AltaGen Bioscience Received Fastest Growing Private Companies Award.

AltaGen Bioscience, a developer of biotechnology products, received the Business Journals 2003 Fastest Growing Private Companies Award.

MORGAN HILL, CA - October 23, 2003 -- AltaGen Bioscience ranked 16th out of 39 fastest growing companies in Silicon Valley. The ranking was based on three criteria: the companies must be headquartered in Silicon Valley; they must be privately held; and they must have at least a three-year sales history with an increase in year 2002.

AltaGen Bioscience is developing therapeutic monoclonal antibodies and recombinant versions of tissue-derived products and reagents used in the manufacture of biopharmaceuticals in cell culture. Its partners include public and private biotechnology companies ranging from well-known multinational corporations to start-up biotechnology firms as well as academic and government institutions.

"We're pleased to be recognized for the steady growth we've achieved for the past ten years in the biotechnology industry," said Rick Srigley, President and CEO of AltaGen Bioscience. "This recognition highlights the dedicated efforts of AltaGens employees in serving the custom product development needs of our partners."

About AltaGen Bioscience, Inc.
AltaGen Bioscience develops and produces biotechnology products. Through its subsidiary, Sierra BioSource, Inc., it also provides customized research and development services to client companies in the areas of cell and molecular biology, immunology, pharmacology, cell culture, purification and process development, and production of monoclonal antibodies and recombinant proteins. AltaGen is a privately held corporation with headquarters in Morgan Hill, California. For further information about the company and its products, visit www.altagenbioscience.com or call 408-779-4533.