Exhibit 99.7 FORM OF WARRANT THIS WARRANT AND THE WARRANT SHARES SHALL NOT BE SOLD OR TRANSFERRED EXCEPT (A) IN ACCORDANCE WITH THE PROVISIONS OF REGULATION S UNDER THE SECURITIES ACT OF 1933, (B) PURSUANT TO REGISTRATION UNDER THE SECURITIES ACT OF...Warrant Agreement • October 8th, 2004 • Zein Youssef El • Biological products, (no disgnostic substances) • Delaware
HYBRIDON, INC.Registration Rights Agreement • October 8th, 2004 • Zein Youssef El • Biological products, (no disgnostic substances) • Delaware
Exhibit 99.4 SUBSCRIPTION AGREEMENT (Non-U.S. Investor) Hybridon, Inc. 345 Vassar Street Cambridge, MA 02139 Gentlemen: 1. Subscription. The undersigned (the "Purchaser"), intending to be legally bound, hereby irrevocably agrees to purchase from...Subscription Agreement • October 8th, 2004 • Zein Youssef El • Biological products, (no disgnostic substances) • Massachusetts
