d,br>(d) : Smooth endoplasmic reticulum $(SER) $ is a system of smooth membranes ($i.e.$, membranes not having ribosomes) within the cytoplasm of plant and animal cells. It forms a link between the cell and nuclear membranes. It is the site of important metabolic reactions, including phospholipid and fatty acid synthesis. In animal cells lipidlike steroidal hormones are also synthesized.
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