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At pH 7.4, AalbOBP37 (A) and AalbOBP39 (B) bind four selected ligands, and their affinities to indole were higher at pH 7.4 than those at pH 4.5 (C&D), which showed the binding affinities of AalbOBP37 and AalbOBP39 were affected by different pH condition. Methanol was used as solvent and showed the lowest binding affinity to both OBPs. Error bars show standard deviation.
