Consistent with unchanged aortic diameters, AAA lesion macrophage content did not differ between Apoe−/−Fcer1a−/− mice and those receiving CD8+ T-cell adoptive transfer (Supplementary Fig S9D, left panel), although lesion T-cell content and MHC class-II-positive areas increased in AAA lesions from recipient mice receiving donor cells from Apoe−/− mice, but did not reach statistical significance from those receiving donor cells from Apoe−/−Fcer1a−/− mice (Supplementary Fig S9D, right two panels). Here, APOE is linked to triple-A syndrome.