Article Male controlled study 62 male 62 protein expression Animals 54 animal 54 nonhuman 54 metabolism 50 animal experiment 44 priority journal 36 mouse 34 animal cell 32 Mice 30 physiology 30 pathology 28 Humans 26 adult 26 female 26 genetics 26 human 26 unclassified drug 26 Female 22 animal model 20 drug effects 20 animal tissue 18 in vivo study 18 messenger RNA 16 apoptosis 14 human cell 14