1ZI1:
reference: Differential recognition of the type-I and type-II H-antigen acceptors by the human ABO(H) blood group A and B glycosyltransferases., Letts JA, Rose NL, Fang YR, Barry CH, Borisova SN, Seto NO, Palcic MM, Evans SV, J Biol Chem 2005 Dec 2;. PMID: 16326711

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