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ts13 cells were transfected with a firefly luciferase reporter plasmid driven by the X gene core promoter 2 or the cyclin A promoter. After 16 hr of incubation at the permissive (33.5°C) or nonpermissive (39.5°C) temperature, the luciferase activity in transfected cells were measured and normalized for transfection efficiency. Brackets show standard error of means.
