3PT5:
reference: Structural and enzymatic characterization of NanS (YjhS), a 9-O-acetyl N-acetylneuraminic acid esterase from escherichia coli O157:H7., Rangarajan ES, Ruane KM, Proteau A, Schrag JD, Valladares R, Gonzalez CF, Gilbert M, Yakunin AF, Cygler M, Protein Sci. 2011 May 6. doi: 10.1002/pro.649. PMID: 21557376

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