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This factor is present in an active form in a variety of cell types but is apparently unable to bind to the endogenous Ig heavy chain enhancer in non-B cells , perhaps due to a non-permissive chromatin structure of the Ig heavy chain locus .
 DNA: Ig heavy chain locus; DNA: chromatin; DNA: endogenous Ig heavy chain enhancer; DNA: Ig heavy chain enhancer; cell type: non-B cells
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: Ig heavy chain locus; DNA: chromatin; DNA: endogenous Ig heavy chain enhancer; DNA: Ig heavy chain enhancer; cell type: non-B cells