_:vb50944794 . _:vb50944794 "url:https://www.ncbi.nlm.nih.gov/pubmed/9399207"^^ . _:vb50944794 . _:vb50944794 . _:vb50944794 "An essential tremor that has_material_basis_in heterozygous mutation in a region on chromosome 2p25-p22."^^ . _:vb50944794 . _:vb50944794 .