- National Institute of Child Health and Development.- Evolutionary Insights from Reptilian Sexual Differentiation.- Sexual Differentiation in Marsupials.- Antiquity of the Genetic Mechanism of Sex Determination and the Immortality of the Primary Sex Determining Gene.- Searches for Human H-Y by Conventional Means, and How it all Began.- Serological Analysis of H-Y Antigen.- Immunogenetic Analysis of the H-Y Antigen.- Sex Determination and H-Y Antigen in Mice.- Genes on the Human Y Chromosome.- The Detection of Y DNA in Intersex Subjects with Mosaicism for a Y Cell Line.- Evidence that the X-Y Pairing/Recombination Region May be Involved in tda-1 Inherited Sex Reversal.- Centromeric Alphoid DNA on the Y Chromosome.- Do BKM Sequences Play a Role in Human Sex Determination?.- Localization of a Gene for the Male Enhanced Antigen on Human and Mouse Chromosomes.- Abbreviations.- Contributors.