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. 1997 Mar 10;136(5):1081–1090. doi: 10.1083/jcb.136.5.1081

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Movement of polarity-marked microtubules in the plus direction. The microtubule minus end is nearest the rhodamine seed and is indicated by the arrow. (a) Microtubule position at t = 0. (b) Microtubule position at t = 6 min. The velocities are not as fast as those in the non–fluorescence-based assays, presumably owing to photodamage. Bar, 5 μm.