Frequencies of HLA alleles of Caucasoid origin (A3, B8 and others) decrease eastwards and southwards, and those of HLA alleles of Southeast Asia Mongoloid origin (B46 and others) decrease northwards.

• 高加索人种起源的HLA抗原基因频率(A3、B8等)由西向东又由北向南递减。 东南亚蒙古人种起源的HLA抗原基因频率(B46等)由南向北递减。