12805
We have found that the beta-casein gene is expressed in a cytotoxic T cell line , CTLL-2 , in response to interleukin-2 ( IL-2 ), which activates STAT5 .
 ( cell line: CTLL-2, None) , ( protein: IL-2, None) , ( DNA: beta-casein gene, None) , ( protein: interleukin-2, None) , ( cell line: cytotoxic T cell line, None) , ( protein: beta-casein, None) , ( protein: STAT5, 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: CTLL-2, None) , ( protein: IL-2, None) , ( DNA: beta-casein gene, None) , ( protein: interleukin-2, None) , ( cell line: cytotoxic T cell line, None) , ( protein: beta-casein, None) , ( protein: STAT5, None) 