Paramecium reacting to a localized heating from a focused laser. This cell escapes sideways to a lateral aggression. Swimming sideways is not possible with the cilia. Video filmed at 1000 images/sec. Laser position is just near the Paramecium, at the right hand side.
See Hamel et al, PNAS, vol. 108 no. 18 7290-7295, for full story.
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