Identification of Early Replicating Fragile Sites that Contribute to Genome Instability Jacqueline H. Barlow, Robert B. Faryabi, Elsa Callén, Nancy Wong, Amy Malhowski, Hua Tang Chen, Gustavo Gutierrez-Cruz, Hong-Wei Sun, Peter McKinnon, George Wright, Rafael Casellas, Davide F. Robbiani, Louis Staudt, Oscar Fernandez-Capetillo, André Nussenzweig Cell, Volume 152, Issue 3, 620-632, 24 January 2013