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Inhibition of cytokine production by PBMC was observed also when other inducers were used ( staphylococci , silica , zymosan ).
 cytokine, PBMC
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:
 cytokine, PBMC