Another study focused on the deposition of IgG4 and food proteins in the esophageal mucosa of patients with EoE, identifying specific eosinophil-derived proteins (e.g., PRG2, PRG3, EPX, and RNASE3) and calpain-14 in IgG4-enriched regions using the AutoSTOMP technique [102]. Here, PRG3 is linked to eosinophilic esophagitis.