Is the smooth ER always attached to the rough ER? (eukaryotic cells)

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Gauss44

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I saw a diagram where it wasn't. Maybe that diagram was drawn wrong?

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Think of it as the same thing. The only thing is that with a RER, there's ribosomes on the endoplasmic reticulum outer surface that faciliate/regulate protein synthesis in/into the ER.

From my understanding they are attached.
 
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