8020
Dephosphorylation of 4E-BP1 was also observed when U-937 cells were induced to differentiate into monocytes /macrophages following treatment with retinoic acid or DMSO .
 ( cell type: monocytes /macrophages, None) , ( protein: 4E-BP1, None) , ( cell type: monocytes, None) , ( cell line: U-937 cells, 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 type: monocytes /macrophages, None) , ( protein: 4E-BP1, None) , ( cell type: monocytes, None) , ( cell line: U-937 cells, None) 