The error came to light when tissue samples were examined and were found to contain ovarian cells rather than cells from the appendix.

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Rather than killing cancer cells, these drugs remove the aberrant methylation, reactivating genes which had been silenced.

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Mass screening of this sort is not, itself, a new idea in the search for drugs, but extending it so that it can study effects on entire animals rather than just isolated cells should make it even more productive.

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