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Thermal-induction of the cI(Ind−) ts mutant. The optical density of cultures of K10693 [λimm933WcI(Ind−1)] (⧫), and K10717 [λimm933WcI(Ind− ts)] (○), is shown. Lysogens were grown at 42°C following a shift of log phase bacteria from 32°C. Host cell lysis, represented as a decrease in the culture optical density, is used as a qualitative measurement of prophage induction.
