anatomical variation Male 12 male 12 Female 10 controlled study 10 female 10 Animals 8 adult 8 nonhuman 8 physiology 8 priority journal 8 Article 6 Humans 6 anatomy and histology 6 animal 6 article 6 morphometrics 6 Adult 4 Models, Anatomic 4 Triatoma 4 Triatoma infestans 4 growth, development and aging 4 histology 4 human 4 human experiment 4 immunohistochemistry 4 mathematical computing 4 phenotype 4 phonetics 4 speech 4