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Culture‐induced egfp fluorescence of E. coli‐expressing HbpR wild type, mutants D128N, I101V or CBP‐6 and the double mutant I101V, D128N after 2.5 h exposure at 30°C to 2‐HBP or 2‐CBP at 16 and 80 µM respectively. Ordinate expressed as ‐fold induction, i.e. compared with cultures in buffer only. Error bars represent the additive errors in both sample and blanc measurements.
