6402
In addition, we evaluated the effect of dexamethasone on phorbolmyristate-acetate -stimulated IL-1 receptor antagonist secretion by the human monocytic cell line U937 .
 human monocytic cell line U937, IL-1, IL-1 receptor
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:
 human monocytic cell line U937, IL-1, IL-1 receptor