POSTN and eosinophilic esophagitis: In addition, POSTN, SOX2, KRT5, and CLDN1 have also previously been reported in EoE through alternative detection methods such as IHC, immunofluorescence, or immunoblotting (Clevenger et al, 2023; Politi et al, 2017; Rochman et al, 2017; Wu et al, 2018).