TSLP and allergic disease: Therefore, we inferred that the exposure of MEP could not induce allergic symptoms through the changes in the methylation levels of TSLP. The positive correlation between MEP and TSLP methylation levels might be because another factors that associated with both of MEP and TSLP rather than the direct effect of MEP on TSLP. Further researches are needed to address the correlation between MEP and allergic disease and the potential mechanism between MEP and TSLP methylation.