1Y52:
reference: High-resolution crystal structure of an avidin-related protein: insight into high-affinity biotin binding and protein stability., Eisenberg-Domovich Y, Hytonen VP, Wilchek M, Bayer EA, Kulomaa MS, Livnah O, Acta Crystallogr D Biol Crystallogr 2005 May;61(Pt 5):528-38. Epub 2005, Apr 20. PMID: 15858262

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