Developmental and Epileptic Encephalopathy 65, also known as dee65, is related to west syndrome and early infantile epileptic encephalopathy. An important gene associated with Developmental and Epileptic Encephalopathy 65 is CYFIP2 (Cytoplasmic FMR1 Interacting Protein 2). Affiliated tissues include brain, and related phenotypes are seizure and absent speech