11076
EMS analyses performed with nuclear extracts from Tax -expressing Jurkat cells and HTLV-I -transformed peripheral blood mononuclear cells demonstrate that Tax prevents the formation of U1 ( U1A/U1B ) and U2 DNA-protein complexes .
 ( cell line: Tax -expressing Jurkat cells, None) , ( cell type: HTLV-I -transformed peripheral blood mononuclear cells, None) , ( protein: Tax, None) , ( protein: DNA-protein complexes, None) , ( DNA: U2, None) , ( protein: Tax, None) , ( DNA: U1, None) , ( DNA: U1A/U1B, 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: Tax -expressing Jurkat cells, None) , ( cell type: HTLV-I -transformed peripheral blood mononuclear cells, None) , ( protein: Tax, None) , ( protein: DNA-protein complexes, None) , ( DNA: U2, None) , ( protein: Tax, None) , ( DNA: U1, None) , ( DNA: U1A/U1B, None) 