FOXM1 and pulmonary arterial hypertension: Genetic disruption of endothelial FoxM1 in Egln1Tie2Cre mice reduced RVSP, and attenuated pulmonary vascular remodeling evident by reduction of PA wall thickness and muscularization of distal PAs, suggesting FoxM1 in ECs contributes to the severity of vascular remodeling and PAH.