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The octamer sequence ATGCAAAT is present in the promoter and the enhancer of Ig genes , and plays an important role in its tissue-specific expression .
 DNA: octamer sequence; DNA: enhancer; DNA: Ig genes; DNA: promoter
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: octamer sequence; DNA: enhancer; DNA: Ig genes; DNA: promoter