Fig. 4

Snapshot of gene distribution by their conservation in 14 S. pneumonia strains genomes. Gene distribution can be presented in three kinds of models: (a) According to the gene conservation level, the location of all genes were filled with gradient colors; (b) From pan-genome sight, all genes are classified into core genes, dispensable genes, and strains specific genes, and the locations of those three classes of genes are filled with three different colors; (c) All genes are classified into core genes, high conserved dispensable genes, low conserved genes, and strain specific genes, and the locations of those four classes genes are filled with four different colors. d Is the distribution of those strain specific genes