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The N-glycan encoding system [4].
| 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 |
