Developmental and Epileptic Encephalopathy 9, also known as efmr, is related to developmental and epileptic encephalopathy and early infantile epileptic encephalopathy, and has symptoms including convulsive seizures, absence seizures and myoclonic seizures. An important gene associated with Developmental and Epileptic Encephalopathy 9 is PCDH19 (Protocadherin 19), and among its related pathways/superpathways are Neuroscience and Rett syndrome causing genes. Affiliated tissues include brain, and related phenotypes are febrile seizure (within the age range of 3 months to 6 years) and intellectual disability