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When the constructs were transfected into OCIM1 cells , which do not express zeta-globin , the zeta-globin promoters were at best 20% as active as the alpha-globin promoters .
 OCIM1 cells, promoters, zeta-globin promoters, zeta-globin, alpha-globin promoters, zeta-globin
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:
 OCIM1 cells, promoters, zeta-globin promoters, zeta-globin, alpha-globin promoters, zeta-globin