Article human Humans 241 controlled study 230 priority journal 162 nonhuman 152 metabolism 137 human cell 127 female 122 Animals 107 male 106 animal 105 unclassified drug 97 Female 90 genetics 87 adult 86 Male 76 protein expression 73 drug effects 62 chemistry 59 animal cell 56 in vitro study 56 mouse 56 physiology 54 animal experiment 51 signal transduction 47 pathology 44 Adult 40 Argentina 39 major clinical study 39