UNIT PURCHASE AGREEMENT UNIT PURCHASE AGREEMENT (this "Agreement"), dated as of April 1, 1998, by and among HYBRIDON, INC., a Delaware corporation (the "Company") and the Persons listed on the signature pages hereof (the "Current Purchasers") and such...Unit Purchase Agreement • April 1st, 2002 • Hybridon Inc • Biological products, (no disgnostic substances) • New York
