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McpA and TlpA are the principal chemoreceptors involved in the acid response, and McpB and TlpB are the sole chemoreceptors involved in the base response. (A) Responses of strains expressing just one chemoreceptor to pH gradients. (Inset) Responses of strain overexpressing tlpA as its sole chemoreceptor. (B) Responses of mutants lacking key receptors to pH gradients. Error bars denote the standard deviations from three biological replicates performed on three separate days.
