The bacterial cell wall.
D000596:Amino Acids / Q000378:metabolism; D001419:Bacteria / Q000166:cytology*; D050260:Carbohydrate Metabolism; D002473:Cell Wall; D006651:Histocytochemistry; D008854:Microscopy, Electron; D009113:Muramidase / Q000494:pharmacology; D010406:Penicillins / Q000494:pharmacology
D000596:Amino Acids; D010406:Penicillins; D009113:Muramidase