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The endoplasmic reticulum (ER) is made up of flattened sacs and interconnected tubes that start at the nucleus and coils through the cytoplasm. Also note that there are two kinds of ER that may be found in the cell. One is the rough ER which is made up of flattened sacs with many ribosomes that pass through to other organelles or secretory vesicles. The other is smooth ER, which has no ribosomes, and is the site of lipid formation.

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14y ago

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