_:vb50945478 . _:vb50945478 . _:vb50945478 . _:vb50945478 "A congenital nystagmus that has_material_basis_in heterozygous mutation in a region of chromosome 6p12."^^ . _:vb50945478 "url:https://www.ncbi.nlm.nih.gov/pubmed/8661013"^^ . _:vb50945478 . _:vb50945478 .