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Principal component scores for the tetraploid S. tuberosum-named varieties and landraces (•) and the landrace accession TBR3302 (2) (○), and for the diploid S. phureja accession PHU.4637 (X) and named cultivars Inca Sun (▴) and Mayan Gold (▪). Differences among the tetraploid S. tuberosum-named varieties and landraces were not equally clear.
