title: Human scalp hair genetics by twin study.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D005823:Genetics; D006197:Hair / Q000033:anatomy & histology* / Q000166:cytology; D006801:Humans; D008297:Male; D009929:Organ Size; D011247:Pregnancy; D012737:Sex Factors; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic