As shown by Venkateshaiah et al. (2021) [12] in their first work, blood mRNA levels of receptors of IL-15 responsive T-cell (Vα24, Jα18, γδ T, and αβ T) and IgE (FcεRI) are reduced in EoE compared to GERD and the correlation analysis of FcεRII, Jα18, and δTCR are the positive predictors that discriminate EoE from GERD. The gene discussed is FCER2; the disease is eosinophilic esophagitis.