nonhuman protein expression protein function Animals 181 priority journal 172 controlled study 168 article 164 unclassified drug 119 animal cell 115 human 112 Humans 98 mouse 91 Mice 76 metabolism 71 animal experiment 68 animal 64 protein analysis 56 Female 55 signal transduction 55 animal tissue 54 protein localization 53 animal model 50 protein protein interaction 47 female 46 male 46 protein binding 46 genetics 44 Rats 42 rat 42 Article 40