_:vb50939095 . _:vb50939095 "url:https://www.ncbi.nlm.nih.gov/pubmed/19966803"^^ . _:vb50939095 . _:vb50939095 "A Noonan syndrome that has_material_basis in heterozygous mutation in the NRAS gene on chromosome 1p13."^^ . _:vb50939095 . _:vb50939095 . _:vb50939095 .