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Images of riboswitches B and C controlling the expression of a MamK-GFP fusion in M. magneticum in the presence of theophylline (1 mM) as a function of time. Left panels are phase-contrast images; right panels monitor GFP fluorescence emission (2-μm scale bar). All fluorescent images were exposed for 6 s, and the cells were visualized with a 100× objective.
