Figure 5

Growth curves of Lactobacillus casei wild type strain BL23 (blue) and mutant strain BL393 (lacAB) (cyan) on sugar-free MRS with lactose. BL23 (red) and mutants BL393 (lacAB) (pink) and BL388 (nagA) (green) on sugar-free MRS supplemented with N-acetyllactosamine (LacNAc). Data presented are mean values based on at least three replicates. Error bars indicate standard deviations.