_:vb50940993 . _:vb50940993 "A developmental and epileptic encephalopathy characterized by onset in the first years of life of seizures, developmental delay, intellectual disability, poor speech, and behavioral abnormalities that has_material_basis_in heterozygous mutation in the KCNB1 gene on chromosome 20q13."^^ . _:vb50940993 . _:vb50940993 . _:vb50940993 . _:vb50940993 "url:https://www.ncbi.nlm.nih.gov/pubmed/25164438"^^ . _:vb50940993 .