Components of this substance are the primary molecules recognized by NOD1, NOD2 and PGRPs. The mecA gene from the SCCmec cassette codes for an enzyme that acts on this substance called PBP2a. This primary substrate of lysozyme’s precursors may have D-lactate (15[1])integrated in VRE to provide (*) vancomycin resistance. D-alanine (-5[1])residues in this substance are cleaved by transpeptidases known as penicillin binding proteins (-5[1])before cross-linking. This substance, which consists of alternating NAG and NAM, helps retain crystal violet in a common (10[1])staining (-5[1])procedure. Gram positive (10[1])organisms (10[1]-5[1])have thick layers of, for 10 points, what polysaccharide found in bacterial cell walls? (10[1])■END■ (10[2])