1. Departments of Pharmacology, University of Colorado, Health Sciences Center, 4200 E. 9th Ave., Denver, CO 80262, USA
2. Veterans Administration Medical Center, 1055 Clermont St., Denver, CO, 80220, USA
3. Michigan Mental Research Institute, Ann Arbor, MI, USA
4. Department of Neurobiology, Allegheny University, 3200 Henry Ave., Philadelphia, PA, USA
5. Department of Pharmacology, Ohio State University, 333 W. 10thAve., Columbus, OH 43210-1239, USA
6. Psychiatry, University of Colorado, Health Sciences Center, 4200 E. 9th Ave., Denver, CO 80262, USA
7. Neuroscience Discovery, Bristol-Myers Squibb Company, 5 Research, Parkway, Wallington, CT 06492, USA