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Because dephosphorylated (activated) pRB blocks transition from G1 to S phase of the cell cycle whereas phosphorylated (inactivated) pRB releases this growth arrest, we characterized the role of pRB in IL-6 -mediated MM cell growth .
 dephosphorylated (activated) pRB, pRB, IL-6, pRB, phosphorylated (inactivated) pRB, pRB
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:
 dephosphorylated (activated) pRB, pRB, IL-6, pRB, phosphorylated (inactivated) pRB, pRB