2JGS:
reference: Rational modification of ligand-binding preference of avidin by circular permutation and mutagenesis., Maatta JA, Airenne TT, Nordlund HR, Janis J, Paldanius TA, Vainiotalo P, Johnson MS, Kulomaa MS, Hytonen VP, Chembiochem. 2008 May 5;9(7):1124-35. PMID: 18381715

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