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Recently , we reported that two homologous yeast proteins , Rai1 and Dxo1 , function in a quality control mechanism to clear cells of incompletely 5 ' end - capped messenger RNAs ( mRNAs ) .
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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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