A wall-plus-membrane preparation from a Bacillus licheniformis mutant incorporated radioactivity from a peptidoglycan precursor in which the free amino group of diaminopimelic acid was blocked by 14C-labelled acetyl group. This incorporation was penicillin-sensitive. The enzymically degraded product contained cross-linked dimers, showing that newly synthesized peptidoglycan chains had been cross-linked to the pre-existing cell wall.

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