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Sensitivity of PhoB-P and CheA-P to imidazole. (A) Phosphorimaging scans showing the loss of 32P from [32P]PhoBN-P in the absence (top panel) or presence (bottom panel) of 500 mM imidazole at pH 7.5. (B) Phosphorimaging scan showing [32P]CheA-P after a 1-hour incubation with different concentrations of imidazole at pH 7.5.
