title: Familial twinning: a case for superfetation in man.
mesh_terms: D010064:Embryo Implantation; D005260:Female; D005799:Genes, Dominant; D005865:Gestational Age; D006801:Humans; D008297:Male; D010060:Ovulation; D010375:Pedigree; D011247:Pregnancy; D011272:Pregnancy, Multiple; D013476:Superfetation; D014427:Twins; D014429:Twins, Dizygotic