Animals nonhuman protein function priority journal 224 controlled study 222 article 198 protein expression 181 animal cell 161 Humans 141 unclassified drug 139 human 137 mouse 129 Mice 122 animal 113 metabolism 107 animal experiment 103 signal transduction 85 animal tissue 83 Female 73 Rats 66 animal model 64 female 64 rat 64 male 63 Signal Transduction 59 protein analysis 59 Male 58 protein protein interaction 58 genetics 57 Article 56