1R3A:
reference: Homology modeling studies on human galactose-1-phosphate uridylyltransferase and on its galactosemia-related mutant Q188R provide an explanation of molecular effects of the mutation on homo- and heterodimers., Marabotti A, Facchiano AM, J Med Chem. 2005 Feb 10;48(3):773-9. PMID: 15689161

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