The Major Histocompatibility Complex of Rhesus Monkeys, RhL—A. VII. Identification of Five New Serologically Defined Antigens*

Five new serologically defined (SD) tissue antigens of rhesus monkeys are described. Results of a population study and a segregation analysis in families were consistent with their control by the major histocompatibility complex (MHC), as alleles of the two previously established SD loci of RhL‐A. The number of identifiable SD specificities of the rhesus monkeys'MHC is now twenty‐five, thirteen controlled by the SD 1 locus and twelve by SD 2 . The recombination frequency between SD 1 and SD 2 is estimated to be 0.3%. No evidence of a third SD series, as analogue of the human HLA—C locus, has yet been found.