metabolism nonhuman protein function Animals 107 animal 105 controlled study 104 priority journal 81 unclassified drug 78 genetics 75 protein expression 71 human 68 animal cell 65 Article 64 Humans 63 mouse 60 article 53 Mice 52 animal experiment 42 physiology 38 signal transduction 38 protein analysis 37 chemistry 31 animal tissue 28 in vitro study 28 cytology 27 gene expression regulation 27 animal model 26 Signal Transduction 24 protein protein interaction 24 drug effects 23