Figure 2

Minimum spanning tree analysis. Minimum spanning tree analysis of MTs on the 118 strains from four ethnic groups was constructed. There're 3 kinds of lines, solid, thin and dotted, which represented single, double and triple or more loci variation respectively. The circles stand for strains, and different colors represent different ethnic groups. Strains from different ethic group could group together, esp. of strains from Tibetan.