3QRB:
reference: Molecular design principles underlying beta-strand swapping in the adhesive dimerization of cadherins., Vendome J, Posy S, Jin X, Bahna F, Ahlsen G, Shapiro L, Honig B, Nat Struct Mol Biol. 2011 Jun;18(6):693-700. doi: 10.1038/nsmb.2051. Epub 2011, May 15. PMID: 21572446

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