This training session is organized by the bios4Biol CATI. Morning : phylogenomics The morning course will provide insigths about sampling problems in phylogenomics studies (genes, species) and methodological aspects of phylogenomics studies with two major focus on super-matrix and super-tree methods. Afternoon : selection pressure The afternoon course will be dedicated to the use of the PAML4 package in order to study selection pressures in a sequence alignment.