2GY7:
reference: Crystal structures of the Tie2 receptor ectodomain and the angiopoietin-2-Tie2 complex., Barton WA, Tzvetkova-Robev D, Miranda EP, Kolev MV, Rajashankar KR, Himanen JP, Nikolov DB, Nat Struct Mol Biol. 2006 Jun;13(6):524-532. Epub 2006 May 28. PMID: 16732286

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