_:vb50945481 . _:vb50945481 "url:https://www.ncbi.nlm.nih.gov/pubmed/9806847"^^ . _:vb50945481 . _:vb50945481 . _:vb50945481 . _:vb50945481 . _:vb50945481 "A congenital nystagmus that has_material_basis_in heterozygous mutation in a region of chromosome 7p11.2."^^ .