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Northern blot analysis of yrbA and yrbB transcripts in various sigma factor-deficient cells. RNAs (10 μg) of cells of spoIIG41 (sigE), spoIIAC1 (sigF), spoIIIGΔ1 (sigG), and spoIIIC94 (sigK) mutant strains were subjected to Northern blot analysis with probes specific for yrbA (A) and yrbB (B). The times of harvest of the cells are shown at the top. Arrowheads indicate the positions of RNAs hybridized with the probes.
