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Antibodies against CRE -binding (CREB) protein but not against c-Fos or c-Jun were able to supershift the DNA-protein complex , identifying the nature of the transcription factor which binds to ZII as a member of the CREB family of proteins .
 DNA-protein complex, CRE, c-Fos, transcription factor, CRE -binding (CREB) protein, CREB family of proteins, ZII, c-Jun
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:
 DNA-protein complex, CRE, c-Fos, transcription factor, CRE -binding (CREB) protein, CREB family of proteins, ZII, c-Jun