Figure 2. Schematic illustration of basic chemotactic signal transduction pathway. The proteins involved in the basic chemotactic signal transduction pathway are shown. The excitation response involves signal reception by the chemoreceptors (MCP) and further signal transduction via CheW, CheA, and CheY to the flagella motor. Adaptation is achieved via methylation/demethylation of the MCPs by CheR and CheB. See text for details.