We thank past and present members of S.H.N.’s lab, P.R.A.’s lab, and the Division of Reproductive Sciences for discussion and helpful comments regarding the manuscript; Madeleine Carreau for providing Fanca+/− mice; Manuel Buchwald for providing Fancc+/− mice; Markus Grompe for providing Fancd2+/− mice; Junjie Chen for providing Mdc1+/− and Rnf8+/− mice; R. Daniel Camerini-Otero for Spo11+/− mice; the Fanconi Anemia Research Fund for the FANCM antibody; Alan D’Andrea for FANCD2 antibodies (G33 and E35); and Paula E. Cohen for the SLX4 antibody. Here, FANCD2 is linked to Fanconi anemia.