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Table 1 The N-glycan encoding system [4].

From: GlycoForm and Glycologue: two software applications for the rapid construction and display of N-glycans from mammalian sources

Digit Allowed values Meaning
1 3-6 Number of mannose residues
2 0 or 1 Core fucose
3 0 or 1 Bisecting GlcNAc
4 0-6 Extension level of branch 1
5 0-6 Extension level of branch 2
6 0-6 Extension level of branch 3
7 0-6 Extension level of branch 4
8 0-8 Number of galactose residues
9 0-4 Number of N-acetylneuraminic acid residues