5 EXHIBIT 10.22 PURCHASE AGREEMENT This PURCHASE AGREEMENT (the "Agreement") is made and entered into as of June 21, 1999, by and among Dr. Harvey Wm. Glasser ("Glasser") and Cistron Biotechnology, Inc., a Delaware corporation ("Cistron"). W I T N E S...Purchase Agreement • July 15th, 1999 • Cistron Biotechnology Inc • In vitro & in vivo diagnostic substances • Delaware
Exhibit 10.23 PURCHASE AGREEMENT ------------------ This PURCHASE AGREEMENT (the "Agreement") is made and entered into as of June 30, 1999, by and among the Bankruptcy Estate of Dr. Henry Grausz (the "Estate") and Cistron Biotechnology, Inc., a...Purchase Agreement • July 15th, 1999 • Cistron Biotechnology Inc • In vitro & in vivo diagnostic substances • Delaware
