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The Journal of Cell Biology, Vol 37, 761-772, Copyright © 1968 by Rockefeller University Press

ARTICLE

REGULATION OF DNA REPLICATION IN THE NUCLEI OF THE SLIME MOLD PHYSARUM POLYCEPHALUM

: Transplantation of Nuclei by Plasmodial Coalescence



Sophie Guttes 1 and Edmund Guttes 1

1 From the Department of Biology, the Loyola University, Chicago, Illinois 60626

Nuclei in G2 phase of the slime mold Physarum polycephalum, when transplanted, by plasmodial coalescence, into an S-phase plasmodium, failed to start another round of DNA synthesis. In the reciprocal combination, S-phase nuclei in a G2-phase host continued DNA synthesis for several hours without appreciable decrease in rate. It is suggested that the beginning of DNA replication is determined by an event, either during or shortly after mitosis, which renders the chromosomes structurally competent for DNA replication.

Submitted on November 20, 1967
Revised on January 26, 1968


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