The effect of exogenous melatonin or luzindole on OVA-induced inflammatory cells infiltration, IgE and Th2 cytokines production. (A–E) Analysis of total and differential cells found in BALF of OVA-challenged WT or TLR2−/− mice after melatonin or luzindole treatment, respectively. (F) The level of OVA-specific IgE in serum. (G,H) The levels of IL-4 and IL-13 in BALF. **p < 0.01, ***p < 0.001.