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Wikipedia definition
1. T-tubuleA T-tubule (or transverse tubule) is a deep invagination of the sarcolemma, which is the plasma membrane, only found in skeletal and cardiac muscle cells. These invaginations allow depolarization of the membrane to quickly penetrate to the interior of the cell.
Read “T-tubule” on English Wikipedia
Read “横行小管” on Japanese Wikipedia
Read “T-tubule” on DBpedia

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