CBLN2 and pulmonary arterial hypertension: Recently, new genes related to PAH have been described as Potassium Channel Subfamily K, Member 3 (KCNK3; MIM #603220)21, Caveolin-1 (CAV1; MIM #601047)22, Cerebellin 2 Precursor (CBLN2; MIM #600433)23 or T-box 4 (TBX4; MIM #601719)24.