human 414 human cell unclassified drug controlled study 337 Humans 325 article 291 priority journal 222 nonhuman 221 Animals 185 animal cell 141 protein expression 127 metabolism 110 mouse 109 Article 108 Cell Line, Tumor 107 Mice 98 Cell Line 92 in vitro study 89 animal 77 cell proliferation 75 female 69 chemistry 66 animal experiment 65 signal transduction 63 animal model 59 protein function 59 drug structure 56 apoptosis 55 cell line 54 in vivo study 53