1. Department of Biochemistry University of Nebraska College of Medicine, 42nd and Dewey Avenue, Omaha, Nebraska 68105 and Veterans Administration Hospital, 4101 Woolworth Avenue, Omaha, Nebraska 68105
2. Department of Medicine, University of Nebraska College of Medicine, 42nd and Dewey Avenue, Omaha, Nebraska 68105 and Veterans Administration Hospital, 4101 Woolworth Avenue, Omaha, Nebraska 68105