1. Department of Chemistry, Center of Membrane Sciences, and Sanders-Brown Center on Aging, University of Kentucky, Lexington, Kentucky.
2. Department of Biochemical Sciences, Sapienza University of Rome, Rome, Italy.
3. Department of Pharmacology, Boston University, Boston, Massachusetts.
4. Institute of Pharmacology, Catholic University of Rome, Rome, Italy.
5. Department of Pharmacology, University of Louisville, Louisville, Kentucky.
6. Ariad Pharmaceuticals, Cambridge, Massachusetts.
7. Department of Biology, University of Milan, Milan, Italy.
8. Edith Nourse Rogers Memorial Veterans Affairs Medical Center, Bedford, Massachusetts.