1031
These results constitute the first formal demonstration that these genes are regulated by members of the rel/ NF-kappa B family .
 protein: NF-kappa B; protein: rel/ NF-kappa B family
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: NF-kappa B; protein: rel/ NF-kappa B family