Term Name:	rough endoplasmic reticulum
Synonyms:	RER, rough ER
Definition:	The rough (or granular) endoplasmic reticulum (ER) has ribosomes adhering to the outer surface; the ribosomes are the site of translation of the mRNA for those proteins which are either to be retained within the cisternae (ER-resident proteins), the proteins of the lysosomes, or the proteins destined for export from the cell. Glycoproteins undergo their initial glycosylation within the cisternae.
Ontology:	GO: Cellular Component [GO:0005791]    QuickGO    AmiGO