The Golgi complex functions to process proteins received from the ER and sort them for delivery to different locations in the cell. It is composed of flattened sacs called cisternae. Proteins enter at the cis face and exit through the trans face after undergoing modifications like glycosylation. The Golgi synthesizes sphingomyelin and other glycolipids and modifies proteins through addition of carbohydrates. Vesicles then transport proteins, lipids, and polysaccharides from the trans-Golgi network to their appropriate destinations, such as the plasma membrane or lysosomes. Vesicle transport and fusion is mediated by coat proteins and SNARE complexes.