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Wild-type and frz M. xanthus adapted differently to PE stimulation. Wild-type (a), frzCD null mutant (b), and frzE mutant (c) M. xanthus cells were incubated for 2 hr in the presence (closed symbols) and absence (open symbols) of 2 μg PE C12. Reversal frequencies were determined at 20-min intervals. Error bars are the SD of three replicates.
