_:vb50943004 "url:https://www.ncbi.nlm.nih.gov/pubmed/11875050"^^ . _:vb50943004 . _:vb50943004 . _:vb50943004 . _:vb50943004 . _:vb50943004 . _:vb50943004 "A retinitis pigmentosa that has_material_basis_in mutation in the IMPDH1 gene on chromosome 7q32."^^ .