4R9J:
reference: Human ficolin-2 recognition versatility extended: An update on the binding of ficolin-2 to sulfated/phosphated carbohydrates., Laffly E, Lacroix M, Martin L, Vassal-Stermann E, Thielens NM, Gaboriaud C, FEBS Lett. 2014 Dec 20;588(24):4694-700. doi: 10.1016/j.febslet.2014.10.042. Epub, 2014 Nov 11. PMID: 25447524

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uses Jmol, developed by the Jmol Development Team (documentation).