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Representative immunohistochemistry (x20) for CD31 of the ascending aorta. Note the CD31 positivity (white arrow) in the outer third medial layer of the ascending aorta suggesting susceptibility for aortic dissection in (a) The onset of dissection (white brackets) in b at the site of CD31 positivity (white arrow). Inlets (x40) at the bottom left corner show the site of interests in detail.
