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To define further the relation between Stat3 activation and enhanced IgM production , we determined the effect of chimeric gp130 on the transcriptional activation of a genetic element linked to immunoglobulin production , namely the immunoglobulin heavy chain enhancer ( IgH-enhancer ).
 Stat3, immunoglobulin, IgH-enhancer, immunoglobulin heavy chain enhancer, IgM
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:
 Stat3, immunoglobulin, IgH-enhancer, immunoglobulin heavy chain enhancer, IgM