Archaea's cell wall is a protective structure lacking peptidoglycan and often featuring a proteinaceous S-layer.
Archaea's cell wall is a semi-rigid structure that provides protection from the environment and internal cellular pressure. Unlike bacteria, archaea lack peptidoglycan in their cell walls and exhibit a variety of wall types, with some lacking a cell wall altogether. A significant feature of some archaea cell walls is a proteinaceous S-layer, which can be made of protein or glycoprotein.
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