This one-stop reference for researchers contains overview chapters and entries on leucocyte antigens. Introductory material reviews the discovery and biochemical analysis of leucocyte surface antigens, protein superfamilies and cell surface molecules, and the architecture and interactions of leucocyte surface molecules. Entries on antigens provide information on molecular weights, human gene location and size, tissue distribution, structure, ligands and associated molecules, function, amino acid sequences, and database accession numbers. Entries also contain comments and references. This second edition is revised and contains about 70 new entries. A chapter on gene locations has been deleted. Includes a color poster.