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Fig. 7. Models of the functional differentiation of TGN in vesicle trafficking
pathways. The TGN does not have a uniform function but is functionally
differentiated into subpopulations that are specialized to transport to the
plasma membranes (yellow), to endosomes (blue), or to prevacuolar compartments
(PVC) (white). VAN3 is located in a subpopulation of the TGN that may be
involved in the transport of auxin signaling modules and/or secreted vascular
formation factors.