The results of ELISA indicated a higher serum NINJ1 concentration in the AAA group compared with that in the non‐AAA group in clinical samples (Figure 1B), but no significant difference in serum NINJ1 concentration was found between control and angiotensin II (Ang II)‐induced AAA mice (Figure S1D, Supporting Information). This evidence concerns the gene NINJ1 and triple-A syndrome.