human human cell controlled study 943 article 884 Humans 837 priority journal 798 nonhuman 465 unclassified drug 414 Animals 388 protein expression 348 animal cell 321 metabolism 281 Female 255 female 255 Article 254 mouse 241 signal transduction 226 cell proliferation 223 Mice 220 male 218 in vitro study 211 Cell Line, Tumor 207 Cell Line 202 Male 193 apoptosis 185 animal 155 animal experiment 154 enzyme activity 147 protein function 139 cell culture 138