763
Using either a p50 - or p65 - selected kappa B motif , which displayed differential binding with respect to the other protein , little to no binding was observed with the heterodimeric NF - kappa B complex .
 p50, p65 - selected kappa B motif, heterodimeric NF - kappa B complex
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 p50, p65 - selected kappa B motif, heterodimeric NF - kappa B complex