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Ribosomes are tiny protein factories within a cell. Ribosomes are most abundant in protein producing cells, such as those in the brain and pancreas. Some of the proteins are for use within the cell; these are produced by free-floating ribosomes and by those attached to the rough endoplasmic reticulum (ER). Some of the proteins produced by ribosomes on the ER will be sent to other cells. Ribosomes are made up of about 60% RNA and 40% protein. Ribosomes account for about 90% of the RNA within the cell.
Golgi bodies (also called the golgi apparatus or golgi complex) package the proteins produced by ER ribosomes with lipids and surround them with a membrane. These packets are then ready to be exported from the cell.
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