Animals animal controlled study priority journal nonhuman 517 metabolism 379 Article 310 animal experiment 287 animal cell 282 mouse 259 physiology 232 animal tissue 224 Mice 223 article 219 male 213 female 201 Male 181 genetics 180 Female 167 unclassified drug 147 drug effects 139 protein expression 138 human 137 animal model 135 drug effect 134 Humans 133 signal transduction 101 cytology 98 chemistry 97 in vitro study 95