601
We demonstrated by electrophoretic mobility shift assay , electrophoretic mobility shift assay with antibody, UV cross-linking followed by SDS-gel electrophoresis , and Western analysis that Nm23H2 in B cell nuclear extracts bound to the c-myc PuF site .
 ( protein: Nm23H2, None) , ( DNA: PuF site, 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: Nm23H2, None) , ( DNA: PuF site, None) 