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This kind of drugs induced a cell cycle block that increased the number of cells with a 2n complement of DNA (e.g., G1/S cell cycle block).

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At  low concentrations, "drug A"  produced a large population of cells
containing a 4n complement of DNA, but higher concentrations of
the drugs induced a shift in the majority of the population to contain
a 2n complement.

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"a 4n complement of DNA"  £¬  "a 2n complement"
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