1R7A:
reference: Crystal structure of sucrose phosphorylase from Bifidobacterium adolescentis., Sprogoe D, van den Broek LA, Mirza O, Kastrup JS, Voragen AG, Gajhede M, Skov LK, Biochemistry 2004 Feb 10;43(5):1156-62. PMID: 14756551

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