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These results point out the involvement of NF-kappa B /Rel family proteins in growth signaling pathways by either regulating proteins involved in the IL-2 signaling or by functionally interfering with the cell cycle progression .
 IL-2, regulating proteins, NF-kappa B /Rel family proteins, NF-kappa B
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, regulating proteins, NF-kappa B /Rel family proteins, NF-kappa B