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 .
 anti-peptide antibodies, nuclear factor kappaB
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:
 anti-peptide antibodies, nuclear factor kappaB