Fig. 7From: Engineering integrative vectors based on phage site-specific recombination mechanism for Lactococcus lactisWhole-cell ELISA of induction time optimisation (from 0 to 8 h induction) for surfaced displayed nuclease on different integrated L. lactis constructs. abcde common letter on the bars mean no significance difference on the expression of nuclease by the respective integrative vectors (P < 0.05)Back to article page