14361
In order to apprehend the role of the HIV1 tat gene in inducing the differentiation of HIV1 -infected U937 cells , we have successfully introduced this gene into U937 cells by infecting them with retroviral particles transducing tat .
 ( cell line: U937 cells, None) , ( DNA: tat, None) , ( cell line: U937 cells, None) , ( cell line: HIV1 -infected U937 cells, None) , ( DNA: HIV1 tat gene, 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: U937 cells, None) , ( DNA: tat, None) , ( cell line: U937 cells, None) , ( cell line: HIV1 -infected U937 cells, None) , ( DNA: HIV1 tat gene, None) 