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Schematic diagram of bacterial chemotaxis signal transduction. External stimuli trigger changes in protein modifications and protein-protein interactions that lead to behavioral responses generated by the flagellar motors, as described in the text. The proteins present in the E. coli chemotaxis system are shown as circles. CheC, CheD, and CheV (squares) are absent in E. coli but are present in a large number of other bacteria.
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