2OY3:
reference: Crystal structure of the cysteine-rich domain of scavenger receptor MARCO reveals the presence of a basic and an acidic cluster that both contribute to ligand recognition., Ojala JR, Pikkarainen T, Tuuttila A, Sandalova T, Tryggvason K, J Biol Chem. 2007 Jun 1;282(22):16654-66. Epub 2007 Apr 3. PMID: 17405873

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