1149
On the basis of Western blotting experiments using antibodies to kappa B/Rel family proteins , the kappa B-binding activity constitutively expressed in T cells from RCC patients is composed mostly of the NF-kappa B1 ( p50 ) subunit .
 T cells, kappa B/Rel family proteins, p50, NF-kappa B1 ( p50 ) subunit, antibodies
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:
 T cells, kappa B/Rel family proteins, p50, NF-kappa B1 ( p50 ) subunit, antibodies