Elastase‐perfused WT mice receiving γKO macrophages exhibited a partial reduction in AAA (% aortic diameter: WT → WT, 243±11; γKO → WT, 186±7, P = 0.0024) and lesser degrees of medial elastin degradation (34% decrease vs WT → WT). The gene discussed is ELN; the disease is triple-A syndrome.