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Nucleolin is one component of the B cell-specific transcription factor and switch region binding protein , LR1 .
 B cell-specific transcription factor, LR1, switch region binding protein, Nucleolin
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:
 B cell-specific transcription factor, LR1, switch region binding protein, Nucleolin