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Temporal expression pattern of the mat promoter. Strains carrying the temperature-sensitive P1 prophage P1-15::Tn2680 and one of the three indicator plasmids, pHAL257 (circles), pAW533 (boxes), and pAW919 (triangles), were assayed for β-galactosidase activity under inducing (42°C, filled symbols) and noninducing (30°C, open symbols) conditions. The values shown represent averages of six independent measurements and standard deviations are indicated.
