1. Contribution from the Department of Biochemistry, School of Medicine, Vanderbilt University, Nashville, Tennessee 37232, Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada, Alta Scuola Pedagogica, CH-6600 Locarno, Switzerland, Department of Molecular Pharmacology and Biological Chemistry, School of Medicine, Northwestern University, Chicago, Illinois 60611, Biographics Laboratory 3R, CH-4056 Basel, Switzerland, Department of Chemistry and Biochemistry,...