Chorionic Gonadotropin nonhuman 44 article 40 chorionic gonadotropin 40 priority journal 38 Animals 34 Female 32 animal experiment 32 Rats 26 controlled study 26 rat 26 Male 24 animal cell 22 steroidogenesis 22 Humans 20 human 20 progesterone 20 testosterone 20 Cyclic AMP 18 Progesterone 18 Testis 18 Testosterone 18 animal tissue 18 luteinizing hormone 18 protein expression 18 Animal 16 Ovary 16 Support, Non-U.S. Gov't 16 female 16 Luteinizing Hormone 14