Summary
The cytoplasm of megakaryocytes frequently exhibits bullate processes which protrude into the lumen of the sinusoids through small apertures in the reticular cells. These bullae differ morphologically from the platelet demarcation zones and are held to have a different function. It is concluded that the bullae detach from the megakaryocyte in a manner comparable to apocrine secretion and enter the blood stream.
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Dedicated to Professor Friedrich Wassermann with admiration and affection on the occasion of his 80th birthday.
This investigation was supported by a PHS research grant (CA 05493) from the U.S. Public Health Service.
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De Bruyn, P.P.H. The fine structure of the megakaryocyte of the bone marrow of the guinea pig. Z.Zellforsch 64, 111–118 (1964). https://doi.org/10.1007/BF00339190
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DOI: https://doi.org/10.1007/BF00339190