title: Penetrance of gene for absent c-triradius from 567 sets of monozygotic twins.
mesh_terms: D003878:Dermatoglyphics; D005260:Female; D005787:Gene Frequency; D005799:Genes, Dominant; D005838:Genotype; D006801:Humans; D007558:Italy; D008297:Male; D011247:Pregnancy; D012737:Sex Factors; D014427:Twins; D014430:Twins, Monozygotic; D014481:United States