5099
We show here that AM580 , a stable retinobenzoic derivative originally synthesized as a RAR alpha agonist , is a powerful inducer of granulocytic maturation in NB4 , an APL -derived cell line , and in freshly isolated APL blasts .
 ( cell line: NB4, None) , ( protein: RAR alpha, None) , ( cell type: freshly isolated APL blasts, None) , ( cell line: APL -derived cell line, 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:
 ( cell line: NB4, None) , ( protein: RAR alpha, None) , ( cell type: freshly isolated APL blasts, None) , ( cell line: APL -derived cell line, None) 