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Figure 1 Tissue sections from control (A, C, E) and dilated and fibrillating atria (B, D, F). Collagen and elastic fibers were stained with Masson’s trichrome (A, B), orcein (C, D) and glycogen granules with PAS (E, F), respectively (arrow), and nuclei were counterstained with hematoxylin. A to E, bar = 40 µm; E and F, bar = 20 µm.