5013
To develop a transformation system with a conditional Epstein-Barr virus nuclear antigen 2 ( EBNA2 ) gene , we fused the hormone binding domain of the oestrogen receptor to the N or C terminus of EBNA2 .
 ( protein: EBNA2, None) , ( protein: EBNA2, None) , ( DNA: Epstein-Barr virus nuclear antigen 2 ( EBNA2 ) gene, None) , ( protein: hormone binding domain, 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: EBNA2, None) , ( protein: EBNA2, None) , ( DNA: Epstein-Barr virus nuclear antigen 2 ( EBNA2 ) gene, None) , ( protein: hormone binding domain, None) 