Humans human 278 human cell metabolism controlled study 250 priority journal 148 Article 142 article 128 Animals 118 animal 118 unclassified drug 110 genetics 102 nonhuman 102 protein expression 102 female 92 signal transduction 90 cell line 82 mouse 78 Cell Line 76 Female 76 animal cell 76 physiology 76 tumor cell line 76 Cell Line, Tumor 74 chemistry 72 drug effects 70 cell proliferation 68 Mice 66 in vitro study 66 apoptosis 62