12864
Since neither DNA binding nor protein dimerization through the bZIP domain of HLF is required for this effect, we propose mechanisms whereby protein-protein interactions with the amino-terminal region of E2A allow the chimera to act as a transcriptional cofactor to alter the expression of genes regulating the apoptotic machinery in pro-B cells .
 ( protein: chimera, None) , ( protein: bZIP domain, None) , ( protein: HLF, None) , ( protein: E2A, None) , ( cell type: pro-B cells, 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: chimera, None) , ( protein: bZIP domain, None) , ( protein: HLF, None) , ( protein: E2A, None) , ( cell type: pro-B cells, None) 