The rough ER, or endoplasmic reticulum, are made of bound ribosomes that are attatched to the outside of the ER. Rough ER is a membrane factory, many membrane bound proteins are synthesized directly into the membrane. The rough ER looks like a lot of folded lines with small bums all over it. The Rough ER contains enzymes that synthesis phospholipids.The ER is continuous with the nuclear envelope and the cisternal space of the ER is continuous with the space between the two membranes of the nuclear envelope.
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