1. Department of Pediatrics (H.J.N., M.L.S., A.W., S.R.), Division of Endocrinology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287
2. Department of Biology (G.H.), Morgan State University, Baltimore, Maryland 21251
3. School of Biological Sciences (Y.K.), Inje University, Gimhae, 621-749, South Korea
4. University of Illinois at Champaign-Urbana (C.K.), Champaign, Illinois 61820