12602
The p50 and p65 proteins , constituents of the prototypic nuclear factor kappaB , were identified as components of the DNA-protein complexes by anti-peptide antibodies in gel supershift assays .
 ( protein: anti-peptide antibodies, None) , ( protein: nuclear factor kappaB, 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: anti-peptide antibodies, None) , ( protein: nuclear factor kappaB, None) 