STUDIES OF THE TRIAD : II. Penetration of Tracers into the Junctional Gap |
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Authors: | Clara Franzini-Armstrong |
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Affiliation: | From the Departments of Physiology and Anatomy, Duke University Medical Center, Durham, North Carolina 27706. |
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Abstract: | Ferritin and Imferon molecules were introduced as tracers inside "skinned" muscle fibers to test which part of the triadic junction gap is freely exchangeable with the sarcoplasm. At least 50% of the T-system surface is freely accessible from the sarcoplasm. Of the remainder, 30% of the total T-system surface is covered by the junctional feet, and 20% in the center of the junction may or may not be accessible. The possibility is discussed that the triadic junction may not function as an electrical coupling. |
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