3MUY:
reference: Importance of Arg-599 of beta-galactosidase (Escherichia coli) as an anchor for the open conformations of Phe-601 and the active-site loop., Dugdale ML, Vance ML, Wheatley RW, Driedger MR, Nibber A, Tran A, Huber RE, Biochem Cell Biol. 2010 Dec;88(6):969-79. PMID: 21102659

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