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φ(sif-lacZ) expression. φ(sif-lacZ) expression was measured by determining β-galactosidase activity in Miller units. (A) φ(sif2-lacZ); (B) φ(sif6-lacZ); (C) φ(sif15-lacZ). Open columns represent the activity in exponential phase, and solid columns represent the activity in stationary phase. Each column represents the average of three independent cultures grown under the conditions indicated. The error bars indicate the ranges of β-galactosidase activities measured.
