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Locations of bacteriophage T4 origins of replication.

ABSTRACT

Partially replicated bacteriophage T4 DNA containing cytosine was isolated from cells 6.5 and 7 min after infection and cleaved with restriction endonuclease BglII or BamHI. Positions of replication eyes relative to the cleavage sites were observed by electron microscopy. Four groups of eyes were found. They are consistent with replication from origins located at map positions 34, 60, 73, and 86 kilobases. In individual molecules that contained two or three eyes, the distribution of the eyes agreed with the initiation of replication at more than one of these four assigned origins and possibly at two additional origins located near 15 and 110 kilobases, which were reported by P. M. Macdonald, R. M. Seaby, W. Brown, and G. Mosig (p. 111-116, in D. Schlessinger, ed., Microbiology--1983, 1983) and M. E. Halpern, T. Mattson, and A. W. Kozinski (Proc. Natl. Acad. Sci. U.S.A. 76:6137-6141, 1979).

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