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Displacement of an E-box-binding repressor by basic helix-loop-helix proteins : implications for B-cell specificity of the immunoglobulin heavy-chain enhancer .
 ( DNA: immunoglobulin heavy-chain enhancer, None) , ( protein: basic helix-loop-helix proteins, None) , ( protein: E-box-binding repressor, 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: immunoglobulin heavy-chain enhancer, None) , ( protein: basic helix-loop-helix proteins, None) , ( protein: E-box-binding repressor, None) 