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Using purified recombinant p50 , p65 , and c-Rel proteins , optimal DNA-binding motifs were selected from a pool of random oligonucleotides .
 protein: p65; protein: c-Rel proteins; protein: p50; DNA: optimal DNA-binding motifs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: p65; protein: c-Rel proteins; protein: p50; DNA: optimal DNA-binding motifs