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Autonomous-replicating plasmid pFP4 of Streptomyces sp. FR1 isolated from a heavy metal-contaminated land was cloned and sequenced. Surprisingly, the 40,949-bp pFP4 contains a cluster of 20 genes, resembling these chromosome-integrated prophages of Streptomyces sp. SPB78 and Streptomyces scabiei 87.22. Plasmid pFP4 could transfer by conjugation and a replication locus, iteron/repA/repB, was identified...
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