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Macrorestriction profiles following XbaI cleavage and Pulsed-field gel electrophoresis. Macrorestriction profiles following XbaI cleavage and Pulsed-field gel electrophoresis of calf isolates of VTEC O157:H7. Two distinct pulsotypes are seen. R represents size standards lambda ladder; New England Biolabs. Pulsotype 1: lanes 1-2 and 5-9; Pulsotype 2: lanes 3-4.
