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Interleukin-6 ( IL-6 ) is an important B-cell growth and differentiation factor .
 IL-6, Interleukin-6, B-cell growth and differentiation factor
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:
 IL-6, Interleukin-6, B-cell growth and differentiation factor