The major histocompatibility complex of Rhesus monkeys IX. Current concepts of serology and genetics of Ia antigens.

Eleven Ia or B-cell specificities of rhesus monkeys have been serologically identified. They are probably all controlled by the RhLa complex, but, according to results of a large population and family study, only five or six can be placed in a segregant series, designated as Ia1. Data from recombinant offspring in two rhesus families place the Ia1 locus in the close vicinity of the D or major MLC locus within RhLA. The genetic control of the Ia antigens not defined by the Ia1 locus has not yet been clarified.