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In vivo time course of cleavage furrow in living spermatocytes under oil. Panels in each set are consecutive images taken at 5-min intervals. In wild type (wt), a furrow is initiated ∼10 min after anaphase onset (left panel of the set) and continues to progress through the time course. In the fun and fsco mutants, the furrow also initiates ∼10 min after anaphase onset but shows a limited ingression and then regresses leading to a failure of cytokinesis. Bar, 10 μm.
