Animals animal article 1,648 nonhuman 1,410 physiology 1,400 metabolism 1,314 controlled study 1,008 male 1,004 female 990 Male 936 Female 896 genetics 846 Article 784 human 778 priority journal 770 Humans 720 Argentina 644 mouse 620 Mice 558 animal experiment 546 animal cell 534 chemistry 504 growth, development and aging 442 drug effect 424 unclassified drug 416 animal tissue 402 drug effects 378 classification 334 cytology 294 protein expression 292