12084
We have recently cloned the carboxylesterase upstream sequence and showed its basal promoter activity in CHO cells .
 ( DNA: carboxylesterase upstream sequence, None) , ( DNA: basal promoter, None) , ( cell line: CHO 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:
 ( DNA: carboxylesterase upstream sequence, None) , ( DNA: basal promoter, None) , ( cell line: CHO cells, None) 