it allows finding the species of origin of a DNA fragment with a fairly good efficiency. 2, 22 Note that because the genomic signature is stable along the genome, non-homolog fragments of species can be compared (homology is required for most other methods devoted to comparative genomics). Lastly, proximity between species in terms of genomic signature is known to be linked to evolutionary proximity. Indeed many phylogenies based on hierarchical classifications of signatures have been proposed. [23] [24] [25] [26] [27] [28] Another powerful approach to describe the taxonomic organisation of genomic signatures uses dimensionality reductions: data are embedded on a two-dimensional (or sometimes three-dimensional) space. These representations have been achieved by Principal Components Analysis (PCA), 2,3 by Self Organising Map (SOM) 29 or by Data-Driven High Dimensional Scaling (DD-HDS). 19 However, details of the spatial organisation of genomic signatures cannot be easily observed on a large dataset because of the limitation in term of discrete colors. In the following example we propose to visualise the taxonomic tree of species on the DD-HDS mapping of genomic signatures by means of the color code provided by ColorPhylo and Figure 7 .