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Previously we demonstrated that heterologous activation domains can fully substitute for the ZEBRA activation domain .
 ZEBRA activation domain, ZEBRA, heterologous activation domains
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:
 ZEBRA activation domain, ZEBRA, heterologous activation domains