ACTA1 and triple-A syndrome: A small number of tdT+ cells were αSMA+ (Figure 3B), and very few CD45+ immune cells co‐expressed tdT (Figure 3D–G), suggesting that non‐BM CD34+ cells primarily contributed to myofibroblasts in Ang II‐ or CaCl2‐induced AAA, with no or limited contribution to CD45+ inflammatory cells.