We identified 38 patients with DS, all of whom had a confirmed mutation in SCN1A. In total, 32 patients were aware of the correct mutation data: 19 missense mutations in 21 patients, 2 nonsense mutations in 2 patients, 1 splice-site mutation in 1 patient, 5 frameshift mutations in 6 patients, and 2 chromosome deletions in 2 patients (Fig. 1). The gene discussed is SCN1A; the disease is Dravet syndrome.