3704
The NB4 cell line , which is derived from the bone marrow of a patient with APL during relapse, can be used as a model system to study the growth and differentiation of APL cells .
 ( cell line: APL cells, None) , ( cell line: NB4 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: APL cells, None) , ( cell line: NB4 cell line, None) 