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. Author manuscript; available in PMC: 2010 Sep 16.

Published in final edited form as: J Proteome Res. 2009 Apr;8(4):1672–1681. doi: 10.1021/pr800795r

(A) The MS/MS spectrum of the [M+2H]²⁺ ion at m/z 1281.8 from the tryptic peptide GTVVVPTLDSVLYDNQEFPDPEK. For MRM experiments the fragmentation channel m/z 1281.81054.3 i.e. [M+2H]²⁺ y₁₈²⁺ was monitored. (B) The MS/MS spectrum of the [M+2H]²⁺ ion at m/z 1285.3 from the stable-isotope labelled peptide GTVVVPTL*DSVLYDNQEFPDPEK, where L* corresponds to leucine labelled with ¹³C₆¹⁵N. For MRM experiments the fragmentation channel m/z 1285.31057.6 i.e. [M+2H]²⁺ y₁₈²⁺ was monitored. Data acquired on the LCQ^duo.

Inline graphic — (A) The MS/MS spectrum of the [M+2H]²⁺ ion at m/z 1281.8 from the tryptic peptide GTVVVPTLDSVLYDNQEFPDPEK. For MRM experiments the fragmentation channel m/z 1281.81054.3 i.e. [M+2H]²⁺ y₁₈²⁺ was monitored. (B) The MS/MS spectrum of the [M+2H]²⁺ ion at m/z 1285.3 from the stable-isotope labelled peptide GTVVVPTL*DSVLYDNQEFPDPEK, where L* corresponds to leucine labelled with ¹³C₆¹⁵N. For MRM experiments the fragmentation channel m/z 1285.31057.6 i.e. [M+2H]²⁺ y₁₈²⁺ was monitored. Data acquired on the LCQ^duo.