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There are two types of endoplasmic reticulum; they are the rough endoplasmic reticulum and the smooth endoplasmic reticulum.  The rough endoplasmic reticulum’s possess the ribosomes on their cytosolic surface. The presence of the ribosome makes it surface a rough appear so known as the rough endoplasmic reticulum. These ribosomes secrete proteins which are passed into the lumen of endoplasmic reticulum. These proteins are then passed to the smooth endoplasmic reticulum where it gets added with sugar molecules forming the glycoprotein. These glycoproteins then bud of from the smooth endoplasmic reticulum.

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