Page "Cell wall" Paragraph 1

The material in the cell wall varies between species, and can also differ depending on cell type and developmental stage.

In bacteria, peptidoglycan forms the cell wall.

Archaean cell walls have various compositions, and may be formed of glycoprotein S-layers, pseudopeptidoglycan, or polysaccharides.

Fungi possess cell walls made of the glucosamine polymer chitin, and algae typically possess walls made of glycoproteins and polysaccharides.

Unusually, diatoms have a cell wall composed of biogenic silica.

Often, other accessory molecules are found anchored to the cell wall.