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Golgi apparatus. An organelle, named after the Italian histologist Camillo Golgi, found in all eukaryotic cells but absent from prokaryotes such as bacteria. It consists of flattened membrane-bounded compartments known as cisternae. In most cells, the Golgi cisternae are organized into stacks.
The Golgi apparatus has a structure that is made up of cisternae, which are flattened stacks of membrane usually found in a series of five to eight, or until they fill up the cytoplasm. These cisternae help proteins and cytoplasmic components biochemically react and travel between different parts of the Cell.