11219
High levels of the DNA-binding activity of E2F in adult T-cell leukemia and human T-cell leukemia virus type I -infected cells : possible enhancement of DNA-binding of E2F by the human T-cell leukemia virus I transactivating protein , Tax .
 ( protein: E2F, None) , ( cell type: human T-cell leukemia virus type I -infected cells, None) , ( protein: Tax, None) , ( protein: E2F, None) , ( protein: human T-cell leukemia virus I transactivating protein, 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: E2F, None) , ( cell type: human T-cell leukemia virus type I -infected cells, None) , ( protein: Tax, None) , ( protein: E2F, None) , ( protein: human T-cell leukemia virus I transactivating protein, None) 