Fig. 5. Expressions of MHC-II, CD80, CD86 and IL-12 in lung tissue of rats with or without dust exposure over 84 days. Changes in expression of CD80 (A). Changes in expression of CD86 (B). Changes in expression of MHC-II (C). Changes in expression of IL-12 (D). n = 6. Error bars indicate the SEM. *P < 0.05 compared with the saline group. All values represent the mean ± SEM.