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Dow AgroSciences and Exelixis achieve milestones in discovery collaboration -- Four targets identified in new approach to crop protection

South San Francisco, California
November 29,  2001

Crop protection targets identified by scientists at Exelixis, Inc. (Nasdaq: EXEL) for Indianapolis-based Dow AgroSciences LLC could lead to the development of more effective products to control weeds and fungal diseases of plants.

Four targets, delivered to Dow AgroSciences under the companies' one-year- old collaboration, were discovered through Exelixis' proprietary Mechanism of Action (MOA) technology, which identifies the molecular target of biologically active compounds -- in this case herbicidal and fungicidal compounds provided by Dow AgroSciences. The identification of these targets triggers undisclosed milestone payments to Exelixis.

"We are pleased with the productivity of this collaboration and are eager to move these targets forward to the next phase of lead discovery," said Dan Kittle, vice president of Ag Chem and Urban Pest R&D at Dow AgroSciences. "Our commitment to this relationship was strengthened earlier this year by expansion of the research program at Exelixis. Dow AgroSciences is confident that this collaboration will continue to efficiently identify high quality targets, which will enable us to speed the discovery and development of new fungicides and herbicides of value to agriculture."

"Our collaboration with Dow AgroSciences is a powerful demonstration of the speed and productivity of our MOA technology in identifying the molecular targets of biologically active compounds," said George A. Scangos, Ph.D., president and chief executive officer of Exelixis, Inc. "Agriculture is a valuable part of our discovery research at Exelixis, and we look forward to continued success in delivering novel fungicide and herbicide targets in this collaboration."

Dow AgroSciences LLC, based in Indianapolis, Indiana, USA, is a global leader in providing pest management and biotechnology products that improve the quality and quantity of the earth's food supply and contribute to the safety, health and quality of life of the world's growing population. Dow AgroSciences has approximately 6,000 people in over 50 countries dedicated to its business, and has world-wide sales of more than US $3 billion. Dow AgroSciences is a wholly-owned subsidiary of The Dow Chemical Company. For more information about Dow AgroSciences, visit www.dowagro.com .

Exelixis, Inc. is a leading genomics-based drug discovery company focused on product development through its expertise in comparative genomics and model system genetics. These technologies provide a rapid, efficient and cost effective way to move from DNA sequence data to knowledge about the function of genes and the proteins they encode. The company's technology is broadly applicable to all life sciences industries including pharmaceutical, diagnostic, agricultural biotechnology and animal health. Exelixis has partnerships with Aventis CropScience S.A., Bayer Corporation, Bristol-Myers Squibb Company, Elan Pharmaceuticals, Inc., Pharmacia Corporation, Protein Design Labs, Inc., Scios Inc. and Dow AgroSciences LLC, and is building its internal development program in the area of oncology. For more information, please visit the company's web site at www.exelixis.com.


Exelixis and the Exelixis logo are registered U.S. trademarks.

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