Animals animal 152 female male metabolism Male 128 Female 122 nonhuman 98 controlled study 89 Article 72 priority journal 71 physiology 68 animal experiment 60 animal tissue 53 genetics 52 animal cell 51 drug effects 47 mouse 47 adult 46 Mice 45 article 43 cytology 34 gene expression 32 protein expression 30 human 26 Cichlids 25 cichlid 25 in vitro study 25 reproduction 25 Humans 24