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The purified homodimer (two p50s ) of the DNA-binding subunit of NF-kappa B binds the B2 site of proenkephalin relatively better than does the heterotetramer (two p65s plus two p50s ) form of the factor.
 protein: p65s; DNA: B2; protein: DNA-binding subunit; protein: heterotetramer; protein: p50s; protein: NF-kappa B; protein: p50s; protein: homodimer
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: p65s; DNA: B2; protein: DNA-binding subunit; protein: heterotetramer; protein: p50s; protein: NF-kappa B; protein: p50s; protein: homodimer