Cytokine levels. IL-4 (A, G), IL-5 (B, H), IL-13 (C, I) IL-10 (D, J), IFN-γ (E, K), and IL-12 (F, L) in BALF were determined in long-term–challenged mice by ELISA as described in Materials and Methods. (A–F) Groups of mice treated with anti-RANTES antibody or control rat IgG. (G–L) Groups of mice treated with RANTES or PBS. Results of each group are expressed as mean ± SEM. *P < 0.05 between groups indicated. N.D., not detectable.