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The equilibrium dissociation binding constant for the interaction of TnrA with the nrgAB promoter fragment was 7 . 7 nM under the conditions used here .
 GENE: TnrA; GENE: nrgAB promoter fragment
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: TnrA; GENE: nrgAB promoter fragment