_:vb50942963 . _:vb50942963 . _:vb50942963 . _:vb50942963 . _:vb50942963 "url:https://www.ncbi.nlm.nih.gov/pubmed/19878916"^^ . _:vb50942963 . _:vb50942963 "A retinitis pigmentosa that has_material_basis_in mutation in the SNRNP200 gene on chromosome 2q11."^^ .