2785
A more precise definition of the role of BCL-6 in normal and neoplastic B-cell development is the goal of ongoing study of transgenic mice engineered either to express BCL-6 under heterologous promoters or lacking BCL-6 function due to targeted deletions.
 ( DNA: heterologous promoters, None) , ( protein: BCL-6, None) , ( protein: BCL-6, None) , ( protein: BCL-6, 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: heterologous promoters, None) , ( protein: BCL-6, None) , ( protein: BCL-6, None) , ( protein: BCL-6, None) 