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metachromatic granule
a granular cell inclusion that stains a color different from that of the dye used. In certain bacteria, yeasts, yeastlike
fungi, and protozoa, metachromatic granules appear red when stained with a blue dye. They are composed of complex polyphosphate,
lipid, and nucleoprotein molecules (volutin) and serve as an intracellular phosphate reserve. Called also Babès-Ernst granule.

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