_:vb50942974 . _:vb50942974 . _:vb50942974 . _:vb50942974 . _:vb50942974 "A retinitis pigmentosa that has_material_basis_in mutation in the RHO gene on chromosome 3q22."^^ . _:vb50942974 . _:vb50942974 "url:https://www.ncbi.nlm.nih.gov/pubmed/2137202"^^ .