Conversely, WT macrophage transfer into γKO recipient mice exacerbated AAA, as evidenced by increased aortic dilation (% aortic diameter: γKO → γKO, 112±7; WT → γKO, 149±5; P = 0.0034) and a 26% higher degree of elastin degradation (Supplementary Figure S2E‐I). The gene discussed is ELN; the disease is triple-A syndrome.