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Figure 3. Reversible revolutions of a DNA-tethered bead caused by EtBr. (A and B) Snapshots of rotating beads for 2 s at 200 ms intervals after the addition (A; from 8'56'' in C) or the removal (B; from 10'10'' in C) of 1 µM EtBr. Arrows indicate the directions of the bead. Asterisks indicate completion of a turn. (C) Time course of bead rotation during the repeated change of EtBr concentration, 0 (–) and 1 µM (+). See also Movie S3 in Supplementary Data.
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