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Southern hybridization analysis of PCR-amplified PorA gene probed with 32P-labeled coding sequences for VR1 (A) and VR2 (B) of strain N44/89 and with the 32P-labeled PorA gene of strain N44/89 (C). Strains in lanes 1 to 11: N577/89, N585/94, N405/96, N493/96, N539/96, N594/96, N654/96, N433/95, N738/96, N44/89 (positive control), and N337/89 (negative control), respectively.
