extremely significantp <0.0001
In particular, compared with the level observed at 0 d (CK), the expression of pyrB (5-fold), flmH (8-fold), pilR (4-fold) and bopD (5-fold) reached extremely significant levels at 15 days (t=20.51, df=4, p <0.0001), 10 days (t=14.28, df=4, p <0.0001), 5 days (t=26.79, df=4, p <0.0001) and 10 days (t=32.57, df=4, p <0.0001), respectively ( Figure 6C ).