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In erythroid cells most of the transcription activity was contained in a 150 bp promoter fragment with binding sites for transcription factors AP2 , Sp1 and the erythroid-specific GATA-1 .
 ( DNA: binding sites, None) , ( protein: transcription factors, None) , ( DNA: 150 bp promoter, None) , ( protein: erythroid-specific GATA-1, None) , ( protein: Sp1, None) , ( cell type: erythroid cells, None) , ( protein: AP2, 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: binding sites, None) , ( protein: transcription factors, None) , ( DNA: 150 bp promoter, None) , ( protein: erythroid-specific GATA-1, None) , ( protein: Sp1, None) , ( cell type: erythroid cells, None) , ( protein: AP2, None) 