Animals Female Male animal 120 female 120 male 120 metabolism nonhuman 66 controlled study 59 physiology 52 priority journal 51 Article 48 genetics 42 animal experiment 38 adult 36 article 35 animal cell 31 mouse 31 gene expression 30 Mice 29 animal tissue 29 drug effects 29 cytology 24 protein expression 24 chemistry 20 reproduction 19 immunohistochemistry 18 unclassified drug 18 Cichlids 17 Reproduction 17