EXHIBIT 4.1 SECOND AGREEMENT AND AMENDMENT TO RIGHTS AGREEMENT This SECOND AGREEMENT AND AMENDMENT TO RIGHTS AGREEMENT (this "Amendment") is being entered into as of June 20, 2003, between Biogen, Inc., a Massachusetts corporation (the "Company"), and...Second Agreement • June 23rd, 2003 • Biogen Inc • Biological products, (no disgnostic substances) • Massachusetts
AGREEMENT AND PLAN OF MERGER BY AND AMONG IDEC PHARMACEUTICALS CORPORATION, BRIDGES MERGER CORPORATION AND BIOGEN, INC. DATED AS OF JUNE 20, 2003Agreement and Plan of Merger • June 23rd, 2003 • Biogen Inc • Biological products, (no disgnostic substances) • Delaware
THIS AGREEMENT AND PLAN OF MERGER (this “Agreement”) is made and entered into as of June 20, 2003, by and among IDEC PHARMACEUTICALS CORPORATION, a Delaware corporation (“IDEC”), BRIDGES MERGER CORPORATION, a Massachusetts corporation and a direct wholly owned subsidiary of IDEC (“Merger Sub”), and BIOGEN, INC., a Massachusetts corporation (“Biogen”).
