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Breakage of LAP2b:RFP bridges in ATM-deficient cells. HeLa cells stably expressing LAP2b:RFP (white) were treated with 10 µM KU-55933 and analyzed by time-lapse fluorescence microscopy. Frames were taken every 10 min for 90 min. Time counters show minutes:seconds. Display rate is one frame per second. Related image stills are shown in Fig. S4 B.
