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Positive and negative regulation of immunoglobulin gene expression by a novel B-cell-specific enhancer element .
 DNA: immunoglobulin gene; DNA: B-cell-specific enhancer 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 gene; DNA: B-cell-specific enhancer element