Exhibit 4.2 ALEXION PHARMACEUTICALS, INC. STOCK OPTION AGREEMENT ---------------------- AGREEMENT made as of the ____ day of _________ 1998 by and between Alexion Pharmaceuticals, Inc., a Delaware corporation (the "Company") and (the "Optionee"). W I...Stock Option Agreement • February 8th, 1999 • Alexion Pharmaceuticals Inc • Pharmaceutical preparations • Delaware
