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All immunoglobulin genes contain a conserved octanucleotide promoter element , ATGCAAAT , which has been shown to be required for their normal B-cell-specific transcription .
 DNA: immunoglobulin genes; DNA: octanucleotide promoter element
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: immunoglobulin genes; DNA: octanucleotide promoter element