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. Author manuscript; available in PMC: 2014 Sep 3.

Published in final edited form as: J Mass Spectrom. 2010 Jan;45(1):97–103. doi: 10.1002/jms.1697

Identification of m/z 3653. (A) Tandem mass spectrum obtained from a MALDI–LTQ ion trap instrument of m/z 3653. Fragment ions confirm the identity as secretoneurin. ^*, loss of water; †, loss of ammonia; , internal fragment representing secretoneurin residues 11–26; , internal fragment representing secretoneurin residues 11–27. (B) Annotated rat secretoneurin sequence showing extensive sequence coverage of the neuropeptide in the tandem mass spectrum.

Inline graphic — Identification of m/z 3653. (A) Tandem mass spectrum obtained from a MALDI–LTQ ion trap instrument of m/z 3653. Fragment ions confirm the identity as secretoneurin. ^*, loss of water; †, loss of ammonia; , internal fragment representing secretoneurin residues 11–26; , internal fragment representing secretoneurin residues 11–27. (B) Annotated rat secretoneurin sequence showing extensive sequence coverage of the neuropeptide in the tandem mass spectrum.