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The level of mRNA expression of the NM23 gene is significantly lower in cell lines that derive from more infiltrating primary melanomas than in cell lines obtained from less infiltrating tumours .
 ( cell line: cell lines, None) , ( DNA: NM23 gene, None) , ( protein: NM23, None) , ( cell line: 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:
 ( cell line: cell lines, None) , ( DNA: NM23 gene, None) , ( protein: NM23, None) , ( cell line: cell lines, None) 