1. Bourne Behavioral Research Laboratory, Department of Psychiatry, New York-Presbyterian Hospital-Weill Medical College of Cornell University (N.G., L.A.), White Plains, New York 10605
2. Laboratory of Reproductive and Developmental Toxicology, National Institute of Environmental and Health Sciences (K.S.K.), Research Triangle Park, North Carolina 27709
3. Laboratory of Neurobiology and Behavior, Rockefeller University (D.K., S.O.), New York, New York 10021