male metabolism Male 77 human 60 Humans 58 Article 54 controlled study 54 Animals 52 animal 52 female 42 Female 39 nonhuman 35 animal experiment 33 genetics 33 adult 31 animal model 28 pathology 28 mouse 26 rat 24 unclassified drug 24 animal tissue 23 protein expression 21 Rats 20 Mice 19 drug effect 19 gene expression 19 Adult 15 chemistry 15 human cell 15 physiology 15