839
The A site in the 21 bp repeat has strong homology with previously described binding sites for the transcription factor AP-2 .
 DNA: binding sites; protein: transcription factor AP-2; DNA: 21 bp repeat; DNA: A site
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DNA: binding sites; protein: transcription factor AP-2; DNA: 21 bp repeat; DNA: A site