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Validation of DiLeu labels for neuropeptidomic studies. Quantitation of reporter ions for (a) peptide standard SGKWSNLRGAWamide (m/z 1260.66) prepared at ratio 1:1:1:1 followed by DiLeu labeling and subjected to tandem MS fragmentation and (b) peptide standard RPKPQQFFGLMamide (m/z 1347.74) prepared at ratio 10:5:2:1 followed by DiLeu labeling and subjected to tandem MS.
