From the Departments of Medicine (F.R., L.Z., K.Z., G.W., B.P.K., M.D., J.L.R.-F., P.E.C., R.M.S., S.K.M., L.T., M.G.Z., D.T.O.), Pharmacology (D.T.O.), Psychiatry (J.W., B.K.R., N.J.R.), and Biology (D.W.S.) and the Center for Human Genetics and Genomics (N.J.S., D.T.O.), University of California at San Diego, and the VA San Diego Healthcare System (S.K.M., D.T.O.), San Diego, Calif. (At 2007-08-28)