RT-qPCR results also demonstrated that for both normal and PAH rats, the gene expression of CXCR4 and SDF-1 (Figure 4A,B) in cultured BMCs showed similar trends to that of CD14 (Figure 4C), rather than that of CD10 and ADGRE1 (Figure 4D,E). Here, MME is linked to pulmonary arterial hypertension.