As shown in Figure 5(a), CX3CR1 showed promising discriminatory ability of PAH in GSE15197 (AUC = 0.827), with a slight but acceptable decrease in GSE113439 (Figure 5(b), AUC = 0.737), GSE48149 (Figure 5(c), AUC = 0.773) and GSE33463 (Figure 5(d), AUC = 0.751). Here, CX3CR1 is linked to pulmonary arterial hypertension.