DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Color enhanced transmission electron micrograph of intrinsic muscle from the swim bladder of the toadfish. In contrast to the single layer of sarcotubules between myofibrils in most striated muscle, this sample shows multiple layers of sarcotubules converging on the terminal cisternae.
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