STXBP1 and juvenile absence epilepsy: ‘Simple febrile seizures’ (HP:0011171; f = 0.002), ‘Myoclonic atonic seizures’ (HP:0011170; f = 0.002), ‘Typical absence seizures’ (HP:0011147; f = 0.004) and ‘Hemiclonic seizures’ (HP:0006813; f = 0.01) were reported in fewer than 10 individuals with STXBP1-related disorders.