_:vb50943741 "An Usher syndrome characterized by retinitis pigmentosa and onset of sensorineural hearing impairment in the teens that has_material_basis_in mutation in the MTTS2 gene in the mitochondrial genome."^^ . _:vb50943741 . _:vb50943741 "url:https://www.ncbi.nlm.nih.gov/pubmed/10090882"^^ . _:vb50943741 . _:vb50943741 . _:vb50943741 . _:vb50943741 .