Smooth endoplasmic reticulum (SER) - Britannica
https://www.britannica.com:443/science/smooth-endoplasmic-reticulum
WebSmooth endoplasmic reticulum, meshwork of fine tubular membrane vesicles, part of a continuous membrane organelle in the cytoplasm of eukaryotic cells, that is involved in lipid synthesis. The smooth endoplasmic reticulum differs from the rough endoplasmic reticulum (RER) by its lack of ribosomes.
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