FIG 2.

(A) Final OD₆₀₀ values after 16 h of wild-type strain B. breve UCC2003 and insertion mutants B. breve UCC2003-melR1 and B. breve UCC2003-melR2 growth on 1% melezitose or 1% lactose. The results are mean values obtained from three separate experiments. The final optical densities reached by B. breve UCC2003 and insertion mutants B. breve UCC2003-melR1 and B. breve UCC2003-melR2 during growth on lactose or melezitose were not statistically significantly different (P < 0.1). (B) Final OD₆₀₀ values after 16 h of growth of wild-type strain B. breve UCC2003 and insertion mutant B. breve UCC2003-rafR on 1% stachyose, 1% raffinose, 1% melibiose, or 1% lactose. The final optical densities attained by B. breve UCC2003 compared to insertion mutant B. breve UCC2003-rafR during growth on 1% raffinose, 1% stachyose, or 1% melibiose were statistically significantly different (*, P < 0.001; **, P < 0.01). No significant difference (P < 0.1) was observed in the final optical densities achieved by B. breve UCC2003 and B. breve UCC2003-rafR during growth on 1% lactose. The error bars indicate standard deviations.