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Illustration of the assembly of a chemosensory array. Only P3 and P5 domains of CheA are shown in the figure. The core functional unit of signaling complexes involves two trimers of receptor dimers interacting with two CheW proteins and one CheA dimer [41]. The CheA P5 domains and CheW form rings to link trimers of receptor dimers into hexagons. The CheA P3 domains link hexagons to form extended sensory arrays [44, 46]. This figure is drawn based on Refs. [44, 46, 47]
