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As the attached bacteria rotate their flagella they push the microsphere forward. The on/off motion of the microspheres is controlled by introducing different chemicals into the experimental environment. To stop the motion, copper ions are introduced. These ions bond to the rotor of the flagellar motor and prevent its motion. To resume the motion we introduce another chemical called ethylenediaminetetraacetic acid (EDTA), which traps the copper ions attached to the rotor of the flagellar motor, allowing it to resume its motion.