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. 2011 Feb 22;6(2):e16734. doi: 10.1371/journal.pone.0016734

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Fujiwara et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Transmission electron microscopic images of beating colonies. Myofibrils with Z-bands (white closed arrowheads in A–D.), mitochondria (black closed arrowheads in B–D.), intercalated disk-like structure with desmosome (white open arrow in D.), atrial sercetory granules (electron-dense granules surrounded by double membranes. White open arrowheads in A. and E. (magnified image of A.)), glycogen granules (electron-dense small granules. Black open arrowheads in D. and F. (magnified image of D.)), ribosomal granules (electron-lucent small granules. White arrows in B–D. and G. (magnified image of B.)). N: nucleus. Scale bar = 2 µm, direct magnify, ×3000 (A), ×7000 (B), ×4000 (C), ×5000 (D).