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Agarose gel electrophoresis of PCR products amplified with primers for the 310-bp sequence of the B. burgdorferi ospA gene (primers 149 and 459). Lane 1, DNA size standards; lane 2, B. burgdorferi genomic DNA (positive control); lane 3, sterile distilled water (negative control); lane 4, the B. burgdorferi B-31 reference strain; lane 5, isolate MOD-1; lane 6, isolate MOD-2; lane 7, isolate MOD-3; lane 8, isolate MOD-5; lane 9, isolate MOD-6.
