animal experiment animal model controlled study nonhuman 559 priority journal article 447 Animals 443 mouse 386 animal tissue 318 Mice 312 female 278 animal cell 270 male 239 Female 222 Male 185 protein expression 185 rat 139 animal 131 unclassified drug 120 Mice, Inbred BALB C 118 Humans 115 Rats 110 Article 108 metabolism 106 human 105 in vivo study 97 cell proliferation 90 in vitro study 88 enzyme activity 84 Mice, Inbred C57BL 72