gonadotropin blood level nonhuman 10 animal experiment 8 article 8 female 8 gonadotropin 8 priority journal 8 Female 6 animal tissue 6 controlled study 6 protein expression 6 Animals 4 Gonadotropins 4 Ovary 4 Rats 4 Rats, Sprague-Dawley 4 animal cell 4 apoptosis 4 cell proliferation 4 chorionic gonadotropin 4 cycline 4 drug efficacy 4 leuprorelin 4 male 4 rat 4 reverse transcription polymerase chain reaction 4 steroidogenesis 4 steroidogenic acute regulatory protein 4 Angiogenesis 2 Angiopoietin-1 2