development
 experience, and its products are used daily in clinical laboratories and blood
 collection centers throughout the world.  Gen-Probe is headquartered in San
 Diego, California and has nearly 800 employees.  Additional information about
 the Company can be found at http://www.gen-probe.com.
Caution Regarding Forward-Looking Statements
 Any statements in this press release about our expectations, beliefs,
 plans, objectives, assumptions or future events or performance are not
 historical facts and are forward-looking statements.  These statements are
 often, but not always, made through the use of words or phrases such as
 “believe,” “will,” “expect,” “anticipate,” “estimate,” “intend,” “plan,” and
 “would.”  For example, statements concerning financial condition, possible or
 assumed future results of operations, growth opportunities, industry ranking,
 plans and objectives of management, markets for our common stock and future
 management and organizational structure are all forward-looking statements.
 Forward-looking statements are not guarantees of performance.  They involve
 known and unknown risks, uncertainties and assumptions that may cause actual
 results, levels of activity, performance or achievements to differ materially
 from those expressed or implied by any forward-looking statement.  For
 example, there can be no assurance that Enzo will not appeal this summary
 judgment, or that the case will ultimately be resolved in the Company’s favor.
 The foregoing list sets forth some, but not all, of the factors that could
 affect our ability to achieve results described in any forward-looking
 statements.  For additional information about risks and uncertainties we face
 and a discussion of our financial statements and footnotes, see documents we
 have filed with the SEC, including our Report on Form 10-K for the fiscal year
 ended December 31, 2003 and all our periodic filings made with the SEC.  We
 assume no obligation and expressly disclaim any duty to update any forward-
 looking statement to reflect events or circumstances after the date of this
 news release or to reflect the occurrence of subsequent events.