4V3C:
reference: Complete switch from alpha-2,3- to alpha-2,6-regioselectivity in Pasteurella dagmatis beta-D-galactoside sialyltransferase by active-site redesign., Schmolzer K, Czabany T, Luley-Goedl C, Pavkov-Keller T, Ribitsch D, Schwab H, Gruber K, Weber H, Nidetzky B, Chem Commun (Camb). 2015 Feb 21;51(15):3083-6. doi: 10.1039/c4cc09772f. PMID: 25619424

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