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Isotopically edited peptides S,S-Tet-AKAC10*/A11*, S,S-Tet-AKAA5*/A6* and S,S-Tet-AKAA17*/A18* were synthesized to resolve the amide-I stretching mode from the remaining backbone stretching modes. The position of the 13C=18O labeled amides in the synthetic peptides is shown in blue circles.
