animal article human Animals 269 Humans 249 metabolism 140 nonhuman 140 controlled study 117 physiology 112 mouse 96 Mice 92 chemistry 85 female 78 animal cell 76 genetics 74 Female 72 priority journal 72 human cell 69 unclassified drug 68 drug effect 67 male 61 Male 55 animal experiment 52 Argentina 49 cell culture 47 protein expression 42 pathology 41 isolation and purification 40 rat 40 Rats 38