animal controlled study drug effect priority journal Animals 134 nonhuman 130 metabolism 104 article 100 animal cell 84 animal experiment 72 physiology 66 mouse 62 Mice 60 animal tissue 53 male 50 Male 48 female 46 genetics 45 rat 45 Rats 41 protein expression 40 Article 38 Female 38 unclassified drug 34 Humans 30 animal model 30 human 30 signal transduction 30 in vitro study 28 cell proliferation 24