Animals 152 Article animal controlled study human Humans 146 nonhuman 144 metabolism 102 animal cell 84 mouse 82 priority journal 80 animal experiment 76 unclassified drug 70 Mice 68 human cell 68 genetics 62 female 58 male 52 protein expression 52 drug effects 50 animal model 48 pathology 48 Female 46 Male 44 chemistry 42 in vitro study 42 in vivo study 40 adult 32 animal tissue 32 gene expression regulation 32