6834
In all patients a marked decrease in IL-2 -producing cells and a significant increase in well-differentiated Th1 cells that produced IFN-gamma but not IL-2 were evident after priming with anti-CD3 and anti-CD28 .
 Th1 cells, anti-CD3, IFN-gamma, IL-2, IL-2, IL-2 -producing cells, anti-CD28
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:
 Th1 cells, anti-CD3, IFN-gamma, IL-2, IL-2, IL-2 -producing cells, anti-CD28