human human cell nonhuman controlled study 386 Humans 331 article 328 animal cell 313 Animals 312 priority journal 300 mouse 224 unclassified drug 221 Mice 185 protein expression 163 animal experiment 152 animal 118 animal model 118 Article 116 metabolism 107 male 104 female 96 in vitro study 94 Cell Line 93 signal transduction 88 cell proliferation 82 Cell Line, Tumor 81 Female 77 in vivo study 77 animal tissue 72 Male 68 protein function 65