_:vb50943738 . _:vb50943738 "An Usher syndrome characterized by mild to severe congenital hearing impairment, normal vestibular function and later development of retinitis pigmentosa."^^ . _:vb50943738 . _:vb50943738 "url:https://www.ncbi.nlm.nih.gov/pubmed/2909824"^^ . _:vb50943738 . _:vb50943738 . _:vb50943738 . _:vb50943738 . _:vb50943738 "url:https://ghr.nlm.nih.gov/condition/usher-syndrome"^^ . _:vb50943738 . _:vb50943738 "url:https://www.ncbi.nlm.nih.gov/books/NBK1341/"^^ . _:vb50943738 "url:https://www.ncbi.nlm.nih.gov/pubmed/9624053"^^ .