Down regulating PHGDH affects the lactate production of sertoli cells in varicocele oleh Wen-bin Guo, Zhen-hui Huang, Cheng Yang, Xian-yuan Lv, Hui Xia, Hu Tian, Jian-kun Yang, Qi-zhao Zhou, Ming-kun Chen, Kang-yi Xue, Cun-dong Liu