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What does the Golgi apparatus do?

The Golgi apparatus is an organelle that modifies, sorts, and packages proteins and lipids for transport within or out of the cell. After proteins are produced in the endoplasmic reticulum, they are sent to the Golgi, where they may be chemically modified (for example, by adding carbohydrate groups). The Golgi then directs these molecules to their appropriate destinations, such as the cell membrane, other organelles, or for secretion outside the cell.