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Videos of rotating giardia, each of which was labeled on its surface with Alexa Fluor 584. (A) Head-on view of a giardia rotating clockwise around its axis at ∼3 revolutions per s. (B) Side view of another giardia rotating around its long axis at ∼3 revolution per s. Each set of videos was composed of consecutive frames shot at 20 frames per s. Bar, 5 μm.
