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Northern blot analysis of the entI operon. The purified DNA fragment that was cloned in pSIG108 and that contained both entI and orf2 was used as a probe. RNA molecular weight markers are indicated on the left. Forty micrograms of RNA was loaded in each lane. Lane 1, log phase of growth; lane 2, transition from log to stationary phase; lane 3, early stationary phase; lanes 4 and 5, late stationary phase (25 and 40 h of incubation, respectively).
