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Schematic model of GDP-bound Rab27a function in pancreatic β-cells. Endocytosis is a complex process that involves cargo sorting, membrane invagination, vesicle scission and vesicle targeting. GDP-bound Rab27a modulates F-actin assembly and regulates the retrograde transport of the internalized secretory membrane, at the stage after scission from the plasma membrane. Scission is indicated by the dynamin step.
