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Cysteines in the N-terminal domain of IGFBP-5 are located in highly intertwined peptides. CID-MS2 of precursor ion, m/z 1010.4 (+6), demonstrates that P1-P2-P3-P5, containing 10 cysteine residues, are linked by disulfide bonds. Ions marked with * and ^ are from P1 and P2, respectively. Other ions are from P3.
