Male animal female male 283 Female 274 Animals 267 article 129 physiology 119 Argentina 96 nonhuman 91 genetics 81 growth, development and aging 77 controlled study 70 metabolism 69 Article 63 classification 55 adult 53 animal experiment 50 priority journal 47 anatomy and histology 44 human 43 histology 39 parasitology 39 Humans 33 body size 30 animal tissue 28 Body Size 26 Chagas disease 26 Ecosystem 26 Triatoma 26