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The beta-globin promoter is important for recruitment of erythroid Kruppel-like factor to the locus control region in erythroid cells .
 beta-globin promoter, erythroid Kruppel-like factor, locus control region, erythroid cells
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:
 beta-globin promoter, erythroid Kruppel-like factor, locus control region, erythroid cells