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We have identified a cDNA clone , DR-nm23 , differentially expressed in a blast-crisis cDNA library, which has approximately 70% sequence similarity to the putative metastatic suppressor genes , nm23-H1 and nm23-H2 .
 ( DNA: putative metastatic suppressor genes, None) , ( protein: DR-nm23, None) , ( DNA: nm23-H2, None) , ( DNA: cDNA clone, None) , ( DNA: blast-crisis cDNA library,, None) , ( DNA: nm23-H1, 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:
 ( DNA: putative metastatic suppressor genes, None) , ( protein: DR-nm23, None) , ( DNA: nm23-H2, None) , ( DNA: cDNA clone, None) , ( DNA: blast-crisis cDNA library,, None) , ( DNA: nm23-H1, None) 