_:vb50940942 . "early infantile epileptic encephalopathy 4"^^ . "disease_ontology"^^ . . "DEE4"^^ . "DOID:0080436"^^ . "A developmental and epileptic encephalopathy characterized by onset of tonic seizures in early infancy and severely impaired psychomotor development that has_material_basis_in heterozygous mutation in the STXBP1 gene on chromosome 9q34.1."^^ . _:vb50940942 . . "OMIM:612164"^^ . _:vb50940942 . _:vb50940942 . . . _:vb50940942 . "developmental and epileptic encephalopathy 4"^^ .