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Growth rates of B. breve UCC2003 and UCC2003∷phoP in CDM with different Pi concentrations: ●, 10 mM Pi, wild type; ■, 1 mM Pi, wild type; ▲, no Pi, wild type; ○, 10 mM Pi, mutant; □, 1 mM Pi, mutant; △, no Pi, mutant.