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murein
This term is a specialized biochemical designation used almost exclusively within microbiology and biochemistry. It is synonymous with peptidoglycan, though "peptidoglycan" is more frequently encountered in contemporary academic literature to describe the polymer's composition of peptides and glycans.
As a chemical substance referring to a specific molecular structure, it is treated as an uncountable mass noun. It describes the material composition of the bacterial cell wall rather than individual discrete units.