Institution: | (1) Present address: National Tritium Labelling Facility and Structural Biology Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, 94720 Berkeley, CA, U.S.A.;(2) Department of Chemistry, University of California, 93106 Santa Barbara, CA, U.S.A.;(3) College of Pharmacy, University of Michigan, 48109-1065 Ann Arbor, MI, U.S.A. |