1. Department of Biological Chemistry, Medical Chemistry and Molecular Biology, University of Catania, Italy.
2. Department of Clinical and Experimental Medicine, Clinica Medica 5, University and Azienda Ospedaliera of Padova, Padova, Italy.
3. Departments of Biochemistry and Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX.
4. Department of Chemistry, University of Catania, Italy.
5. Department of Pharmacology, New York Medical College, Valhalla, NY.
6. The Rockefeller University, New York, NY.