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(a) The relationship between 4,5-dihydroxy-2,3-pentanedione (DPD) concentration and fold induction of bioluminescence by Vibrio harveyi BB170. Values below a fold induction of 2 (dotted horizontal line) were considered to be background. Data points with circles around them were used for regression analysis (b) to allow for the calculation of DPD (autoinducer-2) concentrations based upon fold induction values (R2 = 0.9938).
