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The genes KOX 4 and KOX 9 , mapped on chromosome 8q24 , were found to be located within a DNA fragment of 450 kb .
 ( DNA: DNA fragment, None) , ( DNA: chromosome 8q24, None) , ( DNA: KOX 4, None) , ( DNA: KOX 9, 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: DNA fragment, None) , ( DNA: chromosome 8q24, None) , ( DNA: KOX 4, None) , ( DNA: KOX 9, None) 