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Types of polymorphic restriction patterns by B1 PCR and B3 PCR used for toxinotyping. For B1 five patterns (lanes 1 to 5, respectively) of HincII (Hc) and AccI (A) restriction patterns are differentiated, and for B3 four different HindIII (H) and RsaI (R) patterns (lanes 1 to 4, respectively) are obtained. Lane M, 100-bp marker.
