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Time lapses of MMP ping-pong trajectories at 1.7 mT. Successive images are taken 0.1 s apart at near the air-water interface. The interface is at ∼20 μm from the right of the figure with air on the left and water on the right. A uniform magnetic field of 1.7 mT is present in the direction right to left. The paths were followed until the MMPs swam below the plane of focus.
