Endoplasmic Reticulum

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Rough endoplasmic reticulum is directly involved in which function?

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1. **Distinction**: The Endoplasmic Reticulum (ER) is divided into Rough ($RER$) and Smooth ($SER$).
2. **Rough ER ($RER$)**: It is 'rough' because it is studded with **ribosomes** on its outer surface.
3. **Function**: These ribosomes are the sites for the **translation (synthesis) of proteins** that are destined for secretion out of the cell, for incorporation into the cell membrane, or for lysosomal enzymes.
4. **Smooth ER ($SER$)**: It lacks ribosomes and is primarily involved in **lipid and steroid synthesis**, as well as the **detoxification** of drugs and poisons.

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Endoplasmic Reticulum

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