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The specialized transducing phage lambdacI857S7drifd18 was used as a donor in a transductional mapping of four genes in the rif region of the Escherichia coli genome. The gene order was rts-2.9-rplL-0.8-rpoB, where the numbers indicate intermarker distances in kilobases. The possible orientation of these genes with respect to each other and to neighboring genes is discussed.
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