Multidimensional scaling ordination in three dimensions, based on Kruskal's method. The plot shows genetic relationships between anaerobic strains isolated from sediments of the lower Tiber basin. Genetic distances between the three clusters are clearly visible, as well as the incomplete homology between the environmental strains isolated (squares), and those previously published in GenBank (circles).
Marcheggiani et al. BMC Microbiology 2008 8:171 doi:10.1186/1471-2180-8-171