_:vb50942959 . _:vb50942959 . _:vb50942959 . _:vb50942959 "url:https://www.ncbi.nlm.nih.gov/pubmed/20398886"^^ . _:vb50942959 . _:vb50942959 . _:vb50942959 "A retinitis pigmentosa that has_material_basis_in mutation in the C2ORF71 gene on chromosome 2p23."^^ .