9080
To delineate the universe of endogenous circular RNAs , we performed high - throughput sequencing ( RNA - seq ) of libraries prepared from ribosome - depleted RNA with or without digestion with the RNA exonuclease , RNase R .
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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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