FUT4 and bronchopulmonary dysplasia: Compared with non-BPD preterm infants with infection, both the proportion of M-MDSCs and CD15+LOX-1+ cells of BPD infants with infection (8-14d after birth, GA <34w) increased (Figure 1(e)), and the proportion of PMN-MDSCs decreased without statistical significance (P > 0.05).