3UBG:
reference: Crystal structures of Drosophila N-cadherin ectodomain regions reveal a widely used class of Ca2+-free interdomain linkers., Jin X, Walker MA, Felsovalyi K, Vendome J, Bahna F, Mannepalli S, Cosmanescu F, Ahlsen G, Honig B, Shapiro L, Proc Natl Acad Sci U S A. 2011 Dec 14. PMID: 22171007

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