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The interaction of purified octamer transcription factors 1 and 2 ( OTF1 and OTF2 ) with the MOPC 141 promoter was studied by using electrophoretic mobility shift assays and DNase I footprinting .
 protein: DNase I; DNA: MOPC 141 promoter; protein: transcription factors; protein: octamer transcription factors; protein: OTF2; protein: OTF1
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: DNase I; DNA: MOPC 141 promoter; protein: transcription factors; protein: octamer transcription factors; protein: OTF2; protein: OTF1