A protein complex that plays a role in DNA double-strand break repair via nonhomologous end joining. Such complexes typically contain a specialized DNA ligase (e.g. Lig4 in eukaryotes) and one or more proteins that bind to DNA ends. [GOC:mah, PMID:17072889, PMID:17938628]
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C5: Ontology GO: Gene Ontology GO:CC: GO Cellular Component