Peculiar inclusions occur within cisternae of the granular endoplasmic reticulum of some perikarya of the ventromedial hypothalamic nucleus in cats. These inclusions appear as rods or bullet-shaped structures and their interiors are generally less dense. The inclusions may represent virus particles or proteinaceous products of the granular endoplasmic reticulum in which protein-synthetizing activities are probably increased to enormous extents.
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