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1H-NMR spectra of lambda-OR3 17mer in the complex with lambda-cro has been analysed and the change in its conformation on the complexation has been deduced. The changed conformation is retained until the duplex melts above 55 degrees C. Increase in heat stability of the cro dimer was observed. The result was compared with those of other DNA fragments phi 80-OR2 19 mer and the CRP binding site 22mer mixed with lambda-cro.
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