_:vb50943050 . _:vb50943050 . _:vb50943050 . _:vb50943050 . _:vb50943050 "A retinitis pigmentosa that has_material_basis_in mutation in the RP2 gene on chromosome Xp11.3."^^ . _:vb50943050 . _:vb50943050 "url:https://www.ncbi.nlm.nih.gov/pubmed/9697692"^^ .