TSLP is detectable in the serum of IL-7^−/− K14-TSLP Tg mice. (A) TSLP expression in skin, thymus, BM, et al. Each bar displays the mean of values obtained from cDNA from 2 mice. Results are representative of 3 independent experiments. (B) TSLP concentration in sera from IL-7^−/−, IL-7^−/− K14-TSLP Tg, and WT mice was quantified by ELISA. Each symbol represents the result from an individual mouse. The mean of TSLP concentration is indicated.