_:vb50944006 "A brachydactyly characterized by rachymesophalangy of the index, middle and little fingers, hyperphalangy of the index and middle finger, and shortening of the 1st metacarpal that has_material_basis_in heterozygous mutation in the GDF5 gene on chromosome 20q11."^^ . _:vb50944006 . _:vb50944006 . _:vb50944006 . _:vb50944006 "url:https://www.ncbi.nlm.nih.gov/pubmed/9288091"^^ . _:vb50944006 . _:vb50944006 .