1106
Virus isolated from IFNA -producing cells was able to replicate in the U937 cells but did not replicate efficiently in U937 cells transduced with the IFNA gene .
 ( protein: IFNA, None) , ( cell line: U937 cells, None) , ( cell line: IFNA -producing cells, None) , ( DNA: IFNA gene, None) , ( protein: IFNA, None) , ( cell line: U937 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:
 ( protein: IFNA, None) , ( cell line: U937 cells, None) , ( cell line: IFNA -producing cells, None) , ( DNA: IFNA gene, None) , ( protein: IFNA, None) , ( cell line: U937 cells, None) 