Methods Polymerase chain reaction-sequence specific primers (PCR-SSP) were used to determine HLA-A, HLA-B, HLA-DR alleles in 2000 unrelated healthy Han individuals of North China.

• 方法应用聚合酶链反应-序列特异性引物(PCR-SSP)方法对2000名北方汉族健康志愿者进行A、B、DR等位基因分型。