Gu J, Lu H, Tippin B, Shimazaki N, Goodman MF, Lieber MR.

EMBO J. 2007 Feb 21;26(4):1010-23. doi:10.1038/sj.emboj.7601559

XRCC4:DNA ligase IV can ligate incompatible DNA ends and can ligate across gaps.

Requires the Ku heterodimer.