3MLG:
reference: Structure and folding of a designed knotted protein., King NP, Jacobitz AW, Sawaya MR, Goldschmidt L, Yeates TO, Proc Natl Acad Sci U S A. 2010 Nov 30;107(48):20732-7. Epub 2010 Nov 10. PMID: 21068371

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