Patterns of amplified PCR products, which were separated by agarose gel electrophoresis, from the mixed-culture cells. Names of the strains and size of PCR products are marked on the left side of the corresponding bands. The conditions under which the mixed cultures were grown are indicated on the right side. The numbers 0 to 6 refer to the number of times of subculturing. A, WTK and MatD1 mixed-culture. B, WTK and DoubleExt mixed-culture. C, WTK and DoubleExt mixed culture in the presence of DCMU and Glc.