In addition, CD4+ T cells from SLE patients and healthy volunteers were transfected with LV‐Bach2 or LV‐NC, and then, the modified CD4+ T cells were incubated with TGF‐β, IL‐4, and IL‐2 to induce Th9 cell differentiation. The gene discussed is BACH2; the disease is systemic lupus erythematosus.