904
Specifically , in the nucleolus , c - Myc has been shown to be recruited to ribosomal DNA and activate RNA polymerase ( pol ) I - mediated transcription of ribosomal RNA ( rRNA ) genes .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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