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How does the cellular location of protein glycosylation in the ER and Golgi relate to the localization pf carbohydrates on in
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Most plasma membrane and secretory proteins contain one or more carbohydrate chains. More addition and subsequent processing of these carbohydrate chains (ie glycosylation) may result principal chemical modification to most such proteins.Some glycosylation reaction takesplace in the ER,Others in the lumen of the  Cis or Trance face of the golgi cisternae.Thus the presence of certain carbohydrate residues on proteins provide a good markers for their movement from ER and through the golgi cisternae.

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