article human physiology Humans 248 controlled study 124 animal 120 metabolism 118 Animals 112 female 108 male 96 Female 94 Male 90 priority journal 90 nonhuman 84 adult 82 Adult 66 human cell 64 drug effect 54 mouse 44 Mice 42 chemistry 40 cell culture 38 genetics 38 unclassified drug 38 Cell Line 36 biological model 36 cell line 36 human experiment 36 animal cell 34 signal transduction 34