Table 1 Unique one letter codes in Mascot readable format, their definitions and residue masses of the four basic sugar types.

From: Large-scale intact glycopeptide identification by Mascot database search

Glycan residues

Glycan type

Residue mass

One letter code

Gal, Man

Hexose

162.0528

J

GlcNAc, GalNAc

N-acetylhexoseamine

203.0794

O

Neu5Ac

Sialic acid

291.0954

U

Fuc

Deoxyhexose

146.0579

Variable modification on O

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