_:vb50943737 . _:vb50943737 . _:vb50943737 . _:vb50943737 . _:vb50943737 "url:https://www.ncbi.nlm.nih.gov/books/NBK1265/"^^ . _:vb50943737 . _:vb50943737 . _:vb50943737 "url:https://www.ncbi.nlm.nih.gov/pubmed/2909824"^^ . _:vb50943737 . _:vb50943737 "url:https://ghr.nlm.nih.gov/condition/usher-syndrome"^^ . _:vb50943737 "An Usher syndrome characterized by profound congenital deafness, vestibular dysfunction and early development of retinitis pigmentosa."^^ .