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Cleavage of the intercellular canal in control cells. HeLa cells stably expressing tubulin:GFP were analyzed by phase-contrast time-lapse microscopy in cytokinesis. Frames were taken every 5 min for 60 min. The intercellular canal is shown by an arrow. Time counters show minutes:seconds. Display rate is one frame per second. Related image stills are shown in Fig. S1 A.
