_:vb50943021 . _:vb50943021 . _:vb50943021 . _:vb50943021 "url:https://www.ncbi.nlm.nih.gov/pubmed/20451172"^^ . _:vb50943021 . _:vb50943021 "A retinitis pigmentosa that has_material_basis_in mutation in the TTC8 gene on chromosome 14q31."^^ . _:vb50943021 .