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Experiments are proposed for the measurement of the vicinal coupling constants between β-carbons and either amide protons of the same or carbonyl carbons of the preceding amino acid residue in 13C/15N-labeled proteins. Both couplings depend on the backbone torsional angle φ. The three-dimensional pulse sequences give rise to E.COSY-like multiplet patterns in which heteronuclear one-bond couplings...
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