13803
Electrophoretic mobility-shift assays revealed that recombinant IL-2 increased NF-kappaB binding activity in nuclear extracts of the leukemia cells , and Northern blot analysis showed that IL-2 increased the abundance of mRNAs encoding the NF-kappaB components c-Rel and KBF1 in these cells.
 ( protein: NF-kappaB, None) , ( cell type: leukemia cells, None) , ( protein: c-Rel, None) , ( protein: NF-kappaB, None) , ( protein: KBF1, None) , ( protein: IL-2, 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:
 ( protein: NF-kappaB, None) , ( cell type: leukemia cells, None) , ( protein: c-Rel, None) , ( protein: NF-kappaB, None) , ( protein: KBF1, None) , ( protein: IL-2, None) , ( protein: IL-2, None) 