pCP20 is an ampicillin and CmR plasmid that shows temperature-sensitive replication and thermal induction of FLP synthesis. CmR and KmR mutants were transformed with pCP20, and ampicillin-resistant transformants were selected at 30°C, after which a few were colony-purified once nonselectively at 43°C and then tested for loss of all antibiotic resistances. The majority lost the FRT-flanked resistance gene and the FLP helper plasmid simultaneously.
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