Xavier Altafaj1, Mara Dierssen, Carmela Baamonde, Eulàlia Martı́, Joana Visa, Jordi Guimerá, Marta Oset, Juan R. González, Jesús Flórez, Cristina Fillat, Xavier Estivill
1Down Syndrome Research Group, Medical and Molecular Genetics Center, IRO, Hospital Duran i Reynals, Gran Via s/n, Km 2.7, 08907-L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain.