Humans controlled study human human cell nonhuman Animals 249 article 214 animal cell 202 priority journal 188 unclassified drug 153 mouse 147 Mice 146 protein expression 114 animal experiment 108 animal 99 metabolism 91 animal model 85 Cell Line 75 female 73 Article 70 Cell Line, Tumor 68 in vivo study 63 male 63 Female 61 cell proliferation 61 in vitro study 61 Male 59 signal transduction 53 animal tissue 50 protein function 49