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* Cell wall: the outermost part of archaea, it is arranged around the cell and protects the cell contents. It does not contain peptidoglycan, which makes them naturally resistant to lysozyme. The most common wall is a paracrystalline surface layer formed by proteins or glycoproteins of hexagonal symmetry. An exception is the genus Thermoplasma which lacks a wall, a deficiency that is filled by the development of a cell membrane with a unique chemical structure,

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