PURCHASE AGREEMENT ------------------ October 26, 2000 U.S. BANCORP PIPER JAFFRAY Piper Jaffray Tower 222 South Ninth Street Minneapolis, Minnesota 55402 Ladies and Gentlemen: Alexion Pharmaceuticals, Inc., a Delaware corporation (the "Company"),...Purchase Agreement • October 27th, 2000 • Alexion Pharmaceuticals Inc • Pharmaceutical preparations • Minnesota
