Retrieving "Pseudopeptidoglycan" from the archives

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1. Archaea

   Linked via "pseudopeptidoglycan"

   Cell Wall and Membrane Lipids
   The cell envelope of Archaea is highly variable. While some species possess cell walls composed of pseudopeptidoglycan (pseudomurein), structurally similar to bacterial peptidoglycan but lacking $N$-acetylmuramic acid, many others utilize S-layers (surface-layers) composed of paracrystalline protein or glycoprotein subunits.
   A defining feature of Archaea is the composition of their cellular membranes. Unlike Bacteria and Eukarya, which utilize ester-linked phospholipids derive…