The freeze-fracturing technique was used to characterize the junctional devices involved in the electrical coupling of frog atrial fibres. These fibres are connected by a type of junction which can be interpreted as a morphological variant of the “gap junction” or “nexus”. The most characteristic features are rows of 9-nm junctional particles forming single or anastomosed circular profiles on the inner membrane face, and corresponding pits on the outer membrane face. Very seldom aggregates consisting of few geometrically disposed 9-nm particles are found. The significance of the junctional structures in the atrial fibres is discussed, with respect to present knowledge about junctional features of gap junctions in various tissues, including embryonic ones.
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JOURNAL ARTICLE| 01 November 1976
Freeze-fracture studies of frog atrial fibres
Online Issn: 1477-9137
Print Issn: 0021-9533
© 1976 by Company of Biologists
J Cell Sci (1976) 22 (2): 427–434.
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F. Mazet, J. Cartaud; Freeze-fracture studies of frog atrial fibres. J Cell Sci 1 November 1976; 22 (2): 427–434. doi: https://doi.org/10.1242/jcs.22.2.427
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