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The adult globin expressing cells displayed more extensive footprints than the fetal globin expressing cells in the 3' regulatory sequences of both the Agamma- and the beta- globin genes , suggesting a role of these 3' elements in beta-globin gene expression .
 3' elements, fetal globin expressing cells, 3' regulatory sequences, adult globin expressing cells, beta-globin gene
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:
 3' elements, fetal globin expressing cells, 3' regulatory sequences, adult globin expressing cells, beta-globin gene