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DGGE gels loaded with PCR products after amplification with ITSa primers of the rRNA ITS region for different mixtures of strain CYA43 and strain CYA140. (A) DGGE gel of strains CYA43 and CYA140 mixed in the following ratios (from left to right): 99:1, 5.67:1, 2.45:1, 1.33:1, 0.89:1, 0.59:1, 0.32:1, 0.14:1, and 0.01:1. (B) DGGE gel of competition experiment 2, in which the toxic strain CYA140 is gradually displaced by the nontoxic strain CYA43.
