_:vb50943033 . _:vb50943033 . _:vb50943033 . _:vb50943033 "url:https://www.ncbi.nlm.nih.gov/pubmed/15090652"^^ . _:vb50943033 . _:vb50943033 . _:vb50943033 "A retinitis pigmentosa that has_material_basis_in mutation in the CA4 gene on chromosome 17q23.1."^^ .