Fig. 2

Effects of different expression levels of lgtA and lgtB genes. a LNTII, LNnT titer of BY02 and BY03, DCW and rate of glucose consumption in BY02 and BY03; b LNTII, LNnT titer of BY04–BY07, and DCW in BY04–BY07, the** mean p < 0.01; c LNnT production rate, and yield on glucose in BY02, BY03 and BY04; d LNnT titer and lactose concentration of BY06, when cultivated with 5 g/L lactose and 10 g/L lactose. Triplicate experiments were done, and error bars represent the standard deviation