FIG. 1.

Cluster analysis of streptococcal polysaccharide biosynthetic loci. The relatedness of the loci was determined from the extent of sharing of HGs, adjusted for the percentage DNA sequence similarity between the genes encoding the shared HGs, as described in Materials and Methods. Clusters are defined by the dotted line at a distance of 0.3, and subclusters are defined by the dotted line at 0.05. Serotypes of S. pneumoniae (and S. agalactiae) or species of viridans group streptococci are shown at the end of each branch of the tree.