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Electrophoresis profiles of PCR-amplified gene 4 cDNA of strain PA169 (lanes 2 and 3) and of fecal isolate PA-5/89 (lanes 4 and 5), before and after, respectively, digestion with AluI, visualized by ethidium bromide staining of the gel. Lane 1, DNA molecular weight marker VIII (Boehringer Mannheim).
