South America article Argentina 152 Animals 124 nonhuman 93 controlled study 56 animal 51 genetics 47 priority journal 44 Phylogeny 42 Female 39 phylogeny 38 classification 37 Male 35 female 34 physiology 33 human 31 male 30 Buenos Aires [Argentina] 26 animal experiment 26 genetic variability 26 Humans 25 Animalia 20 fungus 20 morphology 20 nucleotide sequence 20 water 20 Geography 19 polymerase chain reaction 19 Chagas disease 18