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Polysyndactyly of the feet (preaxial polydactyly type IV, PPD-IV) in patients carrying a GLI3 causative mutation (a patient A-2; b patient D-1). Facial appearance of the presented GLI3 mutation carriers; c–d show craniofacial dysmorphism typical of Greig cephalopolysyndactyly syndrome (GCPS) (c patient F-1; d patient D-1)
