3C8K:
reference: Molecular architecture of the major histocompatibility complex class I-binding site of Ly49 natural killer cell receptors., Deng L, Cho S, Malchiodi EL, Kerzic MC, Dam J, Mariuzza RA, J Biol Chem. 2008 Jun 13;283(24):16840-9. Epub 2008 Apr 21. PMID: 18426793

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