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The c-rel protooncogene encodes a subunit of the NF-kappa B -like family of transcription factors .
 transcription factors, c-rel protooncogene, NF-kappa B -like family of transcription factors, NF-kappa B
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:
 transcription factors, c-rel protooncogene, NF-kappa B -like family of transcription factors, NF-kappa B