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. 2013 Mar 22;3(2):270–286. doi: 10.3390/biom3020270

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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The LTQ MS CID-MS/MS spectrum (a) and the Q Exactive MS HCD-MS/MS spectrum (b) of the glycopeptide VASVININPN*TTHSTGSCR (AA#248-266, N* denotes a conversion of Asn to Asp for the N-linked site Asn²⁵⁷) from lysosome-associated membrane glycoprotein 2. Both spectra contain a rich set of structural-fragments. The inset figures show the isotopic profile of the doubly charged precursor ion, and the inset tables show lists of the color-coded fragments matching the expected values for various ions. B_n and Y_n denote the N-terminal and the B-terminal fragments, respectively. The MS/MS fragment nomenclature used is according to Johnson et al. [23].