Epididymis Male 54 epididymis 52 article 38 male 34 nonhuman 32 rat 32 Rats 30 male genital system 28 priority journal 28 Animal 26 Spermatozoa 26 Support, Non-U.S. Gov't 26 animal cell 24 Female 20 animal experiment 20 Fertilization 18 female 18 spermatozoon 18 Animals 16 Testosterone 16 endocrine system 16 fertilization 16 human 16 human cell 16 radioisotope 16 unclassified drug 16 controlled study 14 in vitro study 14 spermatozoon capacitation 14