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Position of the erm (ermF-ermAM) cassette in P. gingivalis mutants. The upper line indicates the position of the rag operon and PG0183 in wild-type P. gingivalis W50 (8). Below are four mutant constructs in which the erm cassette is either inserted into, or replaces a section of, the corresponding genes of P. gingivalis W50 or WPH35. The positions of relevant restriction sites are shown.
