The Fine Structure of Auer Bodies*

Abstract
Auer bodies are enveloped with the limiting membrane and they show various internal structures. The body reveals (I) regularly arranged tubules (100 Å in diameter; 20Å in thickness of the wall) or (II) a bundle of tubules and dense material or (III) less dense homogeneous material. Auer bodies having regularly arranged tubules of a crystal-like appearance in cross section are rod-shaped while others are irregularly shaped. Auer bodies and azurophil granules in promyelocytes resemble to each other in tubular internal structure and in the mode of per oxidase reaction. A tubular structure is confirmed in some specific granules of mye-locytes and in a few specific granules of mature neutrophils. It evidences a transformation of azurophil granules into specific granules.

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