animal experiment controlled study mouse nonhuman Animals 625 Mice 601 priority journal 576 article 564 animal model 556 animal tissue 420 animal cell 371 male 365 female 355 Female 280 Male 277 animal 255 protein expression 248 Article 218 metabolism 210 unclassified drug 204 human 184 Mice, Inbred BALB C 180 Humans 179 in vivo study 135 Mice, Inbred C57BL 133 enzyme activity 125 in vitro study 124 signal transduction 119 human cell 118 cell proliferation 116