As shown in Figure 1(a), in the absence of infection, BPD premature infants with gestational ages (GA) <28 weeks had lower M-MDSCs (CD11b+HLA−DR−CD14+CD15−) and PMN-MDSCs (CD11b+HLA−DR−CD14−CD15+) levels than that in premature infants with GA >28 weeks. Here, FUT4 is linked to infection.