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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 .
 recombinant BCL - 6, BCL - 6
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 recombinant BCL - 6, BCL - 6