3GVL:
reference: Structural Basis for the Recognition and Cleavage of Polysialic Acid by the Bacteriophage K1F Tailspike Protein EndoNF., Schulz EC, Schwarzer D, Frank M, Stummeyer K, Muhlenhoff M, Dickmanns A, Gerardy-Schahn R, Ficner R, J Mol Biol. 2010 Mar 19;397(1):341-351. Epub 2010 Jan 22. PMID: 20096705

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