1VYO:
reference: Binding properties of HABA-type azo derivatives to avidin and avidin-related protein 4., Repo S, Paldanius TA, Hytonen VP, Nyholm TK, Halling KK, Huuskonen J, Pentikainen OT, Rissanen K, Slotte JP, Airenne TT, Salminen TA, Kulomaa MS, Johnson MS, Chem Biol. 2006 Oct;13(10):1029-39. PMID: 17052607

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