Fig. 4From: Implementation of the agmatine-controlled expression system for inducible gene expression in Lactococcus lactis Comparison of PEP activity. a In the NICE system, PEP activity was monitored in L. lactis NZ9000 pNZ8048-pep cells induced at different nisin concentrations for 3 h after reaching OD600, while b in the ACE system, PEP activity was monitored in L. lactis NZ9000 pACE-pep cells induced with different agmatine concentrations (added to the culture medium before inoculation) after 7 h of growth. Data represent the mean of three independent experiments. Bars indicate standard deviations (*p < 0.05)Back to article page