4F9D:
reference: The structure- and metal-dependent activity of Escherichia coli PgaB provides insight into the partial de-N-acetylation of poly-beta-1,6-N-acetyl-D-glucosamine., Little DJ, Poloczek J, Whitney JC, Robinson H, Nitz M, Howell PL, J Biol Chem. 2012 Sep 7;287(37):31126-37. doi: 10.1074/jbc.M112.390005. Epub 2012, Jul 18. PMID: 22810235

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