3EWI:
reference: A C-terminal phosphatase module conserved in vertebrate CMP-sialic acid synthetases provides a tetramerization interface for the physiologically active enzyme., Oschlies M, Dickmanns A, Haselhorst T, Schaper W, Stummeyer K, Tiralongo J, Weinhold B, Gerardy-Schahn R, Itzstein MV, Ficner R, Munster-Kuhnel AK, J Mol Biol. 2009 Aug 7. PMID: 19666032

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