CD4 and necrotizing enterocolitis: By analyzing the differences in the distribution of immune cells between the NEC group and the control group through immune infiltration analysis of this dataset, we found that the numbers of activated dendritic cells, effector memory CD4+ T cells, immature dendritic cells, macrophages, mast cells, MDSCs, natural killer T cells, neutrophils, plasmacytoid dendritic cells, regulatory T cells, T follicular helper cells, Th1 cells and Th17 cells in the NEC group were different from those in the control group (Fig. 2g).