5019
It remains open whether the growth retarding property of the EBNA2 -oestrogen receptor fusion protein in B cell lymphoma lines is due to unphysiologically high expression of the chimeric protein or to interference with a cellular programme driving proliferation in these cell lines .
 ( protein: chimeric protein, None) , ( protein: EBNA2 -oestrogen receptor fusion protein, None) , ( cell line: B cell lymphoma lines, None) , ( protein: EBNA2, 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:
 ( protein: chimeric protein, None) , ( protein: EBNA2 -oestrogen receptor fusion protein, None) , ( cell line: B cell lymphoma lines, None) , ( protein: EBNA2, None) , ( cell line: cell lines, None) 