1 Exhibit 10.28 STOCK PURCHASE AGREEMENT The Medicines Company One Cambridge Center Cambridge, Massachusetts 02142 Ladies & Gentlemen: The undersigned, _________________________________(the "Investor"), hereby confirms its agreement with you as...Stock Purchase Agreement • May 23rd, 2001 • Medicines Co/ Ma • Pharmaceutical preparations • Delaware
1 EXHIBIT 10.20 STOCK PURCHASE AGREEMENT Incyte Pharmaceuticals, Inc. 3174 Porter Drive Palo Alto, California 94304 The undersigned (the "Investor"), hereby confirms its agreement with you as follows: 1. This Stock Purchase Agreement (the "Agreement")...Stock Purchase Agreement • March 22nd, 2000 • Incyte Pharmaceuticals Inc • Services-commercial physical & biological research • California
STOCK PURCHASE AGREEMENT Alexion Pharmaceuticals, Inc. 25 Science Park New Haven, CT 06511 Ladies & Gentlemen: The undersigned, ________________________ (the "Investor"), hereby confirms its agreement with you as follows: 1. This Stock Purchase...Stock Purchase Agreement • June 19th, 1997 • Alexion Pharmaceuticals Inc • Pharmaceutical preparations • Delaware