1. Molecular Neuroendocrinology Unit, Rowett Research Institute (J.V.F., P.B., P.J.M.), Bucksburn, Aberdeen, Scotland AB21 9SB, United Kingdom
2. the Section on Neuroendocrinology, Laboratory of Developmental Neurobiology, National Institute of Child Health and Human Development, National Institutes of Health (S.L.C., D.C.K.), Bethesda, Maryland 20892-4480