_:vb50942941 . _:vb50942941 . _:vb50942941 "url:https://www.ncbi.nlm.nih.gov/pubmed/9326941"^^ . _:vb50942941 . _:vb50942941 . _:vb50942941 "A retinitis pigmentosa that has_material_basis_in mutation in the RPE65 gene on chromosome 1p31."^^ . _:vb50942941 .