13365
Examination of IkappaB alpha regulation revealed that TNF-alpha -mediated degradation of IkappaB alpha in both memory and naive T cells from the elderly was severely impaired, thus contributing to the lowered induction of the observed NFkappaB .
 IkappaB alpha, IkappaB alpha, NFkappaB, TNF-alpha
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, IkappaB alpha, NFkappaB, TNF-alpha