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Southern hybridization analysis of PCR-amplified PorA gene probed with the 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 14: N20/95, N1230/95, N1098/93, N7/94, N447/96, N1206/95, N150/88, N171/96, N163/90, N43/90, N288/91, N292/91, N337/89 (negative control), and N44/89 (positive control), respectively.
