IL13 and asthma: The first looked into the epigenetic response of cultured BECs to interleukin 13 (IL‐13), a key cytokine involved in asthma pathogenesis,31 and identified in the IL‐13‐treated cells an epigenetic fingerprint consisting of 6522 differentially methylated CpG sites (44% hypermethylated, 56% hypomethylated) compared to controls, most of which (77%) were near a gene body (41%), or gene transcription start site (36%), totaling 3771 genes.