Primary cell wall

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Definition

noun

A thin, flexible and extensible layer of the cell wall composed of cellulose, pectin and hemicellulose.


Supplement

The primary cell wall is the part or layer of cell wall in which cell growth is permitted. Compared to secondary cell wall, this layer contains more pectin and lignin is absent until a secondary wall has formed on top of it.


Compare: secondary cell wall, middle lamella.
See also: cell wall.

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