Methods Polymerase chain reaction(PCR)and 2% agarose gel electrophoresis were used to analyze the genetic polymorphism of 334 unrelated males from the six ethnic populations.

• 方法采用聚合酶链式反应(PCR)和琼脂糖凝胶电泳检测方法,对上述六群体334份男性血样本的遗传多态性进行分析。