Paraffin blocks of heart slices were cut in 6 μm-thick slices and stained with Masson’s trichrome for the evaluation of cardiomyocyte area. Digital images of transversally cut cardiomyocytes were captured using a light microscope (Olympus, Germany) at 20× magnification. Four mice were employed for each condition (three fields per heart), and cardiomyocyte size was calculated by quantitation of 150–200 cells per field using image analysis software (ImageJ).
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