12304
Both CD2 and CD3 cross-linking increased binding of nuclear proteins to a radiolabelled CRE oligonucleotide probe in electrophoretic mobility shift assays suggesting that lymphocyte activation enhances binding independently of phosphorylation of CREB at serine 133 .
 ( protein: nuclear proteins, None) , ( protein: CD3, None) , ( protein: CD2, None) , ( protein: CREB, 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: nuclear proteins, None) , ( protein: CD3, None) , ( protein: CD2, None) , ( protein: CREB, None) 