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The nature of CD40 -dependent signals in proliferating fresh human Epstein-Barr virus -negative B lymphocytes is currently unknown.
 human Epstein-Barr virus -negative B lymphocytes, CD40
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:
 human Epstein-Barr virus -negative B lymphocytes, CD40