AFFX Affymetrix, Inc.

Affymetrix to Host Live Webcast of Investor Day 2004 SANTA CLARA, Calif., Sept. 15 /PRNewswire-FirstCall/ -- Affymetrix, Inc. (NASDAQ:AFFX) today announced that it will broadcast its "Investor Day 2004" live over the Internet on Wednesday, September 22, 2004. Affymetrix' senior management team will provide an update on the Company's commercial operations and future initiatives. The live webcast will occur from 9:00 - 11:15 a.m. and 1:15 - 4:30 p.m. PDT on September 22 on the Investor Relations section of the site. To access the live webcast or archived presentation, please go to http://www.affymetrix.com/ and click on the "Investors" link. The archived webcast will be available through September 29, 2004. About Affymetrix Affymetrix is a pioneer in creating breakthrough tools that are driving the genomic revolution. By applying the principles of semiconductor technology to the life sciences, Affymetrix develops and commercializes systems that enable scientists to improve the quality of life. The Company's customers include pharmaceutical, biotechnology, agrichemical, diagnostics, and consumer products companies, as well as academic, government, and other non-profit research institutes. Affymetrix offers an expanding portfolio of integrated products and services, including its integrated GeneChip(R) brand platform to address the growing markets focused on understanding the relationship between genes and human health. Additional information on Affymetrix may be found at http://www.affymetrix.com/. 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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