animal controlled study Animals 1,008 nonhuman 960 metabolism 680 Article 580 priority journal 552 animal experiment 496 animal cell 456 article 436 physiology 418 mouse 412 female 372 Mice 362 male 362 animal tissue 358 genetics 316 Male 310 unclassified drug 304 Female 300 human 290 Humans 270 drug effects 250 protein expression 238 animal model 210 drug effect 210 chemistry 192 adult 162 in vitro study 156 rat 152