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An immunocytochemical study of the sinuatrial node and atrioventricular conducting system of the rat for atrial natriuretic peptide distribution

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Summary

Immunocytochemical studies of the adult rat heart show that specific heart granules and atrial natriuretic peptide immunoreactivity are absent from the majority of the myocytes of the specialized nodes, atrioventricular bundle and bundle branches. Immunoreactive granules are present in a small proportion of the transitional sinuatrial and atrioventricular nodal myocytes but, in these regions, they are smaller than their counterparts in the general atrial myocytes. A rarer type of cell profile, identical to general atrial myocytes but lacking immunoreactive granules, is also present at the periphery of the sinuatrial node. A very small proportion of myocytes in the ventricular myocardium, generally in the subendocardial layers subjacent to the terminal ramifications of the bundle branches, contain a few immunoreactive granules.

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  1. Department of Anatomy, University of Cambridge, Downing Street, CB2 3DY, Cambridge, UK

    J. N. Skepper

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  1. J. N. Skepper
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Skepper, J.N. An immunocytochemical study of the sinuatrial node and atrioventricular conducting system of the rat for atrial natriuretic peptide distribution. Histochem J 21, 72–78 (1989). https://doi.org/10.1007/BF01005982

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  • DOI: https://doi.org/10.1007/BF01005982

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