Animals 138 animal controlled study priority journal protein expression nonhuman 136 metabolism 124 animal cell 112 mouse 90 animal experiment 84 Mice 82 Article 74 article 64 genetics 62 animal tissue 59 female 58 Female 52 animal model 51 Humans 50 human 50 physiology 50 male 48 Male 44 unclassified drug 44 signal transduction 43 drug effects 41 drug effect 40 cytology 35 pathology 33 in vivo study 32