Smooth endoplasmic reticulum lacks attached ribosomes. Specialized regions support lipid metabolism and processing of foreign compounds; the endoplasmic reticulum also stores and releases calcium ions. Regional specialization does not split the network into two separate organelles, nor make every smooth region perform every function.[ref]
The Endoplasmic Reticulum. Molecular Biology of the Cell, 4th edition by Bruce Alberts and others; Smooth ER Is Abundant in Some Specialized Cells, Figures 12-38A and 12-38B and calcium-storage paragraphs
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