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Definition

noun

(cell biology)

The endoplasmic reticulum that is studded with ribosomal granules.

Supplement

The ribosomes that give the endoplasmic reticulum a 'rough' appearance are not always bound with the ER. They bind to it when it starts to synthesize membrane-bound proteins destined for sorting.

Synonym: rough endoplasmic reticulum.
Compare: agranular endoplasmic reticulum.
See also: endoplasmic reticulum.