1TVY:
reference: Effect of the Met344His mutation on the conformational dynamics of bovine beta-1,4-galactosyltransferase: crystal structure of the Met344His mutant in complex with chitobiose., Ramakrishnan B, Boeggeman E, Qasba PK, Biochemistry 2004 Oct 5;43(39):12513-22. PMID: 15449940

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