The article discusses research being done on DNA damage repair. It references the study "Histone H1 couples initiation and amplification of ubiquitin signalling after DNA damage," by T. Thorslund and colleagues in 2015 issue of the journal "Nature." Results showed that the H1 linker histone at DNA double-strand breaks (DSBs) is an effective sensor of mediate Lys63 (K63) ubiquitylation and repair.