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A, Representative photographs of Azan–Mallory staining of heart sections obtained 24 hours after ROSC in the absence (right) or presence (left) of H2 inhalation. B, Fibrotic tissue area stained blue (%) in sham and rats 24 hours after ROSC with or without H2 inhalation. Bars represent the standard error (n=4 to 6); *P<0.05 between groups. ROSC indicates return of spontaneous circulation.
