1. Department of Biology (E.H., C.D.C., S.L.P.), University of Massachusetts, Amherst, Massachusetts 01003
2. The Women’s Health Research Institute (P.J.S., I.M.), Wyeth-Ayerst Research, Radnor, Pennsylvania 19087
3. Department of Neurobiology (T.H., Z.S.L.), Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest, 1083 Hungary