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Thermal death curves for vegetative cells of strain E13, which carries a chromosomal cpe gene, and strain F5603, which carries a plasmid cpe gene. Vegetative (FTG medium) cultures of E13 and F5603 were heated at 55°C for specified times, and the number of viable bacteria per milliliter of each heated culture was then determined (see Materials and Methods). The results are the results of representative experiments; these results were highly reproducible (data not shown).
