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20 μl of ddH2O or 2.5% bromophenol blue solution was dropped on the colony surfaces of the WT strain (CX-3), clvelB deletion mutant (ΔClVelB), and complemented strain (ClVelB-C), and photographed 10 min later. The droplet did not disperse on the colony of ΔClVelB, WT, and ClVelB-C.
