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IS6110 RFLP patterns of different mixtures of the DNAs of two M. tuberculosis strains. Lanes 1 and 21 show the RFLP patterns of the pure DNAs of the two strains. Lanes 2 to 20 show the patterns of mixtures of the DNAs of these strains. The numbers in the second horizontal row indicate the ratios of the DNA mixtures. The numbers on the left indicate the sizes of standard DNA fragments in kilobase pairs.
