Affiliation: | (1) Department of Microbiology, Mount Sinai School of Medicine, Fifth Avenue and 100th Street, 10029 New York, New York, USA;(2) Biological Science Center, Boston University, 2 Cummington Street, 02215 Boston, Massachusetts, USA;(3) Present address: Experimental Station, E.I. DuPont de Nemours & Co., E328/246A, 19898 Wilmington, DE, USA;(4) Present address: Biotechnical International Inc., 85 Bolton Street, 02140 Cambridge, Massachusetts, USA |