Nucleolus
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The nucleolus is the largest structure in the nucleus of eukaryotic cells. It is best known as the site of ribosome biogenesis. The nucleolus also participates in the formation of signal recognition p
Electron micrograph of part of a HeLa cell. The image is a screen capture from this movie, which shows a Z-stack of the cell.
Endoplasmic reticulum
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The endoplasmic reticulum is a part of a transportation system of the eukaryotic cell, and has many other important functions such as protein folding. The word endoplasmic means "within the cytoplasm"
Nucleolus
…of the complete ribosome. These are exported through the nuclear pore complexes to the cytoplasm, where they remain free or become associated with the endoplasmic reticulum, forming the rough endoplasmic reticulum (RER). In human endometrial cells, a network of nucleolar channels is sometimes formed. The origin and function…
Ca2+-antagonized transport into the endoplasmic reticulum (CaATiER) model