Yes‐associated protein (YAP) promotes latent transforming growth factor‐β binding protein 4 (LTBP4)‐mediated elastic fibril assembly in VSMCs, which mitigates the formation of AAA.[35] It was found that the levels of YAP and p‐YAP were decreased in putrescine‐treated HASMCs (Figure S5F,G, Supporting Information). The gene discussed is LTBP4; the disease is triple-A syndrome.