1 Exhibit 4.1 REGISTRATION RIGHTS AGREEMENT This Registration Rights Agreement (this "Agreement") is made and entered into as of September 29, 2000 among Alteon Inc., a Delaware corporation (the "Company"), and each of the purchasers executing this...Registration Rights Agreement • October 5th, 2000 • Alteon Inc /De • Pharmaceutical preparations • New York
2 3 Warrant on such date. Until the Current Warrant Price is adjusted pursuant to the terms herein, the initial Current Warrant Price shall be $3.40 per share.Warrant Agreement • October 5th, 2000 • Alteon Inc /De • Pharmaceutical preparations • New York
AMONG ALTEON INC. ANDCommon Stock and Warrants Purchase Agreement • October 5th, 2000 • Alteon Inc /De • Pharmaceutical preparations • New York
