Fig. 4: Bt-FAST and Bt-GFP signals diverge at the characteristic time t1.

Kinetics of the fluorescence intensity, Fl, from Bt-FAST and Bt-GFP grown in parallel channels in the 4S biofilm. The curves represent the average of at least three independent measurements. The arrow indicates time t = 5 h, when the GFP and FAST signals diverged. The insert shows a zoom in on the first 8 h of biofilm formation. The same experimental conditions were used as in Fig. 3a.