Animals Article animal 123 nonhuman 104 controlled study 99 animal experiment 77 human 63 metabolism 61 male 57 animal model 54 Humans 51 mouse 51 animal tissue 49 Mice 41 unclassified drug 38 Male 37 genetics 36 rat 33 female 31 in vivo study 31 animal cell 30 Rats 28 chemistry 25 drug effect 25 physiology 25 adult 24 pathology 24 human cell 23 signal transduction 23 gene expression 21