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EA stimulated HK17 autophosphorylation activity. (A) Concentration-dependent activation of the autophosphorylation activity of the HK17 histidine kinase (5 μM) was measured after 30 min of incubation in the presence of EA concentrations shown on the x axis. (B) Time course of HK17 (5 μM) autophosphorylation in the presence (▪) or absence (⧫) of EA (25 μM).
