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Two sets of synthetic oligonucleotide primers were used in a polymerase chain reaction adaptation to distinguish the closely related genes for type 2 verotoxin (VT2 or Shiga-like toxin [SLT-II]) and the verotoxin associated with porcine edema disease (VTe or SLT-II variant [SLT-IIv]) in Escherichia coli.
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Johnson et al. (1990) studied this question.
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