Binding to an armadillo repeat domain, an approximately 40 amino acid long tandemly repeated sequence motif first identified in the Drosophila segment polarity protein armadillo. Arm-repeat proteins are involved in various processes, including intracellular signaling and cytoskeletal regulation. [GOC:BHF, GOC:mah, GOC:vk, InterPro:IPR000225]
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C5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function