Animals article unclassified drug nonhuman 731 controlled study 569 priority journal 510 animal cell 383 Mice 272 Humans 257 mouse 230 animal experiment 216 human 215 protein expression 190 Rats 180 animal tissue 176 rat 162 animal 160 Male 159 Female 149 human cell 134 metabolism 123 Cercopithecus aethiops 120 male 118 animal model 117 female 117 protein function 113 in vitro study 104 messenger RNA 103 Trypanosoma cruzi 98 Molecular Sequence Data 96