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Growthdifferentiationfactor5(GDF5),also knownascartilage derivedmorphogeneticprotein1(CDMP1),isamemberofthebonemorphogenet icprotein(BMP)familywhichbelongstothe transforminggrowthfactorβ(TGFβ)superfami ly[1].GDF5isarelativelynewmemberofthe BMPfamily.Likeo