Cryopreserved heart slices were fixed in 4% formaldehyde for 30 min at room temperature (RT), followed by three PBS washes and a 15-min HBSS priming period. Afterward, the cardiac slices were stained with WGA (Thermo Fisher Scientific; W11261) and left in the dark for 10 min at room temperature, followed by PBS washes and DAPI counterstaining. The cardiomyocyte surface area was measured using a fluorescence microscope at X60 magnification and computed using ImageJ (1.52a version; National Institute of Health USA).
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