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The expression of the antibody-encoding genes , the immunoglobulin (Ig) genes , is also restricted to B cells .
 cell type: B cells; DNA: antibody-encoding genes; DNA: immunoglobulin (Ig) 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:
 cell type: B cells; DNA: antibody-encoding genes; DNA: immunoglobulin (Ig) genes