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The function of the zeta-globin promoter was studied using a series of zeta-globin promoter deletion constructs to drive luciferase expression in transiently transfected human erythroleukemia cells .
 zeta-globin promoter, transiently transfected human erythroleukemia cells, zeta-globin promoter, luciferase, zeta-globin promoter deletion constructs
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:
 zeta-globin promoter, transiently transfected human erythroleukemia cells, zeta-globin promoter, luciferase, zeta-globin promoter deletion constructs