3751
Although CD40 ligand ( CD40L ) triggers a shift from dephosphorylated to phosphorylated pRB and proliferation of B cells , the addition of exogenous IL-6 to CD40L -treated B cells does not alter either pRB or proliferation, as observed in MM cells .
 CD40 ligand, B cells, IL-6, pRB, B cells, CD40L, MM cells, pRB, CD40L
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:
 CD40 ligand, B cells, IL-6, pRB, B cells, CD40L, MM cells, pRB, CD40L