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HPLC profiles of the stem peptide components of the peptidoglycan from the penicillin- susceptible strain R36A and the penicillin-resistant strain Pen6 and their murMN-inactivated mutant derivatives. Cell wall peptidoglycans were prepared from strains R36A, Pen6, and their mutant derivatives with insertionally inactivated murMN, and the stem peptide composition was determined by HPLC analysis as described in Experimental Procedures.
