animal cell nonhuman 206 protein function controlled study 196 Animals 178 article 158 priority journal 158 mouse 138 protein expression 130 Mice 112 animal experiment 92 unclassified drug 86 human 76 animal 70 metabolism 70 animal tissue 68 Humans 66 animal model 66 female 64 male 62 rat 62 Female 60 Rats 56 human cell 54 signal transduction 54 genetics 52 protein analysis 48 Male 46 cell proliferation 46 messenger RNA 44