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By using a DNA sequence selected for its ability to bind recombinant BCL-6 in vitro, we show here that BCL-6 is present in DNA-binding complexes in nuclear extracts from various B-cell lines .
 ( cell line: B-cell lines, None) , ( protein: DNA-binding complexes, None) , ( protein: BCL-6, None) , ( DNA: DNA sequence, None) , ( protein: recombinant BCL-6, None) , ( protein: BCL-6, 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: B-cell lines, None) , ( protein: DNA-binding complexes, None) , ( protein: BCL-6, None) , ( DNA: DNA sequence, None) , ( protein: recombinant BCL-6, None) , ( protein: BCL-6, None) 