3FRO:
reference: Lyase activity of glycogen synthase: Is an elimination/addition mechanism a possible reaction pathway for retaining glycosyltransferases?, Diaz A, Diaz-Lobo M, Grados E, Guinovart JJ, Fita I, Ferrer JC, IUBMB Life. 2012 Jul;64(7):649-58. doi: 10.1002/iub.1048. Epub 2012 May 31. PMID: 22648728

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