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Transcriptional read-through of terminators in different nusA mutants. The read-through of the terminators T1 and T2 between metY and p15a (A) and that of the attenuator upstream from rpsP (B) were calculated as the ratio of the β-galactosidase activity from a lacZ fusion containing the respective terminator(s) to the activity from a fusion lacking the terminator(s) in the genetic backgrounds indicated. The standard deviations are shown as error bars.
