Armadillo repeats
Armadillo repeats are named after the β-catenin-like Armadillo protein of the fruit fly Drosophila.[2] These repeats are about 40 amino acids long and proteins that contain them have many tandemly repeated copies.[3][4] Each Armadillo repeat is composed of a pair of alpha helices that form a hairpin structure. Multiple copies of the repeat form what is known as an alpha solenoid structure. β-catenin is a protein involved in linking cadherin cell adhesion proteins to the cytoskeleton[1], but the Armadillo repeat is found in a wide range of proteins with other functions. This type of protein domain is important in transducing WNT signals during embryonic development.
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