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The Golgi Apparatus, also known as the Golgi complex or Golgi body, is a cellular organelle found in eukaryotic cells. It plays a crucial role in the processing and sorting of proteins and lipids within the cell. After proteins are synthesized by ribosomes in the endoplasmic reticulum (another organelle), they are transported to the Golgi Apparatus. Here, they undergo modifications such as glycosylation and then are packaged into vesicles for transportation to their final destinations within the cell or for secretion from the cell. The Golgi Apparatus is typically comprised of a series of flattened, membrane-bound sacs called cisternae that are arranged in a stack-like structure. It is often located near the nucleus and endoplasmic reticulum. In summary, the Golgi Apparatus is an essential organelle for protein processing and transport within eukaryotic cells, and it fits into the hierarchy of Cellular Biology Organelles as a specialized structure with a unique function in the cell's internal organization and communication.