EXHIBIT 4.1 AMENDMENT TO RIGHTS AGREEMENT BETWEEN COULTER PHARMACEUTICAL, INC. AND CHASEMELLON SHAREHOLDER SERVICES, L.L.C. THIS AMENDMENT TO RIGHTS AGREEMENT (the "Amendment") is made as of October 15, 2000, by and between COULTER PHARMACEUTICAL,...Rights Agreement • October 16th, 2000 • Coulter Pharmaceuticals Inc • Pharmaceutical preparations • Delaware
BY AND AMONGMerger Agreement • October 16th, 2000 • Coulter Pharmaceuticals Inc • Pharmaceutical preparations • Delaware
