Next, pseudo‐time analysis with the Monocle R package revealed distinct trajectories after point 1 for fibroblasts from the normal (Sham 4 weeks and Sham tdT) and AAA groups (Ang II tdT and Ang II 4 weeks), where Cd34high cells initiated the trajectory and transitioned to Cd34low cells (Figure S11E–G, Supporting Information), suggesting potential transdifferentiation from CD34+ cells to myofibroblasts during AAA progression. This evidence concerns the gene CD34 and triple-A syndrome.