Heritable PAH causes familial mutations in the genes encoding activin A receptor-like type 1, bone morphogenetic protein receptor type 2, caveolin 1, endoglin, mothers against decapentaplegic homolog 9, and two-pore domain potassium channel subfamily K member 3 (KCNK3/TASK1) (3). Here, KCNK3 is linked to pulmonary arterial hypertension.