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Effect of copper on motility. M. xanthus DK1622 cells were grown in the absence of copper and concentrated to an OD600 of 15. Ten microliters of these cells was spotted onto CTT agar plates containing 0.5% agar for S motility (circles) or 1.5% agar for A motility (squares) and the indicated copper concentrations. The diameter of the spots was determined at 96 h of incubation. Experiments were performed in triplicate. Error bars indicate standard deviations.
