Figures 193 (upper) and 194 (lower) from Chapter 5 (Endoplasmic Reticulum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. In this fast acting muscle of the toadfish swim bladder, multiple layers of sarcotubules converge onto the terminal cisternae. From Fawcett and Revel (1961) J. Biophys. Biochem. Cytol. 10(suppl):89-109, republished with permission. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.
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