Binding to a BH3 protein domain, present in Bcl-2 family members. The BH3 domain is a potent death domain and has an important role in protein-protein interactions and in cell death. [PMID:11048732, PMID:12133724, PMID:9020082, PMID:9704409, Prosite:PS01259]
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C5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function