EXHIBIT 99.3 SECURITIES PURCHASE AGREEMENT DATED AS OF JULY 13, 2000Securities Purchase Agreement • August 7th, 2000 • Avant Immunotherapeutics Inc • In vitro & in vivo diagnostic substances • Massachusetts
Exhibit 99.4 REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT is made as of July 13, 2000, by and among Avant Immunotherapeutics, Inc., a Delaware corporation (the "Company"), and the Persons set forth on Schedule I attached hereto...Registration Rights Agreement • August 7th, 2000 • Avant Immunotherapeutics Inc • In vitro & in vivo diagnostic substances • Massachusetts
