4074
Chloramphenicol acetyltransferase ( CAT ) activities directed by 5' upstream promoter were detected preferentially in perforin-expressing cell lines .
 ( protein: CAT, None) , ( protein: Chloramphenicol acetyltransferase, None) , ( cell line: perforin-expressing cell lines, None) , ( DNA: 5#$%# upstream promoter, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: CAT, None) , ( protein: Chloramphenicol acetyltransferase, None) , ( cell line: perforin-expressing cell lines, None) , ( DNA: 5#$%# upstream promoter, None) 