Fig. 1. Melatonin signaling pathways on spermatogonial stem cells and Sertoli cell. GDNF, glial cell line-derived neurotrophic factor; ERS, endoplasmic reticulum stress; PI3K, phosphatidylinositol 3-kinase; GSH, glutathione; ROS, reactive oxygen species [
3,
35-
35].