4371
Interferons as well as retinoids inhibit the growth of NB4 cells , although the 2 classes of compounds do not significantly interact in terms of anti-proliferative activity .
 ( cell line: NB4 cells, None) , ( protein: Interferons, 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 cells, None) , ( protein: Interferons, None) 