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What is a cell wall?

What is a cell wall? Here are some definitions.

Noun
  1. (cytology) A thick, fairly rigid, layer formed around individual cells of bacteria, Archaea, fungi, plants, and algae (but not animals and other protists which generally have cell membranes without cell walls). The cell wall is external to the cell membrane and serves a structural function helping the cell maintain its shape and protecting the cell from damage.
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Examples
The outermost layer of the cell wall is composed of diverse proteins bearing polysaccharide side chains composed of mannose.
Only mononuclear protoplasts were capable of complete cell wall regeneration and mitotic division.
Proteins involved with cell wall biogenesis, which display low connectivity levels, have a clear trend of later appearance.
Fungal cells maintain a very high turgor pressure, so the integrity of the cell wall is a critical matter.
Roma might reflect a more or less continuous biosynthesis of new cell wall material.
Ribitol teichoic acid is an important component of Staphylococcus aureus cell wall.

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