_:vb50943055 . _:vb50943055 . _:vb50943055 "A retinitis pigmentosa that has_material_basis_in variation on the Y chromosome."^^ . _:vb50943055 . _:vb50943055 . _:vb50943055 . _:vb50943055 "url:https://www.ncbi.nlm.nih.gov/pubmed/7493160"^^ .