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Agarose gel showing detection of the ubb gene by PCR in isolates of B. fragilis from different geographical locations. Origins of B. fragilis samples are: PtA, peritoneal abscess; A, abscess; NpA, neoplasm abscess; PaA, perianal abscess; AbA, abdominal abscess; UN, unknown origin. The position of the ubb amplicon is shown adjacent to the image, with DNA molecular size markers in the first and last lanes. Note the absence of ubb in B. ovatus and some B. fragilis isolates.
