Animals article priority journal unclassified drug nonhuman 475 controlled study 397 animal cell 279 Mice 202 mouse 170 Humans 159 protein expression 148 animal experiment 147 animal tissue 134 human 126 Rats 120 Female 104 Male 103 rat 102 female 87 protein function 85 male 83 animal model 79 Molecular Sequence Data 78 human cell 75 Amino Acid Sequence 71 animal 70 messenger RNA 68 Cercopithecus aethiops 67 nucleotide sequence 67 Trypanosoma cruzi 65