7401
Lipopolysaccharide ( LPS ) is a potent stimulator of monocytes and macrophages , causing secretion of tumor necrosis factor alpha ( TNF-alpha ) and other inflammatory mediators .
 TNF-alpha, tumor necrosis factor alpha, macrophages, monocytes
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:
 TNF-alpha, tumor necrosis factor alpha, macrophages, monocytes