MBP and eosinophilic esophagitis: We examined CRTH2 and VAPC2 receptor expression on tissue-accumulated human eosinophils and mast cells by performing anti-MBP and anti-CRTH2 for eosinophils and anti-tryptase and anti-VAPC2 for mast cells on the biopsy sections of human EoE patients (n = 7–8; Figure 3a–f).