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Where are mannose groups removed from proteins in the Golgi apparatus?

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Diagram of the Golgi apparatus showing its stacked, curved membranes with labeled parts including cisternae, cis face, trans face, lumen, and various vesicles involved in cellular transport and secretion. — Golgi apparatus A membrane-bound organelle of eukaryotic cells, the Golgi apparatus is made up of a series of flattened, stacked pouches called cisternae that function as a series of compartments that progressively refine and direct cellular products to their proper destinations. .

Within the Golgi apparatus, the removal of mannose moieties from proteins occurs primarily in the cis and medial cisternae.1

These compartments are part of the organelle's structurally polarized system, where specific enzyme-driven modifications take place as proteins and lipids progress toward the trans face for final sorting and packaging.1