2250
5' to the identified transcription start site are two CCAAT sequences and potential recognition sites for several transcription factors including Sp1 , AP-1 , AP-2 , and NF-kB .
 ( protein: AP-2, None) , ( protein: transcription factors, None) , ( DNA: potential recognition sites, None) , ( DNA: CCAAT sequences, None) , ( DNA: transcription start site, None) , ( protein: AP-1, None) , ( protein: Sp1, None) , ( protein: NF-kB, 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: AP-2, None) , ( protein: transcription factors, None) , ( DNA: potential recognition sites, None) , ( DNA: CCAAT sequences, None) , ( DNA: transcription start site, None) , ( protein: AP-1, None) , ( protein: Sp1, None) , ( protein: NF-kB, None) 