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Aerobic exercise improves prediabetes mellitus-induced aortic damage. The histological morphology of thoracic aorta was examined by hematoxylin and eosin staining in each group of rats. AL, adventitia layer; ML, medial layer; IL, intimal layer. The black and blue arrows indicate the elastic membranes and the smooth muscle nuclei, respectively. Original magnification, ×100 (upper row) or ×400 (lower row).
