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In this report, we show that in human peripheral blood T cells , CD28 -mediated signal transduction involves the rel family proteins -- c-Rel , p50 , and p65 .
 CD28, p50, human peripheral blood T cells, rel family proteins, c-Rel, p65
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:
 CD28, p50, human peripheral blood T cells, rel family proteins, c-Rel, p65