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Electrophoretic mobility shift assays using protein extracts from EBV- B cells and the IL-2 NF-chi B probe revealed the constitutive generation of chi B complexes in IL-2 -secreting cells consisting mainly of heterodimeric p50/p65 complexes .
 IL-2 -secreting cells, chi B complexes, heterodimeric p50/p65 complexes, EBV- B cells, NF-chi B, IL-2, IL-2, B cells, protein extracts
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:
 IL-2 -secreting cells, chi B complexes, heterodimeric p50/p65 complexes, EBV- B cells, NF-chi B, IL-2, IL-2, B cells, protein extracts