Cell online: May 30, 2013 53BP1 mediates productive and mutagenic DNA repair through distinct phosphoprotein interactions Elsa Callen, Michela Di Virgilio, Michael J. Kruhlak, Maria Nieto-Soler, Nancy Wong, Hua-Tang Chen, Robert B. Faryabi, Federica Polato, Margarida Santos, Linda M. Starnes, Dua...