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Fig. 2. Unweighted pair-group method arithmetic average cluster analysis of genetic distances among seven Chinese soybean ecotypes using 60 SSR loci. Numbers at the branch points indicate support for groupings to the right of the number; values are a percentage of 1000 bootstrap datasets that exhibited the cluster. NEsp = Northeast Spring, Nsp = Northern Spring, Hsp = Huanghuai Valley Spring, Hsu = Huanghuai Valley Summer, Ssp = Southern Spring, Ssu = Southern Summer, Sau = Southern Autumn.