The present invention describes a mutant plasmid replication control region having the ability to convey temperature sensitivity to the plasmid on which it resides. The mutant replication control region is based on a similar region isolated from pBRH1. Plasmids containing this rggeplication control region cannot be classed as belonging to any known incompatibility group and thus may co-exist with a broad range of other plasmids in a single host.

 
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