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Two dimensional multidimensional scaling (MDS) plots of G. hirsutum groups. a improved type G. hirsutum samples from the United States and from other countries, and b improved type G. hirsutum samples from breeding regions in the United States. Identical by state genetic similarities of 185 G. hirsutum samples from the United States (eastern, 48; mid-south, 48; plains, 43; western, 12; n/a, 34) and 107 samples from other countries were used in generating the MDS plots
