Editing Cell wall (section)

===Layers===

[[File:Plant Cell Wall.png|thumb|Cell wall in multicellular plants – its different layers and their placement with respect to protoplasm (highly diagrammatic)]]

[[File:Plant cell wall diagram-en.svg|thumb|right|Molecular structure of the primary cell wall in plants]]
Up to three strata or layers may be found in plant cell walls:<ref>{{cite book | first1 = Bob B | last1 = Buchanan | first2 = Wilhelm | last2 = Gruissem | first3 = Russell L | last3 = Jones | name-list-style = vanc | title = Biochemistry & molecular biology of plants | edition = 1st | publisher = American society of plant physiology | year = 2000 | isbn = 978-0-943088-39-6 | url-access = registration | url = https://archive.org/details/biochemistrymole00buch }}</ref>

*The '''primary cell wall''', generally a thin, flexible and extensible layer formed while the cell is growing.
*The '''[[secondary cell wall]]''', a thick layer formed inside the primary cell wall after the cell is fully grown. It is not found in all cell types. Some cells, such as the conducting cells in [[xylem]], possess a secondary wall containing [[lignin]], which strengthens and waterproofs the wall.
*The '''[[middle lamella]]''', a layer rich in [[pectin]]s. This outermost layer forms the interface between adjacent plant cells and glues them together.