_:vb50943759 . _:vb50943759 "url:https://www.ncbi.nlm.nih.gov/pubmed/9624053"^^ . _:vb50943759 . _:vb50943759 "An Usher syndrome type 2 characterized by moderate to severe sensorineural hearing loss, mainly affecting perception of high frequency sounds and progressive retinitis pigmentosa that has_material_basis_in homozygous or compound heterozygous mutation in the USH2A gene on chromosome 1q41."^^ . _:vb50943759 . _:vb50943759 . _:vb50943759 .