5VCL:
reference: Crystal structure of Qa-1a with bound Qa-1 determinant modifier peptide., Ying G, Wang J, Kumar V, Zajonc DM, PLoS One. 2017 Aug 2;12(8):e0182296. doi: 10.1371/journal.pone.0182296., eCollection 2017. PMID: 28767728

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