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Gene organization around the pcm gene. The genes are rpoS (RNA polymerase, σS subunit, stationary phase), nlpD (may function in cell wall formation), pcm (l-isoaspartyl protein carboxylmethyltransferase; repair of isoaspartyl residues), and surE (required for stationary-phase survival). The multicopy suppressor fragment is delimited by the two arrows, and numbers indicate the location (bases) of its extremities on the E. coli chromosome.
