_:vb50942998 . _:vb50942998 . _:vb50942998 "url:https://www.ncbi.nlm.nih.gov/pubmed/22083234"^^ . _:vb50942998 . _:vb50942998 . _:vb50942998 . _:vb50942998 "A retinitis pigmentosa that has_material_basis_in variation in the chromosome region 6q23."^^ .