animal animal experiment article nonhuman 199 Animals 179 controlled study 168 metabolism 155 priority journal 121 mouse 108 female 106 Mice 104 Female 100 male 100 drug effect 97 physiology 97 Male 92 rat 88 animal cell 87 animal model 86 Rats 84 animal tissue 77 unclassified drug 71 Animal 68 genetics 62 in vitro study 53 human 52 protein expression 47 Humans 43 Support, Non-U.S. Gov't 40 pathology 40