558
Electrophoretic mobility shift assays using protein extracts from EBV- B cells and the IL-2 NF-chi B probe revealed the constitutive generation of chi B complexes in IL-2 -secreting cells consisting mainly of heterodimeric p50/p65 complexes .
 ( cell line: IL-2 -secreting cells, None) , ( protein: chi B complexes, None) , ( protein: heterodimeric p50/p65 complexes, None) , ( cell line: EBV- B cells, None) , ( protein: NF-chi B, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( cell type: B cells, None) , ( protein: protein extracts, 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: IL-2 -secreting cells, None) , ( protein: chi B complexes, None) , ( protein: heterodimeric p50/p65 complexes, None) , ( cell line: EBV- B cells, None) , ( protein: NF-chi B, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( cell type: B cells, None) , ( protein: protein extracts, None) 