Male female male 182 metabolism Female 174 animal 140 Animals 128 controlled study 96 nonhuman 78 Article 76 priority journal 75 adult 68 human 66 article 63 physiology 62 genetics 61 Humans 60 animal experiment 50 animal cell 41 drug effects 41 mouse 35 protein expression 34 Mice 33 animal tissue 33 Adult 32 gene expression 32 unclassified drug 32 chemistry 28 cytology 28 pathology 28