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Erwinia uredovora was lysogenized with phages Mucts62 and D108-1, a mini derivative of D108cts10 carrying a Cmr marker. The 20D3(Mucts62)(D 108-1) lysogen was induced and used as donor in a mating with a phage-resistant Escherichia coli; the Cmr marker was transferred to this recipient strain at low frequency. The analysis of the Cmr transconjugants indicated that they had acquired the pULG3 plasmid of E. uredovora associated with a D108-1 prophage. Subsequent transfer of these pULG3 derivatives within E. coli indicated that pULG3 was conjugative. Incompatibility experiments showed that pULG3 is a member of the IncM group.
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