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Analysis of interactions with SA by quenching or enhancement of fluorescence. PB was excited at 400 nm, and the intensity of fluorescence emission at 460 nm was measured. (A–C) Quantification of Kd values for direct binding. (D) Fluorescence resulting from competition of 20 for SA bound to probe 18 (25 nM). In (D), because of the poor fit to the binding model, the Ki value was not calculated.
