RELA and pulmonary arterial hypertension: Further analysis of pulmonary arterial EC showed higher numbers of overall p65+ (23.7±1.6 in PAH versus 8.0±2.2% in controls, p<0.0001) and nuclear p65+ cells (38.5±2.1 in PAH versus 6.4±1.6 in controls, p<0.0001, Figure 6c).