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We demonstrate that DCS - 1 interacts with the exonuclease XRN - 1 to promote microRNA degradation in an independent manner from its known decapping scavenger activity , establishing two molecular functions for DCS - 1 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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