Vesicle trafficking moves membrane and cargo between cellular compartments through transport carriers. Cargo selection and budding are followed by targeting, vesicle docking and membrane fusion. A carrier from the endoplasmic reticulum can deliver newly synthesized proteins to the Golgi apparatus, while other carriers retrieve resident components. Directional transport maintains distinct compartments despite continual membrane exchange; it depends on selective recognition rather than random mixing. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapter 13, Intracellular Vesicular Traffic
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