13851
Mononuclear phagocytes play an important role in atherosclerosis and its sequela plaque rupture in part by their secretion of matrix metalloproteinases ( MMPs ), including MMP-9 .
 MMPs, Mononuclear phagocytes, matrix metalloproteinases, MMP-9
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:
 MMPs, Mononuclear phagocytes, matrix metalloproteinases, MMP-9