Objective To investigate the genetic polymorphism of HLA-B locus in Guangdong Han population and compare the characteristic of the allele frequency distribution with that in other populations.
目的调查广东汉族人群HLA-B位点基因多态性，比较不同人群HLA-B等位基因频率分布特征。
2
Objective To investigate the polymorphism on HLA-A locus of Bama longevous people and its association with longevity.
目的了解巴马地区壮族长寿老人HLA-A基因座位的多态性特点，探讨HLA与长寿的相关性。
3
Objective To observe and analyse the dynamic changes of engraftment status after transplantation of mixed umbilical cord blood from two units HLA one locus mismatched.