nonhuman article 304 controlled study 200 priority journal 198 Animals 193 animal cell 116 unclassified drug 93 Mice 91 mouse 90 animal experiment 73 male 66 protein expression 63 Humans 58 animal tissue 58 Male 57 female 49 Female 48 Animalia 47 metabolism 45 animal 44 human 39 Rats 37 animal model 37 protein function 36 rat 36 Molecular Sequence Data 35 gene expression 35 signal transduction 35 messenger RNA 32 Mammalia 30