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Disrupting Qrr4 regulation of LuxR or LuxO alone does not impair bioluminescence in V. harveyi (related to Fig. 6). Light production in V. harveyi following expression of WT or the designated Qrr4 mutants. Blue denotes nucleotides essential for luxR regulation, and pink denotes nucleotides essential for luxO regulation. In all panels, error bars are SDs of at least three trials.
