The major histocompatibility complex is the subject of much research in the immunology area. There is great interest in the structure of MHC proteins and in their function as antigen presenting molecules. Many immunology labs are now faced with the prospect of tackling biochemical and genetic techniques in order to study these molecules, and these two Practical Approach volumes provide the ideal introduction. MHC 1, Antigen Processing and Presentation, is complemented by MHC 2, Genes, Cells, and Molecules.