from the data described in this paper we conclude : ( i ) each clo df13 plasmid molecule has an equal chance of colonizing daughter cells upon cell division , ( ii ) the clo df13 minimal replicon harbours functions involved in plasmid segregation and incompatibility , ( iii ) in the case of cells harbouring plasmid replicons which differ in size , the smaller plasmid is gradually lost from the cell population , ( iv ) in the case of cells habouring plasmid replicons which differ in copy number , the lower copy number plasmid is always lost from the cell population .
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