<P> Pseudopeptidoglycan (also known as pseudomurein) is a major cell wall component of some Archaea that differs from bacterial peptidoglycan in chemical structure, but resembles bacterial peptidoglycan in function and physical structure . The basic components are N - acetylglucosamine and N - acetyltalosaminuronic acid (peptidoglycan has N - acetylmuramic acid instead), which are linked by β - 1, 3 - glycosidic bonds . </P> <P> Lysozyme, a host defense mechanism present in human secretions (e.g. saliva and tears), is ineffective against organisms with pseudopeptidoglycan cell walls . Lysozyme can break β - 1, 4 - glycosidic bonds to degrade peptidoglycan; however, pseudopeptidoglycan has β - 1, 3 - glycosidic bonds, rendering lysozyme useless . </P>

This group of prokaryotes has a pseudopeptidoglycan cell wall