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*Substance via MeSH
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*L-LYSINE
*TRITIUM
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The Journal of Cell Biology, Vol 29, 307-316, Copyright © 1966 by Rockefeller University Press

ARTICLE

CYTOPLASMIC GRANULE FORMATION IN MYELOCYTES : An Electron Microscope Radioautographic Study on the Mechanism of Formation of Cytoplasmic Granules in Rabbit Heterophilic Myelocytes



Martha E. Fedorko 1 and James G. Hirsch 1

1 From The Rockefeller University

The intracellular flow of tritiated lysine as revealed by electron microscope radioautography was studied in heterophilic myelocytes of rabbit marrow. Label over the Golgi complex rose to a maximum of 37% of total cytoplasmic grains 30 min after initial exposure to the tracer and fell to 11% after 3 to 4 hr of incubation. Coincident with decrease in label over the Golgi complex, grain counts over granules rose to 32% after 3 to 4 hr. The time sequence of incorporation and flow of tritiated lysine and the per cent distribution of label was similar in bone marrow myelocytes under in vivo and in vitro conditions. The results demonstrate a function of the Golgi complex in incorporating or packaging certain basic amino acids or proteins into cytoplasmic granules of heterophilic myelocytes.

Submitted on January 12, 1966


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