LOU Shir Jie, GU Ping, XU He , XU Xiao Hui, WANG Ming Wei, He Cheng, Lu Changlin. Effect of tumor necrosis factor a on differerntiation of mesencephalic neural stem cells and proliferation of oligodendrocytes in the rat. Acta Physiol Sin 2003; 55 (2): (in Chinese with English abstract).