Animals Mice animal experiment male nonhuman 228 priority journal mouse 217 controlled study 205 Male 193 article 176 animal tissue 137 animal model 132 animal cell 105 female 83 animal 77 Female 70 protein expression 67 metabolism 56 Article 54 Mice, Inbred C57BL 52 Mice, Knockout 47 Humans 42 gene expression 39 in vivo study 39 genetics 38 drug effect 37 in vitro study 37 human 36 Mice, Inbred BALB C 35 unclassified drug 33