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THE CYTOCHEMISTRY AND ULTRASTRUCTURE OF POLYPEPTIDE HORMONE-PRODUCING CELLS OF THE APUD SERIES AND THE EMBRYOLOGIC, PHYSIOLOGIC AND PATHOLOGIC IMPLICATIONS OF THE CONCEPT
A. G. E. PEARSE 1
1 Royal postgraduate Medical School, London, England
A group of apparently unrelated endocrine cells, some in endocrine glands, others in nonendocrine tissues, share a number of cytochemical and ultrastructural characteristics. These characteristics, from the initial letters of four of which the term APUD is derived, indicate the possession of a common metabolic pattern and common synthetic, storage and secretion mechanisms. It is postulated that the various characteristics reflect the production and storage of hormone precursor protein which has a predominantly random coil conformation. Several explanations are possible to account for the APUD characteristics but if the cells, in fact, share a common ancestor the only possible candidate is the neural crest cell.
Submitted on January 2, 1969

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The Journal of Histochemistry & Cytochemistry
is owned, published, and licensed by
The Histochemical Society © 1969
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