CCL22 and Parkinson disease: Both colonocytes positive for FTH1 in those living with IBD in remission or those living with PD displayed a significant enrichment of CEACAM6 (carcinoembryonic antigen–related cell adhesion molecule 6) which acts as a primary receptor for invasive Escherichia coli (E. Coli) colonization27 and CCL22 (C-C motif ligand 22), a common chemotactic indicator of intestinal inflammation also known as MDC (macrophage-derived chemokine)28.