Male animal experiment animal model controlled study male nonhuman Animals 222 article 176 priority journal 161 Mice 155 mouse 154 animal tissue 128 animal cell 95 animal 71 protein expression 66 rat 57 female 56 Rats 55 Article 52 metabolism 52 Female 48 unclassified drug 46 Humans 44 in vivo study 42 drug effect 39 human 38 in vitro study 36 pathology 34 Disease Models, Animal 32 Mus 32