title: New type of twin spot.
authors.forename: M A M
authors.initials: MA
authors.lastname: van Steensel
authors.forename: P M
authors.initials: PM
authors.lastname: Steijlen
authors.forename: M B
authors.initials: MB
authors.lastname: Maessen-Visch
mesh_terms: D000328:Adult; D001415:Back; D003434:Crossing Over, Genetic; D006801:Humans; D007911:Lentigo / Q000235:genetics* / Q000473:pathology; D008297:Male; D008938:Mitosis / Q000235:genetics; D008957:Models, Genetic; D009154:Mutation; D009508:Nevus, Pigmented / Q000235:genetics* / Q000473:pathology; D012867:Skin / Q000473:pathology