IL4 and eosinophilic esophagitis: Th2 cytokines interleukin (IL)‐4, IL‐5 and IL‐13 are expressed at high levels in EoE biopsy tissue, and single‐cell RNA sequencing has demonstrated elevated numbers of CD3+ Th2‐like GATA3+ cells in the oesophageal mucosa.13, 14