In the second in vivo experiment, to explore the effect of formoterol treatment alone on the formation of AAA without EPO pretreatment, we performed intraperitoneal injections of saline, low‐dose of formoterol, medium‐dose of formoterol, and high‐dose formoterol into 4 groups of ApoE−/− mice, respectively. The gene discussed is EPO; the disease is triple-A syndrome.