CD4 and bronchopulmonary dysplasia: The proportions of neutrophils, macrophages M0, and monocytes were elevated in the BPD samples compared to the control samples, whereas the proportions of T cells CD4 naive, T cells CD4 memory resting, T cells CD8, B cells naïve, macrophages M2, and dendritic cells activated were elevated in the control samples compared to the BPD samples (Figure 7A).