title: An enquiry into the genetic basis of human scalp hair cross section (area) by twin study.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D005826:Genetics, Medical; D006197:Hair / Q000033:anatomy & histology*; D006801:Humans; D008297:Male; D011247:Pregnancy; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic