Minimum Spanning Trees for Selected Clusters. Plates a-f present minimum spanning trees for selected putative clusters that contain more than two sequenced isolates. These clusters are discussed individually in following sections. Isolates are identified by their University of Hawaii DNA extraction numbers. The number of SNPs separating each isolate or group of isolates is shown next to each connecting line. Trees shown were determined by PHYLOViZ 2.0 using goeBURST Full MST.