4130
The lymphocyte-specific immunoglobulin mu heavy-chain gene intronic enhancer is regulated by multiple nuclear factors .
 nuclear factors, immunoglobulin mu heavy-chain, lymphocyte-specific immunoglobulin mu heavy-chain gene intronic enhancer
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:
 nuclear factors, immunoglobulin mu heavy-chain, lymphocyte-specific immunoglobulin mu heavy-chain gene intronic enhancer