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During the solution structure determination of the Escherichia coli quorum-sensing protein SdiA in the presence of N-octanoyl-l-homoserine lactone (HSL), NMR signals were detected in 13 C-filter– 13 C-filter spectra for the bound HSL molecule. An additional set of coupled signals, independent of those of HSL, were also detected, indicating the presence of another unlabeled molecule,...
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