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The promoter of the major histocompatibility class II gene DRA contains an octamer element ( ATTTGCAT ) that is required for efficient DRA expression in B cells .
 DNA: DRA; DNA: octamer element; cell type: B cells; DNA: DRA; DNA: major histocompatibility class II gene
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: DRA; DNA: octamer element; cell type: B cells; DNA: DRA; DNA: major histocompatibility class II gene