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Nonrandom cosmid cloning and prophage SP beta homology near the replication terminus of the Bacillus subtilis chromosome

From a library of Bacillus subtilis DNA cloned with the Escherichia coli cosmid vector pHC79, 85 recombinant cosmids containing DNA from near the replication terminus, terC, were identified. The DNA inserts of these cosmids were confined to three regions of a 350-kilobase segment of the chromosome extending from the left end of the SP beta prophage to approximately 75 kilobases on the right of terC. All B. subtilis genes known to reside in this segment, as well as the portion of the SP beta prophage that is expressed early in the lytic cycle of the phage, appeared to be absent from the library. A region of SP beta homology distinct from the prophage and just to the left of terC was identified.