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Northern RNA blot analysis of sigE transcripts during heterocyst development. Lanes are labeled with hours after nitrogen step-down from BG-11 to BG-110 medium. The upper panel shows a Northern RNA blot probed with a radioactive probe for sigE transcripts. The lower panel shows the ethidium bromide (Et-Br)-stained gel to show sample loading. Lane M, low-range ssRNA ladder (NEB) size marker.
