Summary
Intranuclear filamentous inclusions were found in the normal endocrine cells of the avian stomach and pancreas. These inclusions were composed of a bundle of closely packed filaments (6–8 nm in diameter), being ultrastructurally similar to those found in the nucleus of various neurons. Most of them appeared as single rod- or spindle-shaped bodies; aggregations of two or more inclusions were rarely seen within a single nucleus. Cells with an intranuclear inclusion often contained a cytoplasmic fibrillar bundle similar to the intranuclear inclusion.
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Iwanaga, T., Yamada, J., Yamashita, T. et al. Intranuclear filamentous inclusions in the gastro-entero-pancreatic (GEP) endocrine cells of birds. Cell Tissue Res. 217, 283–288 (1981). https://doi.org/10.1007/BF00233581
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DOI: https://doi.org/10.1007/BF00233581