
Distribution of the 30-kb gene cluster encoding LPS biosynthesis proteins in the 249 strains studied. Red and black denote the presence and absence of genes, respectively. Dendrogram was obtained by hierarchical cluster analysis based on the presence and absence of genes. The two right columns indicate the presence of the respective genes among the 151 tested L. pneumophila Sg1 and the 61 non-Sg1 strains. (Orange) Genes present in all and only Sg1 strains.











