Endoplasmic Reticulum, Rough

**Definition:** A type of endoplasmic reticulum (ER) where polyribosomes are present on the cytoplasmic surfaces of the ER membranes. This form of ER is prominent in cells specialized for protein secretion and its principal function is to segregate proteins destined for export or intracellular utilization.

**Tree numbers:** - A11.284.430.214.190.875.248.300 - A11.284.430.214.190.875.811.740.300

**Synonyms:** - Endoplasmic Reticulum, Granular - Granular Endoplasmic Reticulum - Rough Endoplasmic Reticulum - Rough ER