_:vb50943763 . _:vb50943763 "An Usher syndrome type 2 that has_material_basis_in by homozygous or compound heterozygous mutation in the WHRN gene on chromosome 9q32."^^ . _:vb50943763 . _:vb50943763 . _:vb50943763 . _:vb50943763 "url:https://www.ncbi.nlm.nih.gov/pubmed/17171570"^^ . _:vb50943763 .