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Chromosome fragmentation in ATR
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cells. Shown here is an analysis of ATR
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blastocysts cultured in the presence of nocodozole and stained with Hoechst to visualize the DNA. Extensive fragmentation of the chromosomes is seen. The level of fragmentation was similar to that seen in blastocysts treated with caspase-3 inhibitor (not shown). (For details, see Brown and Baltimore, p. 397.)