Article animal cell 140 animal experiment nonhuman 140 controlled study 134 animal tissue 91 male 89 animal model 88 Animals 83 animal 83 mouse 83 female 63 unclassified drug 50 metabolism 48 human 47 rat 40 protein expression 38 in vivo study 36 Mice 35 adult 35 Male 34 Humans 33 gene expression 30 genetics 30 in vitro study 29 drug effect 27 human cell 27 Female 24 Rats 22 Western blotting 21