Peptidoglycan is the cell wall of prokaryotes. The cell walls of most bacteria are formed primarily from peptidoglycan. Peptidoglycan, also known as mucilage complex, cytoplasm. A multilayered reticulated macromolecular structure consisting of acetylglucosamine, acetylcytidylic acid polymerized with four to five amino acid short peptides. From each N-acetylcytidylic acid leads an oligopeptide chain, and adjacent polysaccharide chain on the N-acetylcytidylic acid, so that the two parallel sugar chain transverse to each other to form a network, so that a layer of peptidoglycan is formed. Peptidoglycan can stimulate mononuclear phagocytes and endothelial cells to release immunoregulatory substances such as interleukin (1L-1, 1L-6), interferon alpha and so on to enhance the body’s immunity.