eukrüootsetes rakkudes olev labürinditaoline struktuur, mis on tsütoplasmast eraldatud ühekihilise membraaniga
The endoplasmic reticulum (ER) is a type of organelle in eukaryotic cells that forms an interconnected network of flattened, membrane-enclosed sacs. There are two types of endoplasmic reticulum: rough and smooth. The outer (cytosolic) face of the rough endoplasmic reticulum is studded with ribosomes that are the sites of protein synthesis. The smooth endoplasmic reticulum lacks ribosomes and functions in lipid manufacture and metabolism, the production of steroid hormones, and detoxification.
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Tuumaümbrise välimine membraan läheb sujuvalt üle tsütoplasmavõrgustiku membraaniks. Ribosoomidega seotud karedapinnalise tsütoplasmavõrgustiku kaasabil toimub sekreteeritavate ja membraanis asuvate valkude süntees ja töötlemine. Siledapinnalise tsütoplasmavõrgustiku membraanis, mille pinnal ei ole ribosoome, toimub lipiidide süntees.
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