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Comparison of the primary structure of the murM protein in penicillin-susceptible and -resistant pneumococcal strains. The murM genes were sequenced from the penicillin-susceptible laboratory strain R36A, the penicillin-resistant South African strain 8249, and its transformant-derivative Pen6. Parts of the murM of the resistant strain showing divergence from the corresponding sequences in strain R36A are shown in black.
