3I0F:
reference: Cysteine-to-serine mutants dramatically reorder the active site of human ABO(H) blood group B glycosyltransferase without affecting activity: structural insights into cooperative substrate binding., Schuman B, Persson M, Landry RC, Polakowski R, Weadge JT, Seto NO, Borisova SN, Palcic MM, Evans SV, J Mol Biol. 2010 Sep 17;402(2):399-411. Epub 2010 Jul 23. PMID: 20655926

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