We recently showed that TSLP protein is overexpressed in the esophageal epithelium in actively inflamed human EoE.[11] We used IHC to compare the immunolocalization of TSLP between three groups of pediatric subjects: non-EoE controls, inactive EoE subjects (<15 eos/hpf), and active EoE subjects (≥ 15 eos/hpf). The gene discussed is TSLP; the disease is eosinophilic esophagitis.