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Chaperone for flagella basal body P-ring formation ChapFlgA is a family similar to the SAF family, and includes chaperones for flagellar basal-body proteins and pilus-assembly proteins, FlgA, RcpB and CpaB. ChapFlgA is necessary for the formation of the P-ring of the flagellum, FlgI, which sits in the peptidoglycan layer of the outer membrane of the bacterium. FlgA plays an auxiliary role in P-ring assembly.
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