3747
Both phosphorylated and dephosphorylated pRB were expressed in all serum-starved MM patient cells and MM-derived cell lines , but pRB was predominantly in its phosphorylated form.
 ( protein: pRB, None) , ( cell line: MM-derived cell lines, None) , ( protein: pRB, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: pRB, None) , ( cell line: MM-derived cell lines, None) , ( protein: pRB, None) 