Fig. 4

Relative mRNA levels of ampG in T. forsythia wild-type cultures grown with MurNAc (black) or PGN (grey) until the exponential and stationary growth phase, respectively, as determined by qPCR. Standard errors of triplicates are shown and asterisks indicate significant differences between samples, determined by the unpaired Student’s t-test (**P ≤ 0.01, ***P ≤ 0.001)