842
Gel retardation and methylation interference studies revealed that bacterially produced AP-2 bound specifically and with high affinity to all three 21 bp repeats , and that it required the core sequence AGGC for specific binding .
 protein: bacterially produced AP-2; DNA: 21 bp repeats; DNA: core sequence; protein: AP-2
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:
 protein: bacterially produced AP-2; DNA: 21 bp repeats; DNA: core sequence; protein: AP-2