The relationship of skin color to zygosity in twins.
D000293:Adolescent; D000328:Adult; D001789:Blood Group Antigens; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010858:Pigmentation; D011247:Pregnancy; D014427:Twins
D001789:Blood Group Antigens