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Campomelic dysplasia (CD; MIM 114290), an autosomal dominant skeletal malformation syndrome with XY sex reversal, is caused by heterozygous de novo mutations in and around the SOX9 gene on 17q. We report a patient with typical signs of CD, including sex reversal, who was, surprisingly, homozygous for the nonsense mutation Y440X. Since neither parent carried the Y440X mutation, possible mechanisms...