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A form of polydactyly, a condition defined by the occurrence of supernumerary digits in the upper and/or lower extremities. Preaxial or radial polydactyly refers to the presence of extra digits on the radial side of the hand. PPD1 is an autosomal recessive form characterized by duplication of the distal phalanx of the thumb.




Polydactyly, preaxial I


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