11860
Regulation of immunoglobulin heavy chain (IgH) gene expression is controlled by a B cell-specific promoter , intronic enhancer and additional B cell-specific enhancer elements identified recently in the 3' end of the IgH locus .
 intronic enhancer, B cell-specific promoter, IgH locus, immunoglobulin heavy chain (IgH) gene, B cell-specific enhancer elements
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 intronic enhancer, B cell-specific promoter, IgH locus, immunoglobulin heavy chain (IgH) gene, B cell-specific enhancer elements