Why might it be advantageous to add a preassembled block of 14 sugar residues to a protein

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Why might it be advantageous to add a preassembled block of 14 sugar residues to a protein in the ER, rather than building the sugar chains step-by-step on the surface  the protein by the sequential addition of sugars by individual enzymes?

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Essential Cell Biology

ISBN: 9780393680362

5th Edition

Authors: Bruce Alberts, Karen Hopkin, Alexander Johnson, David Morgan, Martin Raff, Keith Roberts, Peter Walter

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