2H64:
reference: A silent H-bond can be mutationally activated for high-affinity interaction of BMP-2 and activin type IIB receptor., Weber D, Kotzsch A, Nickel J, Harth S, Seher A, Mueller U, Sebald W, Mueller TD, BMC Struct Biol. 2007 Feb 12;7:6. PMID: 17295905

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