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ZEBRA is a bZIP transcriptional activator which binds as a dimer to 7-bp response elements within EBV promoters and is directly involved in the stimulation of virus replication at the EBV lytic origin .
 7-bp response elements, EBV promoters, ZEBRA, EBV lytic origin, bZIP transcriptional activator
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:
 7-bp response elements, EBV promoters, ZEBRA, EBV lytic origin, bZIP transcriptional activator