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PCR products from proportional mixtures of P. ginseng (Pg) and P. quinquefolius (Pq) root slices. Dried root samples of P. ginseng and P. quinquefolius were mixed in the ratios of 10:1, 5:1, 2.5:1, 1:1, 1:2.5, 1:5, and 1:10, and DNA extracted from the mixed samples was used for PCR reactions using the co-dominant pgcpir035 marker. M indicates 100 bp DNA ladder. * The additional heteroduplex band that appeared in the mixed samples.
