controlled study female male metabolism nonhuman animal 91 Animals 89 priority journal 71 Article 70 Male 69 animal experiment 64 Female 63 animal cell 53 animal tissue 51 adult 44 mouse 43 physiology 41 drug effects 39 genetics 38 Mice 37 protein expression 29 animal model 26 article 25 in vitro study 23 gene expression 22 unclassified drug 22 cytology 21 Cichlasoma dimerus 20 Cichlids 20 cichlid 20