AFFX Affymetrix, Inc.

Affymetrix to Webcast Presentation at the Robert W. Baird 2005 Growth Stock Conference SANTA CLARA, Calif., May 3 /PRNewswire-FirstCall/ -- Affymetrix, Inc. (NASDAQ:AFFX) today announced that Greg Schiffman, Executive Vice President and CFO, will provide a company overview at the Robert W. Baird 2005 Growth Stock Conference at the Four Seasons Hotel in Chicago. A live transmission of the presentation will take place at 11:25 a.m. CDT/ 9:25 a.m. PDT on Tuesday, May 10, 2005. An archived webcast will be available for 30 days. A live webcast of the presentation can be accessed by visiting the Investor Relations section of the Company's website at http://www.affymetrix.com/. About Affymetrix Affymetrix scientists invented the world's first microarray in 1989 and began selling the first commercial microarray in 1994. Since then, Affymetrix GeneChip(R) technology has become the industry standard in molecular biology research. Affymetrix technology is used by the world's top pharmaceutical, diagnostic and biotechnology companies as well as leading academic, government and not-for-profit research institutes. More than 1,200 systems have been shipped around the world and nearly 3,000 peer-reviewed papers have been published using the technology. Affymetrix' patented photolithographic manufacturing process provides the most information capacity available today on an array, enabling researchers to use a whole-genome approach to analyze the relationship between genetics and health. Headquartered in Santa Clara, California, Affymetrix has subsidiaries in Europe and Asia in addition to manufacturing facilities in Sacramento, California and Bedford, Massachusetts. The Company has about 900 employees worldwide. DATASOURCE: Affymetrix, Inc. CONTACT: Doug Farrell, Vice President of Investor Relations of Affymetrix, Inc., +1-408-731-5285 Web site: http://www.affymetrix.com/

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