CRTH2 deficiency retarded T‐cell infiltration (CD4+) in peri‐infarct zones (Appendix Fig S5A and B) and reduced the expression of Th2 cytokines (IL‐4, IL‐5, and IL‐13) in the inflamed hearts after MI (Appendix Fig S5C). This evidence concerns the gene IL13 and myocardial infarction.