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The endoplasmic reticulum (ER) is a part of a transportation system of the eukaryotic cell, and has many other important functions such as protein folding. The word endoplasmic means "within the cytoplasm", and reticulum is Latin for "little net". It is a type of organelle made up of two subunits - rough endoplasmic reticulum (RER), and smooth endoplasmic reticulum (SER). The endoplasmic

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