868
Together, these data suggest the TR2RE- SV40 may represent the first identified natural DNA response element for the TR2 orphan receptor that may function as a repressor for the SV40 gene expression .
 ( DNA: TR2RE- SV40, None) , ( DNA: DNA response element, None) , ( protein: TR2 orphan receptor, 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: TR2RE- SV40, None) , ( DNA: DNA response element, None) , ( protein: TR2 orphan receptor, None) 