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In most cases, the transcriptional factor NF-kappa B is a heterodimer consisting of two subunits, p50 and p65 , which are encoded by two distinct genes of the Rel family .
 protein: heterodimer; protein: p65; DNA: Rel family; protein: p50; protein: transcriptional factor; protein: NF-kappa B
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: heterodimer; protein: p65; DNA: Rel family; protein: p50; protein: transcriptional factor; protein: NF-kappa B