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. Author manuscript; available in PMC: 2013 Jan 18.
Published in final edited form as: Front Biosci (Schol Ed). 2011 Jun 1;3:1520–1532. doi: 10.2741/242

Figure 4.

Figure 4

The assembly line of glyco-enzymes. Glycans are assembled in a stepwise manner catalyzed by glycosyltransferases, instead of from DNA or RNA templates. In different cells (here represented as X and Y), different glycan structures are formed by different glycosyltransferases (T1-T4 in cell X, and T5-T8 in cell Y). The presence of specific glycan structures cannot be predicted by gene expressions, because each glycan can be converted to another structure by downstream glyco-enzyme modification.