Male male 102 Animals 86 physiology 86 animal 84 nonhuman 62 Article 53 animal experiment 53 female 53 Female 52 controlled study 52 human 43 Humans 37 adult 36 rat 34 animal tissue 32 metabolism 32 Rats 31 animal model 29 drug effect 26 mouse 23 article 21 Mice 19 animal cell 17 Disease Models, Animal 16 disease model 16 Rats, Sprague-Dawley 15 animal behavior 15 Adult 14 Sprague Dawley rat 14