1018
These mutant proteins retained the ability to competitively inhibit kappa B - mediated transcriptional activation of the human immunodeficiency virus long terminal repeat but failed to efficiently transform chicken lymphoid cells both in vitro and in vivo .
 kappa B, human immunodeficiency virus long terminal repeat
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 kappa B, human immunodeficiency virus long terminal repeat