The proteins that are to be secreted from the cells are produced in the ribosomes on RER. They are protein factories.
Ribosomes and protein synthesis
Ribosomes are protein factories where the process of translation from mRNA to protein takes place.
Ribosomes can be found free in the cytoplasm or attached to the surface of the rough endoplasmic reticulum (RER).
The rough endoplasmic reticulum is a series of connected flattened sacs found in the cytoplasm of eukaryotic cells.
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