ATP1A3 and alternating hemiplegia of childhood: Both mutations are recurrent—in a survey of 155 unrelated AHC patients 43% had the ATP1A3 c.2401G>A (p.Asp801Asn) mutation and 16% had a c.2443G>A (p.Glu815Lys) mutation, which was associated with a more severe phenotype that included intellectual and motor disability [46].