Binding to an HMG box domain, a protein domain that consists of three helices in an irregular array. HMG-box domains are found in one or more copies in HMG-box proteins, which form a large, diverse family involved in the regulation of DNA-dependent processes such as transcription, replication, and strand repair, all of which require the bending and unwinding of chromatin. [GOC:yaf, InterPro:IPR009071, PMID:18445004]
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C5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function