Digital flexion creases in twins.
D003878:Dermatoglyphics; D005260:Female; D005823:Genetics; D006801:Humans; D007558:Italy; D008297:Male; D008662:Metacarpophalangeal Joint / Q000033:anatomy & histology; D011247:Pregnancy; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic