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A set of three experiments is described which correlate aromatic resonances of histidine and tryptophan residues with amide resonances in 13C/15N-labelled proteins. Provided that backbone 1H and 15N positions of the sequentially following residues are known, this results in sequence-specific assignment of histidine 1Hδ2/13Cδ2 and 1Hε1/13Cε1 as well as tryptophan 1Hδ1/13Cδ1, 1Hζ2/13Cζ 2, 1Hη2/13Cη2...
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