6189
TNFalpha is a rapid activator of IL-8 gene expression by U937 , producing a 50-fold induction of mRNA within 1 hour of treatment.
 U937, IL-8 gene, mRNA, TNFalpha, IL-8
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:
 U937, IL-8 gene, mRNA, TNFalpha, IL-8