South America nonhuman article 93 Animals 87 Argentina 69 controlled study 54 priority journal 35 Female 33 animal experiment 30 Male 29 female 28 Phylogeny 25 male 24 human 23 Article 22 phylogeny 21 Animalia 20 animal 20 genetics 18 animal tissue 17 Humans 15 adult 14 classification 14 morphology 14 nucleotide sequence 14 polymerase chain reaction 14 Buenos Aires [Argentina] 13 Mammalia 13 seasonal variation 13 Chagas disease 12