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Concentration-dependent in vitro smooth muscle responses to acetylcholine (A and C) and frequency-dependent responses (EFS) to nerve stimulation (B and D) in both WT mice (A and B) and IL-13Rα2−/− mice (C and D). *, p < 0.05 vs WT vehicle and ϕ, p < 0.05 vs IL-13Rα2−/− vehicle. Nb, N. brasiliensis.
