4QBB:
reference: Foot-and-mouth disease virus leader proteinase: Structural insights into the mechanism of intermolecular cleavage., Steinberger J, Grishkovskaya I, Cencic R, Juliano L, Juliano MA, Skern T, Virology. 2014 Sep 18;468-470C:397-408. doi: 10.1016/j.virol.2014.08.023. PMID: 25240326

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).