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B. Exposure to substance X after the cells have crossed the R point arrests the cells before S phase. True

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C. Cells are accumulated before  S phase, because the FACS analysis was performed too soon and the cells did not have enough time to enter S phase - False FACS analysis was performed on cells harvested 16 hrs after CS readdition. At this time around 40% of the cells were found in S-phase.

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