KCNK3 and pulmonary arterial hypertension: We analyzed the expression of several genes, which are found to be mutated in some patients with heritable PAH or downregulated in several forms of non-heritable human and experimental PH [2], e.g. Bmpr2, Kcna5 and Knck3, which encode for the BMPR2, KV1.5 and TASK1 proteins, respectively.