A network of membranes in the cytoplasm of the cell, involved in the transport of materials. There are two types: one studded with ribosomes (rough endoplasmic reticulum) involved in protein synthesis, and the other with a smooth surface (smooth endoplasmic reticulum) involved in the synthesis of fats or lipids.

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1. A network of membranes in the cytoplasm of the cell, involved in the transport of materials. There are two types: one studded with ribosomes (rough endoplasmic reticulum) involved in protein synthesis, and the other with a smooth surface (smooth endoplasmic reticulum) involved in the synthesis of fats or lipids.