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1·Methods Single round Touchdown PCR (TD PCR) and restriction fragment length polymorphism (RFLP) method were used for genotyping in 110 people from the Han population in Chongqing.

方法对110名重庆汉族个体，采用降落式PCR和限制性片段长度多态性法（RFLP）进行基因型分析。