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Agarose gel electrophoresis of PCR products obtained under optimized conditions for identification of dominant LAB isolates (1500 bp). 100 bp DNA ladder (lane 2), extracted DNA from cultured cells of Lactobacillus spp. in MRS broth as positive control (lane 3), DNA extracted from single colonies of sourdough cultures (lane 4 and 5) and no DNA as negative control (lane 1).
