EXHIBIT 4.3 MASTER LOAN AND SECURITY AGREEMENT THIS AGREEMENT dated as of July 15, 1998, is made by Aquila Biopharmaceuticals, Inc. (the "Borrower"), a Delaware corporation having its principal place of business and chief executive office at 175...Master Loan and Security Agreement • March 23rd, 1999 • Aquila Biopharmaceuticals Inc • In vitro & in vivo diagnostic substances • Illinois
