article controlled study human 691 human cell Humans 525 priority journal 472 nonhuman 270 Animals 249 unclassified drug 233 protein expression 226 animal cell 186 female 166 Female 162 Mice 142 cell proliferation 141 mouse 133 signal transduction 133 Cell Line, Tumor 132 male 130 Cell Line 117 apoptosis 115 Male 112 enzyme activity 101 metabolism 101 in vitro study 98 protein function 97 Apoptosis 86 animal experiment 84 Cells, Cultured 81 adult 80