The frequencies of HLA-A, -B, and -C antigens were studied in a tribal population of Koya from Andhra Pradesh in southern India. No other well-defined tribal population has been studied with which the present results may be compared. However, the HLA profile of Koya showed distinct differences from the general HLA distribution in India in the frequency of a large number of antigens both at the A and B loci. This study indicates the distinctiveness of this tribal population and suggests the potential importance of the study of HLA frequencies in tribal groups of India.

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