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Distribution of the msuD gene. PCR was done with genomic DNA of the indicated species, using primers orfM500 and orfM970rev, and the PCR products were separated on a 2% agarose gel. Growth of the various species in succinate-minimal medium with taurine or methane- or pentanesulfonate (Me/Pn sulfonate) is indicated. a, S. maltophilia will grow only with cysteine or methionine as a sulfur source.
