In the Golgi apparatus, N-glycans are further processed by class I mannosidase which can trim high mannose N-glycans (Man(8-9)GlcNAc(2)) down to Man(5)GlcNAc(2). In D. melanogaster, N-glycan processing often ends at this stage and the glycoproteins are delivered to organelles, the plasma membrane or secreted. Alternatively, Man(5)GlcNAc(2) can be further processed to GlcNAc(1)Man(3)GlcNAc(2) which constitutes a branch point intermediate for the production of complex and hybrid N-glycans. However, the removal of the terminal GlcNAc by N-acetylglucosaminidase fdl prevents any further elongation, resulting in the export of paucimannose N-glycan linked proteins. (Adapted from FBrf0235108 and FBrf0224862.)