Notably, flow cytometry studies identified intestinal macrophages as important producer of CCL1 (Figure 2D) compared to ILC2s (20) or regulatory T cells (16) or other important immune cells within LPMC of mice with DSS colitis (Figures 2E, F) confirming previous results that found CCL1 protein in exosomes of gut-derived M2 macrophages (24). The gene discussed is CCL1; the disease is colitis.