3M1H:
reference: The modular structure of haemagglutinin/adhesin regions in gingipains of Porphyromonas gingivalis., Li N, Yun P, Jeffries CM, Langley D, Gamsjaeger R, Church WB, Hunter N, Collyer CA, Mol Microbiol. 2011 Sep;81(5):1358-73. doi: 10.1111/j.1365-2958.2011.07768.x., Epub 2011 Aug 4. PMID: 21812842

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