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The epsA-O and tapA-sipW-tasA operons are essential for bundle formation in the presence of lactose. The WT, ΔepsH and ΔtasA cells of B. subtilis were diluted into LB or LB supplemented with lactose. Cultures were incubated for 5 h at 37°C and 50 rpm. A sample from each culture was analyzed using a confocal microscope. Images are representative of two biological repeats.
