Humans article human nonhuman priority journal Animals 237 controlled study 223 human cell 171 animal cell 165 Mice 138 mouse 118 unclassified drug 115 protein expression 106 animal experiment 83 Female 74 metabolism 71 female 64 animal model 63 Cell Line 60 Male 58 animal 56 male 55 Rats 52 signal transduction 50 animal tissue 47 protein function 47 rat 46 Protein Binding 43 in vitro study 41 physiology 41