Reduced Intra-Cortical Estradiol Is Associated with Follicle Formation and Activation in Cortical Pieces from Bovine Fetal Ovaries and Fibroblast Growth Factor (FGF)-18 Regulates Fetal Ovarian Steroid Production In Vitro. - Yang, M. Y.; Bueno da Silva, R.; Buratini, J.; Fortune, J. E. (Soc Study Reproduction, 2011)