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The Ah receptor recognizes DNA binding sites for the B cell transcription factor , BSAP : a possible mechanism for dioxin-mediated alteration of CD19 gene expression in human B lymphocytes .
 ( DNA: CD19 gene, None) , ( cell type: human B lymphocytes, None) , ( protein: Ah receptor, None) , ( protein: transcription factor, None) , ( protein: BSAP, None) , ( DNA: DNA binding sites, None) , ( protein: B cell transcription factor, 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: CD19 gene, None) , ( cell type: human B lymphocytes, None) , ( protein: Ah receptor, None) , ( protein: transcription factor, None) , ( protein: BSAP, None) , ( DNA: DNA binding sites, None) , ( protein: B cell transcription factor, None) 