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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 .
 Nm23H2, PuF site
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 Nm23H2, PuF site