1. Departments of Microbiology (C.L.S., L.-H.W.), Mount Sinai School of Medicine, New York, New York 10029
2. Dairy Science Group (T.T.W.), AgResearch, Hamilton, Private Bag 3123 New Zealand
3. Biochemistry and Molecular Biology (H.B.S.), Mount Sinai School of Medicine, New York, New York 10029