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Fig. 2. Neighbor-joining tree generated from microsatellite data analyzed with Nei's (1972) similarity coefficient. The labels (left to right) are the three-letter taxon code, accession number, and generalized geographic area corresponding to Table 1 and Fig. 1. The vertical lines T and A refer to clusters of subsp. tuberosum and subsp. andigenum, respectively. Asterisks (*) and number signs (#) highlight non-subsp. andigenum cultivated and wild species, respectively, that fall within the subsp. andigenum cluster. The three sets of brackets to the right highlight accessions tbr 72 and tbr 72 rr of replicated runs of the same DNA sample, and accessions adg 42(1) and 43(1), and 34(2) and 35(2), of pairs of the same accessions with DNA extracted from a separate individual grown from a separate seed of the same accession.
