Objective: To investigate the relationship of the methylenetetrahydrofolate reductase (MTHFR) gene C677T polymorphism with male infertility in Northeast of China.

• 摘要目的：探讨亚甲基四氢叶酸还原酶(MTHFR)基因C677T多态性与中国东北人群男性不育的关系。