Animals controlled study protein expression protein function nonhuman 130 article 112 priority journal 93 animal cell 92 Mice 74 mouse 74 unclassified drug 70 animal experiment 56 Humans 53 animal tissue 52 animal 50 human 50 metabolism 48 Female 45 protein localization 44 animal model 42 female 39 protein analysis 39 Rats 38 rat 38 male 37 protein protein interaction 36 genetics 35 messenger RNA 32 Male 30 enzyme activity 29