Humans nonhuman Animals 1,064 human 968 priority journal 813 article 754 controlled study 658 unclassified drug 457 animal cell 422 animal 409 Mice 372 mouse 351 human cell 331 protein expression 320 metabolism 308 animal experiment 270 Female 257 female 231 Article 229 Male 200 signal transduction 196 animal model 180 male 178 genetics 177 protein function 173 physiology 163 review 155 Trypanosoma cruzi 153 animal tissue 153 chemistry 146