human nonhuman protein expression Humans 270 Animals 258 priority journal 248 controlled study 230 article 188 animal cell 178 human cell 174 mouse 162 unclassified drug 158 Mice 148 animal experiment 120 protein function 120 metabolism 108 animal 106 animal model 100 Female 92 signal transduction 92 Article 88 female 88 male 78 animal tissue 74 cell proliferation 72 genetics 66 in vitro study 64 in vivo study 62 Cell Line, Tumor 58 Male 56