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StuI digests of PCR amplification products obtained from mixtures of P. ruminicola 23 and P. bryantii B14 cells, using the rBacPre-plus-fD1 primer combination. Lanes: 1 B14 DNA only; 11, 23 DNA only; 2 to 10 contained B14 and 23 cells in the ratios 9:1, 8:2, 7:3, 6:4, 5:5, 4:6, 3:7, 2:8, and 1:9, respectively.
