to establish whether muramyl dipeptide or glycopeptides structurally related to it are formed as a result of macrophage processing of peptidoglycan , bacillus subtilis cell walls radiolabeled in the muramic acid , glucosamine , and alanine residues of the constituent peptidoglycan were incubated in the presence of the cultured macrophage-like cell line raw264 , and the glycopeptides which released into the medium were fractionated and analyzed .
C0001060
muramyl dipeptide
C0017953
glycopeptides