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PFGE restriction patterns of chromosomal DNA from S. canis isolated from seven milk samples (lanes 1 to 7, respectively) after digestion with endonuclease SmaI. Lanes M (left and right), a 50- to 1,000-kb ladder (Lambda Ladder PFG Marker; BioLabs, Schwalbach, Germany) and a 0.1- to 200-kb ladder (Low Range PFG Marker; BioLabs), respectively, which served as size markers.
