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We therefore investigated whether NF-kappaB /Rel proteins are expressed in human neutrophils , as well as their fate on cell activation.
 NF-kappaB /Rel proteins, neutrophils, human neutrophils, NF-kappaB
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:
 NF-kappaB /Rel proteins, neutrophils, human neutrophils, NF-kappaB