CONFIDENTIAL Exhibit 2.1 CONFIDENTIAL TREATMENT REQUESTED CONFIDENTIAL TREATMENT REQUESTED: PAGES WHERE CONFIDENTIAL TREATMENT HAS BEEN REQUESTED ARE MARKED "CONFIDENTIAL TREATMENT REQUESTED" AND APPROPRIATE SECTIONS, WHERE TEXT HAS BEEN OMITTED, ARE...Purchase and Sale of Assets Agreement • March 30th, 1999 • Trega Biosciences Inc • Biological products, (no disgnostic substances) • California
