controlled study human human cell nonhuman Humans 292 Animals 271 article 270 animal cell 262 priority journal 254 mouse 195 unclassified drug 187 Mice 160 protein expression 152 animal experiment 140 animal model 111 Article 108 animal 101 metabolism 95 female 91 male 89 in vitro study 83 Cell Line 79 cell proliferation 75 in vivo study 75 animal tissue 72 signal transduction 71 Cell Line, Tumor 70 Female 67 Male 59 protein function 59