Animals 198 animal article controlled study physiology nonhuman 192 metabolism 132 priority journal 122 animal experiment 94 drug effect 84 mouse 82 animal cell 80 Mice 76 animal tissue 66 male 64 female 62 unclassified drug 58 Male 54 human 54 rat 54 Rats 52 Humans 50 Female 46 cytology 46 genetics 46 protein expression 38 animal model 28 biosynthesis 28 cell culture 28 chemistry 28