animal tissue male nonhuman 267 priority journal controlled study 223 article 213 Animals 189 animal experiment 182 Male 178 mouse 103 female 96 animal cell 89 rat 87 Mice 82 animal model 77 Female 63 animal 62 Rats 59 protein expression 54 Article 51 enzyme activity 47 metabolism 47 unclassified drug 44 physiology 36 Rats, Sprague-Dawley 34 messenger RNA 34 Animalia 32 Immunohistochemistry 28 adult 28 drug effect 28