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Official Full Name: annexin A9
Also known as: ANX31
Annexins are a class of calcium-dependent phospholipid-binding proteins. Members of the annexin family contain four internal repeat domains, each of which contains a type II calcium-binding site. Calcium-binding sites are required for annexin aggregation and cooperative binding of anionic phospholipids and extracellular matrix proteins. This gene encodes a different member of the annexin family in which all four homologous type II calcium-binding sites contain amino acid substitutions in the conserved tetrameric core that impair their function. However, structural analysis revealed that the conserved putative ion channel formed by the tetrad core is intact.