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Unlike other class II promoters , the HLA-DR alpha (DRA) promoter also contains one element identical to the "octamer" motif of immunoglobulin variable region promoters that is responsible for B cell-specific transcription .
 DNA: "octamer" motif; DNA: HLA-DR alpha (DRA) promoter; DNA: class II promoters; DNA: immunoglobulin variable region promoters
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" motif; DNA: HLA-DR alpha (DRA) promoter; DNA: class II promoters; DNA: immunoglobulin variable region promoters