6799
Peptidoglycan ( PGN ), the major cell wall component of Gram-positive bacteria , induces secretion of cytokines in macrophages through CD14 , the pattern recognition receptor that binds lipopolysaccharide and other microbial products .
 cytokines, CD14, macrophages
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:
 cytokines, CD14, macrophages