endoplasmic reticulum

id: GO:0005783
name: endoplasmic reticulum
namespace: cellular_component
type: go
obsolete: False

Description: The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached).

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