CCL20 and systemic lupus erythematosus: Immune cells, such as T cells, NK cells, Macro/DCs and B cells in the epidermis of DLE and SLE, highly expressed CXCR3 (Fig. 9c), which is a receptor for the chemokine ligand CCL20 with higher expression levels in keratinocytes of DLE and SLE patients than in those of HCs.