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Pulse-field gel of the R388-pCC1FOS recombinant plasmids obtained from the transformed and transduced cosmid libraries. Plasmids were isolated and separated by PFGE. P, PFGE marker; 1 k, 1-kb maker; lanes 1–6, plasmids chosen at random from the transformed substrate library; lanes 7–12, plasmids chosen at random from the transduced substrate library; lane 13, R388; lane 14, the empty pCC1FOS cosmid.
