Exhibit 4.1 FORM OF WARRANT THIS WARRANT IS SUBJECT TO THE RESTRICTIONS ON TRANSFER SET FORTH IN SECTION 5 OF THIS WARRANTWarrant Agreement • April 15th, 2004 • Hybridon Inc • Biological products, (no disgnostic substances) • Delaware
Exhibit 1.1 HYBRIDON, INC. PLACEMENT AGENCY AGREEMENT April 15, 2004 PLACEMENT AGENCY AGREEMENTPlacement Agency Agreement • April 15th, 2004 • Hybridon Inc • Biological products, (no disgnostic substances) • New York
