6520
C5a , a potent peptide chemoattractant , stimulates interleukin-8 ( IL-8 ) secretion from peripheral blood mononuclear cells ( PBMC ).
 mononuclear cells, peripheral blood mononuclear cells, interleukin-8, IL-8, 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:
 mononuclear cells, peripheral blood mononuclear cells, interleukin-8, IL-8, PBMC