6394
NIK cannot phosphorylate IkappaB -alpha directly, but it appears to be a functionally important subunit, because mutated NIK inhibited stimulus-induced kappaB -dependent transcription more effectively than mutated IKK-alpha or -beta .
 IkappaB -alpha, NIK, NIK, IKK-alpha, IkappaB, -beta, kappaB
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 IkappaB -alpha, NIK, NIK, IKK-alpha, IkappaB, -beta, kappaB