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The Journal of Cell Biology, Vol 77, 99-102, Copyright © 1978 by The Rockefeller University Press

ARTICLES

DNA polymerase activity in muscle cultures

GC Yeoh, D Greenstein and H Holtzer

Nuclei within myotubes do not synthesize DNA for replication. Accordingly, cultures of myotubes display low levels of DNA polymerase activity. The coincidental decline in DNA polymerase activity and increased formation of multinucleated myotubes during culture does not prove that the loss of capacity to synthesize DNA is a consequence of fusion. Tne experiments described demonstrate that myogenic cells prevented from fusing have low levels of DNA polymerase activity. This is consistent with the notion that, in myogenic cultures, there is a population of mononucleated cells, the myoblasts, which have withdrawn from the mitotic cycle before fusion.
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