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PCR amplicons of the class I integron(s) from DT104 strains with two different antimicrobial resistance phenotypes: AmCmStSuTe strains isolated from fecal samples (lanes 1 and 3) and StSu strains isolated from environmental samples (drag swabs) (lanes 2 and 4). Product sizes of approximately 1.0 and 1.2 kb are shown.
