0001047469-99-024248 Sample Contracts

Exhibit 2.2 THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY APPLICABLE STATE SECURITIES LAWS, AND MAY NOT BE SOLD OR TRANSFERRED UNLESS SUCH SALE OR TRANSFER IS IN ACCORDANCE WITH THE REGISTRATION REQUIREMENTS...

Common Stock Purchase Warrant • June 15th, 1999 • Repligen Corp • Biological products, (no disgnostic substances) • Massachusetts

• Contract Type
  Common Stock Purchase Warrant
• Filed
  June 15th, 1999
• Company
  Repligen Corp
• Industry
  Biological products, (no disgnostic substances)
• Jurisdiction
  Massachusetts

ARTICLE I DEFINITIONS

Patent Purchase Agreement • June 15th, 1999 • Repligen Corp • Biological products, (no disgnostic substances) • Massachusetts

• Contract Type
  Patent Purchase Agreement
• Filed
  June 15th, 1999
• Company
  Repligen Corp
• Industry
  Biological products, (no disgnostic substances)
• Jurisdiction
  Massachusetts