634
In contrast, NF-kappa B p50 alone fails to stimulate kappa B-directed transcription , and based on prior in vitro studies, is not directly regulated by I kappa B .
 protein: NF-kappa B p50; protein: I 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: NF-kappa B p50; protein: I kappa B