Immunofluorescent co-staining of AAA lesions from Apoe−/−Fcer1a−/− recipient mice receiving donor CD4+ T cells from Apoe−/− mice for FcεR1a and Ki67 demonstrated that donor CD4+ T cells not only targeted to the AAA lesions, but also underwent clonal expansion (Fig 3B). This evidence concerns the gene MKI67 and triple-A syndrome.