CEACAM1 and systemic lupus erythematosus: miR-31 also inhibits carcinoembryonic antigen related cell adhesion molecule 1 (CEACAM1)-S, which represses Treg development in a model of murine liver autoimmunity but promotes Treg development in peripheral blood mononuclear cells (PBMCs) isolated from systemic lupus erythematosus (SLE) patients (179).