Animals animal controlled study physiology nonhuman 386 metabolism 257 priority journal 232 Article 218 animal experiment 217 male 182 article 179 animal tissue 164 animal cell 155 Male 152 mouse 152 female 142 Mice 122 Female 105 drug effect 94 unclassified drug 93 genetics 92 human 84 protein expression 81 adult 79 Humans 76 drug effects 75 rat 71 cytology 70 animal model 66 Rats 59