CD4 and inflammatory bowel disease: The results indicated that the high-immune-infiltration group included not only common immune cell types observed in IBD, such as activated CD4 T cells, central memory CD4 T cells, CD8-positive T cells, plasma cells, and mast cells, but also less common cell types, such as dendritic cells, M1 macrophages, neutrophils, and Tregs, which may be involved in the onset and progression of IBD.