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Functional CodY protein in S. thermophilus ST2017. (A) PCR validation of the codY mutant. (B) Final biomass levels of S. thermophilus ST2017, ST2017ΔcodY, and ST2017ΔcodY-codYexp. Asterisks indicate statistically significant differences (*, P < 0.001; **, P < 0.01) between the values obtained for the ΔcodY mutant strain and those obtained for wild-type (ST2017) and complemented (ΔcodY-codYexp) cells.
