_:vb50940927 . _:vb50940927 . _:vb50940927 . _:vb50940927 . _:vb50940927 "A developmental and epileptic encephalopathy characterized by onset in the first year of life of seizures, global developmental delay, severely impaired intellectual development, hypotonia, and other persistent neurologic deficits that has_material_basis_in heterozygous mutation in the GABRB1 gene on chromosome 4p13."^^ . _:vb50940927 . _:vb50940927 "url:https://www.ncbi.nlm.nih.gov/pubmed/23934111"^^ . _:vb50940927 "url:https://pubmed.ncbi.nlm.nih.gov/31618474/"^^ .