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Nucleolin is an abundant nucleolar protein which is believed to play a role in rDNA transcription or organization, or rRNA processing .
 rRNA, Nucleolin, rDNA, abundant nucleolar protein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 rRNA, Nucleolin, rDNA, abundant nucleolar protein