2690
Evidence for a trans-acting activator function regulating the expression of the human CD5 antigen .
 ( protein: CD5, None) , ( protein: human CD5 antigen, None) , ( protein: trans-acting activator, 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: CD5, None) , ( protein: human CD5 antigen, None) , ( protein: trans-acting activator, None) 