Article human 254 human cell controlled study 236 Humans 180 metabolism 148 priority journal 140 nonhuman 116 unclassified drug 108 protein expression 92 in vitro study 78 Animals 76 animal 74 drug effects 72 animal cell 70 mouse 70 female 64 signal transduction 60 animal experiment 56 cell proliferation 56 genetics 56 tumor cell line 54 Cell Line, Tumor 52 male 52 Female 48 apoptosis 48 cell line 48 chemistry 48 pathology 46 Cell Line 44