Consistently, in situ immunofluorescence staining exhibited that macrophages in AAA lesions from Ninj1ΔMΦ mice showed a reduced expression level of INOS and the enhanced expression level of CD206 (Figure 3C–F), indicating that macrophage NINJ1 deficiency inhibited pro‐inflammatory phenotype of macrophages in AAA. This evidence concerns the gene MRC1 and triple-A syndrome.