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. 1999 Nov 29;147(5):995–1008. doi: 10.1083/jcb.147.5.995

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© 1999 The Rockefeller University Press

This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).

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T-tubule and SR compartments and junctions between them are present in ankyrin-B (−/−) skeletal muscle. Electron micrographs (see Materials and Methods) of quadriceps muscle comparing the organization of the T-tubules and sarcoplasmic reticulum in littermates of normal (A) and ankyrin (−/−) (B) skeletal muscle. The T-tubule lumen is marked by t and the SR membranes by arrows. Note equivalent density between the SR and T-tubule membranes of the triads (arrows) in normal and ankyrin-B fibers.