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Effects of exogenous hydrogen sulfide on histological and ultrastructural alterations in myocardial tissues. (A) Representative H&E staining of myocardial tissues. (B) Representative transmission electron micrographs of myocardial tissues. Arrows indicate the swollen mitochondria. H&E, hematoxylin and eosin; NC, normal control; DM, diabetes mellitus; NaHS, sodium hydrosulfide; TEM, transmission electron microscope.
