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PFGE profiles of E. coli isolates from retail chicken products. Lane numbers are shown below image. XbaI PFGE profiles reveal identity between Nal-susceptible (S) isolates 412, 436, and 458 (lanes 2, 4, and 6) and Nal-resistant (R) isolate 427, 453, and 461 (lanes 3, 5, and 7). Lanes 1 and 8, reference E. coli O157:H7 strain G5244.
