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The Journal of Cell Biology, Vol 15, 451-462, Copyright © 1962 by Rockefeller University Press

ARTICLE

ELECTRON MICROSCOPIC STUDY OF THE ATPASE ACTIVITY OF THE BAI STRAIN A (MYELOBLASTOSIS) AVIAN TUMOR VIRUS

Alex B. Novikoff Ph.D.1, Guy de Thé M.D.1, D. Beard 1, and J. W. Beard M.D.1

1 From the Pathology Department, Albert Einstein College of Medicine, New York City, and the Department of Surgery, Duke University Medical Center, Durham, North Carolina

Thymus glands of chicks with leukemia induced by BAI strain A (myeloblastosis) virus were fixed in cold 4 per cent formaldehyde-sucrose. Frozen sections were incubated in the ATPase medium of Wachstein and Meisel and studied by light microscopy and electron microscopy. The ATPase activity of the virus is localized to the outermost membrane of the virus. The membrane of the blast-like cells of the thymus cortex from which the virus emerges, by budding, also possesses such activity. It appears likely that the outermost membrane of the virus is derived from the plasma membrane of these cells.

Submitted on June 14, 1962


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