human nonhuman priority journal Humans 604 Animals 530 article 440 controlled study 428 animal cell 320 human cell 316 unclassified drug 292 mouse 250 protein expression 248 Mice 236 animal 210 metabolism 194 animal experiment 168 signal transduction 160 Article 152 Female 142 protein function 138 female 130 male 128 animal model 124 genetics 108 Male 104 in vitro study 104 animal tissue 100 review 98 gene expression 90 cell proliferation 88