Frequencies of HLA alleles of Caucasoid origin (A3, B8 and others) decrease eastwards and south wards, and those of HLA alleles of Southeast Asia Mongoloid origin(B46 and other s)decrease north wards.

• 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。