IL17A and systemic lupus erythematosus: The results showed that NKT cells were deficient in patients with SLE compared with healthy controls, and regulated the balance between Th1 and Th2 cells in SLE [27]. γδ T cells, accounting for 5–10% of total T cells, can secrete various types of cytokines (e.g., IFN-γ, IL-10 and IL-17) and can help B cells to produce antibodies [28].