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Expression of nucleoside diphosphate(NDP) kinase , which is homologous to the nm23 gene product in a variety of species, has been found to be inversely associated with metastatic potential .
 ( protein: nucleoside diphosphate(NDP) kinase, None) , ( DNA: nm23 gene, None) , ( protein: nm23 gene product, 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: nucleoside diphosphate(NDP) kinase, None) , ( DNA: nm23 gene, None) , ( protein: nm23 gene product, None) 