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PFGE of 10 E. coli isolates from 2004 and E. coli KL-16 (serving as the control strain) after restriction with XbaI. Lane 1, phage lambda ladder (size marks in Kb); lanes 2 and 12, E. coli KL-16; lanes 3 to 11, E. coli isolates from 2004 (in lane 4, one of the five PFGE-identical isolates).
