Contents. List of Contributors. Preface (P.M. Wassarman). The Sry Gene and Sex Determination in Mammals (B. Chapel and R. Lovell-Badge). Molecular and Genetic Studies of Human X Chromosome Inactivation (C.J. Brown and H.F. Willard). Genomic Imprinting in the Regulation of Mammalian Development (C.L. Stewart). Cell Interactions in Neural Crest Cell Migration (M. Bronner-Fraser). Enzymes and Morphogenesis: Alkaline Phosphatase and Control of Cell Migration (S.L. Zackson). Index.