To further validate ATF3's involvement in AAD progression, we assessed aortic diameter differences between Atf3 cKO mice and their control littermates using a PPE‐induced abdominal aortic aneurysm (AAA) model, in which PPE degrades elastic fibres, causing aortic damage and aneurysm development. The gene discussed is ATF3; the disease is abdominal aortic aneurysm.