53BP1 cooperation with the REV7–shieldin complex underpins DNA structure-specific NHEJ by Ghezraoui, H, Oliveira, C, Becker, J, Bilham, K, Moralli, D, Anzilotti, C, Fischer, R, Deobagkar-Lele, M, Sanchiz-Calvo, M, Fueyo-Marcos, E, Bonham, S, Kessler, B, Rottenberg, S, Cornall, R, Green, C, Chapman, J