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Sequence of images demonstrating the positioning of an embryo by control of phase lag. The embryo is moved toward the left when the phase lag ϕ=0° from t=0 to 5.7 s; toward the right when the phase lag ϕ=180° from t=5.7 to 17.1 s. The frequency is 10 Hz, the driving electric field is 15 V∕cm, and the gate potential is 400 V.
