FOXP3 and myeloid sarcoma: Starting from the observation that CD103+ gut-associated dendritic cells (DCs) are capable of synthesizing RA, it is known that RA promotes the differentiation of forkhead box P3 (Foxp3+) regulatory T cells and Th2 cells, as well as the induction of IgA-secreting antibody-secreting cells and the inhibition of intestinal Th17 cells [77,78,79], mechanisms involved in MS pathogenesis.