Acknowledgements

The authors of this study would like to thank Dídac Santesmasses and his colleagues that supported us during the informatic development of our project. Also thank to Roderic Guigó, Cédric Notredame, Robert Castelo, Toni Gabaldón and all our bioinformatic's teachers that where present in class sessions. We also want to thank to our classmates, who give us advice and help in all progress of this work. Finally we are specially thankful to our tutor Amadís Pages for all his support, councils and his constant presence.