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(A) Northern blot analysis of erp transcripts. Isolate B31 was grown in culture medium at either a constant temperature of 23°C (labeled 23°C) or shifted from 23°C to 35°C (labeled 35°C). Filters were individually incubated with radiolabeled probes specific for the B31 gene indicated above each panel. (B) Each filter was rehybridized with a probe specific for the constitutively expressed flaB gene (7). RNA molecular size markers (in kilobases) are indicated to the left of each panel.
