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Interaction of nuclear extracts from various cell lines and tissue with the MNP site leads to the formation of fast-migrating protein-DNA complexes with similar but distinct electrophoretic mobilities .
 ( protein: fast-migrating protein-DNA complexes, None) , ( DNA: MNP site, None) , ( cell line: various cell lines, 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: fast-migrating protein-DNA complexes, None) , ( DNA: MNP site, None) , ( cell line: various cell lines, None) 