FUT4 and infection: The results showed that there was no difference in the proportion of M-MDSCs (CD11b+HLA−DR−CD14+CD15−), CD15+LOX1+, and PMN-MDSCs (CD11b+HLA−DR−CD14−CD15+) between premature infants with infection (3-7d after birth, GA <34w) and preterm infants with BPD (3-7d after birth, GA <34w) at the same period (P > 0.05) (Figure 1(b)).