Abstract
Simian virus 40 replicating DNA was pulse labeled with alpha-32P-dATP using an acellular DNA replication system. Nascent DNA chains of less than 200 nucleotides (Okazaki pieces) were then isolated from the denatured replicating DNA by electrosieving through a polyacrylamide gel column. The purified Okazaki pieces were hybridized to separated strands of Bg1(1)+Hpa1 simian virus 40 DNA restriction fragments immobilized on nitrocellulose filters. Only strands with polarity of the DNA replication fork direction hybridized with Okazaki pieces. Hence, Okazaki pieces in simian virus 40 are synthesized against the DNA replication fork direction.
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