14677
We now report that EC costimulation causes increased levels of IL-2 mRNA as a result of increased IL-2 transcription in PBL .
 PBL, IL-2, IL-2 mRNA, EC
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:
 PBL, IL-2, IL-2 mRNA, EC