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Population structure of 67 Galapagos tomato accessions based on SNP markers. (A) Principal component analysis (PCA) of SNP markers identified from 67 samples of S. galapagense, S. cheesmaniae, S. pimpinellifolium, and S. lycopersicum, where each species/taxon clusters together, except for two accessions (indicated by arrows). (B) STRUCTURE analysis with K = 3, each accession is represented by a single column, with the color indicating cluster membership.
