EXHIBIT 4.2 ANTIGENICS INC. REGISTRATION RIGHTS AGREEMENT January 25, 2005 REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT (the "Agreement") is made and entered into as of January 25, 2005, by and among Antigenics Inc., a Delaware...Registration Rights Agreement • January 25th, 2005 • Antigenics Inc /De/ • Biological products, (no disgnostic substances) • New York
