1. From the Laboratory of Molecular Biology (S.H.M.), National Institute of Mental Health, Bethesda, Md; the Veterans Administration Medical Center and George Washington University (J.D.F.), Washington, DC; the LOCUS for Homocysteine and Related Vitamins (H.R., P.M.U.), Armauer Hansens hus, University of Bergen, Bergen, Norway; the Oregon Regional Primate Research Center (M.R.M.), Beaverton, and Oregon Health Sciences University, Portland; the Department of Internal Medicine (S.R.L.), University of...