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The 'octamer' sequence , ATGCAAAT or its complement ATTTGCAT , is a key element for the transcriptional regulation of immunoglobulin genes in B-lymphocytes as well as a number of housekeeping genes in all cell types.
 DNA: 'octamer' sequence; DNA: immunoglobulin genes; cell type: B-lymphocytes; DNA: housekeeping genes
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: immunoglobulin genes; cell type: B-lymphocytes; DNA: housekeeping genes