2D3V:
reference: Crystal structure of the human monocyte-activating receptor, "Group 2" leukocyte Ig-like receptor A5 (LILRA5/LIR9/ILT11)., Shiroishi M, Kajikawa M, Kuroki K, Ose T, Kohda D, Maenaka K, J Biol Chem. 2006 Jul 14;281(28):19536-44. Epub 2006 May 3. PMID: 16675463

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