13038
The addition of anti-CD28 mAb to anti-CD3-stimulated cells markedly increased IL-2 production in both cell types, but levels of IL-2 in neonatal T cells remained clearly lower than those of adult T cells (respective mean values: 385 +/- 109 pg/ml and 4494 +/- 1199 pg/ml).
 ( cell type: neonatal T cells, None) , ( cell type: adult T cells, None) , ( protein: anti-CD28 mAb, None) , ( protein: IL-2, None) , ( cell line: anti-CD3-stimulated cells, None) , ( protein: IL-2, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: neonatal T cells, None) , ( cell type: adult T cells, None) , ( protein: anti-CD28 mAb, None) , ( protein: IL-2, None) , ( cell line: anti-CD3-stimulated cells, None) , ( protein: IL-2, None) 