Additionally, it was noted that those patients possessing KCNJ2 mutations appeared to have a distinctive electrocardiographic phenotype, consisting of a prolonged terminal T wave downslope, a widened T-U wave junction, as well as biphasic and enlarged U waves; such findings were not evident in either ATS patients lacking KCNJ2 mutations or in healthy controls. The gene discussed is KCNJ2; the disease is Andersen-Tawil syndrome.