ACKNOWLEDGMENTS We would like to acknowledge the professors from the Bioinformatics Department for providing us with the knowledge to do this project: Roderic Guigó, Robert Castelo, Cedric Notredame and Toni Gabaldón. We would also like to thank our classroom mates for their support during all the hours spent together doing this project. Finally, we would like to express our gratitude to our supervisors, Miquel Àngel Schikora and Marina Lleal, as well as all the others tutors, for guiding us through the difficulties along the process. Thank you!