Editing Extracellular matrix (section)

==In plants==
[[Plant]] cells are [[Tessellation|tessellated]] to form [[Tissue (biology)|tissue]]s. The [[cell wall]] is the relatively rigid structure surrounding the [[plant cell]]. The cell wall provides lateral strength to resist [[osmotic]] [[turgor pressure]], but it is flexible enough to allow cell growth when needed; it also serves as a medium for intercellular communication. The cell wall comprises multiple laminate layers of [[cellulose]] [[microfibril]]s embedded in a [[Matrix (biology)|matrix]] of [[glycoproteins]], including [[hemicellulose]], [[pectin]], and [[extensin]]. The components of the glycoprotein matrix help cell walls of adjacent plant cells to bind to each other. The [[selective permeability]] of the cell wall is chiefly governed by pectins in the glycoprotein matrix. [[Plasmodesmata]] (''singular'': plasmodesma) are pores that traverse the cell walls of adjacent plant cells. These channels are tightly regulated and selectively allow molecules of specific sizes to pass between cells.<ref name=MCB/>