MKI67 and triple-A syndrome: Importantly, the percentages of TUNEL‐positive and adjacent Ki‐67‐positive VSMCs were significantly increased in two diseased arteries of mice (Figure 1i) and humans (Figure 1h) than in the normal aortas (AD, TUNEL‐positive: 59.1% ± 6.7% vs 2.4% ± 0.89%, Ki‐67‐positive: 36.6% ± 1.9% vs 2.9% ± 0.72%; AAA, TUNEL‐positive: 66.7% ± 5.4% vs 2.4% ± 0.89%, Ki67‐positive: 15.1% ± 1.6% vs 2.9% ± 0.72%).