_:vb50942990 . _:vb50942990 "A retinitis pigmentosa that has_material_basis_in mutation in the GUCA1B gene on chromosome 6p21.1."^^ . _:vb50942990 . _:vb50942990 . _:vb50942990 "url:https://www.ncbi.nlm.nih.gov/pubmed/15452722"^^ . _:vb50942990 . _:vb50942990 .