CD34 and triple-A syndrome: Following quality control, UMAP clustering, and preliminary cell‐type identification of tdT+ cells (Figure S9B,C, Supporting Information), they were integrated with whole‐cell datasets (GSE221789) of normal (Sham 4 weeks) and aneurysmal (Ang II 4 weeks) abdominal aortas to understand the cellular landscapes and communication between CD34 lineage cells and other aortic cells in AAA.