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ns. The targets have been considered passive in this process. Our characterization of interaction between response regulator CheB and its target chemoreceptor revealed active participation of the target in response regulator action. We found that a pentapeptide sequence at the carboxyl terminus of Escherichia coli chemoreceptors is a selective tether that binds only phosphorylated CheB, thus selecting the form of this two-component enzyme active for covalent modification of the selecting chemoreceptor. Analogous pentapeptides are found